GSG GMH 3750 Manuale utente

H49.0.02.6C-04

Operating Manual Precision Thermometer

GMH 3750

from Version 1.0

For Pt100 4-Wire Temperature Probes

H49.0.02.6C-04 Operating Manual GMH 3750 Page 2

Index

1 IN GENERAL.............................................................................................................................................................................2

1.1 SAFETY INSTRUCTIONS .........................................................................................................................................................2

1.2 OPERATING AND MAINTENANCE ..........................................................................................................................................3

1.3 CONNECTIONS.......................................................................................................................................................................3

1.4 DISPLAY ELEMENTS ..............................................................................................................................................................3

1.5 PUSHBUTTONS ......................................................................................................................................................................3

2 DEVICE CONFIGURATION...................................................................................................................................................4

3 SOME BASICS OF PRECISION TEMPERATURE MEASURING....................................................................................5

4 SPECIAL FUNCTIONS ............................................................................................................................................................6

4.1 DISPLAY RESOLUTION...........................................................................................................................................................6

4.2 USER SENSOR CURVE ('LIN USER') ......................................................................................................................................6

4.3 ZERO DISPLACEMENT ('OFFSET')...........................................................................................................................................6

4.4 SCALE CORRECTION ('SCALE') ..............................................................................................................................................6

4.5 OUTPUT.................................................................................................................................................................................6

4.5.1 Interface - Base Address ('Adr.') ..................................................................................................................................6

4.5.2 Analogue Output – Scaling with DAC.0 and DAC.1....................................................................................................7

4.6 ALARM..................................................................................................................................................................................7

4.7 REAL TIME CLOCK ................................................................................................................................................................7

5 OPERATION OF LOGGER.....................................................................................................................................................8

5.1 „FUNC-STOR“: STORING SINGLE MEASUREMENTS................................................................................................................8

5.2 „FUNC-CYCL“: AUTOMATIC RECORDING WITH SELECTABLE LOGGER-CYCLE-TIME ..........................................................9

6 FAULT AND SYSTEM MESSAGES.....................................................................................................................................10

7 PROBE PIN ASSIGNMENT ..................................................................................................................................................10

8 CALIBRATION SERVICES ..................................................................................................................................................10

9 TECHNICAL DATA ...............................................................................................................................................................11

10 DISPOSAL NOTES ................................................................................................................................................................11

1 In General

1.1 Safety Instructions

This device has been designed and tested in accordance to the safety regulations for electronic devices.

However, its trouble-free operation and reliability cannot be guaranteed unless the standard safety measures and special safety advises given in

this manual will be adhered to when using it.

1. Trouble-free operation and reliability of the device can only be guaranteed if it is not subjected to any other climatic conditions than those

stated under “Specification”.

2. Transporting the device from a cold to a warm environment condensation may result in a failure of the function. In such a case make sure the

device temperature has adjusted to the ambient temperature before trying a new start-up.

3. The circuitry has to be designed most carefully if the device should be connected to other devices. Internal connection in third party devices

(e.g. connection GND and earth) may result in not-permissible voltages impairing or destroying the device or another device connected.

4. Warning: Operating the device with a defective mains power supply (e.g. short circuit from mains voltage to output voltage) may result in

hazardous voltages at the device (e.g. at sensor socket)

5. Whenever there may be a risk whatsoever involved in running it, the device has to be switched off immediately and to be marked accordingly

to avoid re-starting. Operator safety may be a risk if:

•there is visible damage to the device

•the device is not working as specified

•the device has been stored under unsuitable conditions for a longer time

In case of doubt, please return device to manufacturer for repair or maintenance.

6. Warning: Do not use these product as safety or emergency stop device, or in any other application where failure of the product could result in

personal injury or material damage.

Failure to comply with these instructions could result in death or serious injury and material damage.

H49.0.02.6C-04 Operating Manual GMH 3750 Page 3

1.2 Operating And Maintenance

•Battery Operation

The battery has been used up and needs to be replaced, if and „bAt“ are shown in lower display.

The device will, however, continue operating correctly for a certain time.

The battery has been completely used up, if ´bAt´ is shown in the upper display.

The battery has to be taken out, when storing device above 50°C.

Hint: We recommend to remove the battery if device is not used for a longer period of time!

•Mains Operation

Attention: When using a power supply unit please note that operating voltage has to be 10.5 to 12 V DC. Do not

apply overvoltage!! Simple 12V-power supplies often have excessive no-load voltage. We, therefore, recommend

using regulated voltage power supplies. Trouble-free operation is guaranteed by our power supply GNG10/3000.

Prior to connecting the plug power supply with the mains supply make sure that the operating voltage stated at the

power supply is identical to the mains voltage.

•Treat device and probes carefully. Use only in accordance with above specification. (do not throw, hit against etc.).

Protect plugs and sockets from soiling.

•To disconnect sensor plug do not pull at the cable but at the plug.

•When connecting the probe the plug will slide in smoothly if plug is entered correctly.

•Selection of Output-Mode: The output can be used as serial interface or as analogue output. This choice has to

be done in the configuration menu.

1.3 Connections

1. Output: Operation as interface: Connect to optically isolated

interface adapter (accessory: GRS 3100 or GRS3105)

Operation as analogue output: Connection via suitable cable.

Attention: The output mode has to be configured (p.r.t. 2.7) and

influences battery life!

2. Probe connection Pt100 4-wire

3. The mains socket is located at the left side of the instrument

1.4 Display Elements

1 = Main Display: Currently measured temperature

2 = Auxiliary

Display:

Display of min, max or hold values

Special display elements:

3 = Warning

triangle:

indicates a low battery

4 = Corr-arrow:indicates that correction factor is activated

5 = Offset-arrow:indicates that zero point offset (offset) is activated

6 = Min/Max/Hold:shows if a min., max. or hold value is displayed in

the secondary display

7 = Alarm-arrow:Flashes if alarm is present

8 = Logg-arrow:Shown if logger function is selected,

flashes if cyclic logger is running

1.5 Pushbuttons

key 1: On/Off key

key 4: Set/Menu

press (Menu) for 2 sec.: configuration will activated

keys 2, 5: min/max when taking measurements:

press shortly: min. or max. measuring value will be displayed

press for 2 sec.: the min. or max. value will be deleted

up/down for configuration:

to enter values or change settings

key 6: Store/Quit

- Measurement: Hold current measuring value ('HLD' in display) or

operation of logger functions (p.r.t. Chapter 5)

- Menu: Acknowledge setting, return to measuring

key 3: When taking measurements: no function

During configuration: Selection of menu-parameter

H49.0.02.6C-04 Operating Manual GMH 3750 Page 4

2 Device Configuration

Note: Some menu items will be shown depending on the actual device configuration (e.g. there are some

items disabled when the logger contains data). Please note the hints by the menu items.

For configuration of the device press "Menu"-key (key 4) for 2 seconds, the main menu will be shown (main display:

“SEt”). Choose the desired menu branch by pressing the "Menu"-key (key 4). By pressing “4” (key 3) the referring

parameters can be chosen. The referring values are changed by pressing the keys "5" (key 2) or "6" (key 5) (Choice

of parameter: “4”). Pressing “Menu” (key 4) again will jump back to the main menu selection and stores the settings.

Use key "Quit" (key 6) to leave configuration.

Menu Parameter Values Meaning

key Menu key4key5or 6p.r.t.

Set Configuration: Generic Settings

°C: All temperature values are in degrees Celsius

°F: All temperature values are in degrees Fahrenheit

0.1°: Resolution 0.1°C

0.01°: Resolution 0.01°C

Auto: Resolution is selected automatically

*4.1

E.751 Measuring / sensor curve according to EN60751

USEr User sensor curve (Predefined to EN60751 values, changeable by

software GMHKonfig)

*4.2

-2.50°C..2.50°C resp.

-4.50°F...4.50°F

The zero point of the measurement will be displaced by this value to

compensate for deviations in the probe or in the measuring device.

oFF: Zero displacement inactive (=0.0°)

*4.3

-2.000...2.000: The scale of the measuring will be changed by this factor (in %) to

compensate deviations of temperature probe or measuring device

oFF: Scale correction factor inactive (=0.000)

*4.4

1...120 Power-off delay in minutes.

Device will be automatically switched off as soon as this time has

elapsed if no key is pressed/no interface communication takes place

oFF Power-off function inactive (continuous operation, e.g. mains operation)

oFF: Function of the output: No output function, lowest power consumption

SEr: Output is serial interface

dAC: Output is analogue output 0...1V

4.5

01,11..91 Base Address when Output = Serial Interface :

Base address of device for interface communication. 4.5.1

-200.0...850.0°C resp.

-328.0...1562.0°F

Enter desired temperature value at which the analogue output potential

should be 0V 4.5.2

-200.0...850.0°C resp.

-328.0...1562.0°F

Enter desired temperature value at which the analogue output potential

should be 1V 4.5.2

Set Alarm: Settin

s Of Alarm Function

on Alarm on, with horn-sound

no.So Alarm on, without horn-sound

oFF no alarm function

min range

...AL.Hi

Min alarm rail (not when AL. oFF)

AL.Lo

...max range

Max alarm rail (not when AL. oFF)

4.6

Set Logger: Configuration Of Logger Function *

CYCL Cyclic: logger function ‚cyclic logger‘

Stor Store: logger function ‚individual value logger‘

oFF no logger function

0:01..60:00 Cycle time of cyclic logger [minutes:seconds] *5.2

Set Clock: Setting Of Real Time Clock

HH:MM Clock: Setting of time hours:minutes

YYYY Year

TT.MM Date: day.month

4.7

Hint: The settings will be set to the settings ex works, if keys ‘Set‘ and ‘Store‘ are pressed simultaneously

for more than 2 seconds.

(*) If the logger memory contains data already, the menus/parameters marked with (*) can not be invoked!

If these should be altered the logger memory has to be cleared before!

H49.0.02.6C-04 Operating Manual GMH 3750 Page 5

3 Some Basics Of Precision Temperature Measuring

•Probe Precision/Device Precision

The device is very precise (please refer to technical data). To be able to use this high precision, the connected temperature

probe has to be as precise as possible, too. The following precision classes are available as a standard at reasonable prices

(Platinum resistor thermometers according to EN60751):

Class Error ranges

B ± (0,3 + 0,005 • |temperature|)

1/3 B (=1/3 DIN) ± (0,1 + 0,0017 |temperature|)

1/10 B (=1/10 DIN) ± (0,03 + 0,0005 • |temperature|)

A ± (0,15 + 0,002 • |temperature|)

error of device and probe

-200 0 200 400 600 800

T [°C]

error [°C]

1/3B

1/10B

GMH37xx

error of device and probe

0,2

0,4

0,6

0,8

1,2

-50 0 50 100 150

T [°C]

error [°C]

1/3B

1/10B

GMH37xx

Error over measuring range Pt100 Error over range –50...150°C Pt100

For applications demanding higher precision than given by this classes we suggest to adjust the device to the used probe or to

get a calibration certificate for the device combined with the probe.

Attention: if an adjusted or calibrated probe is replaced, also the adjustment or calibration certificate has to be renewed to

maintain the referring overall precision!

Be careful when buying third party temperature probes: Besides the standard EN60751 there are some other obsolete or

unusual standards on the market. If such a probe has to be connected, the user sensor curve (have a look to the referring

chapter) can be used to adjust the instrument!

•4-Wire-Measuring

When using resistance thermometers as the Pt100 a quite large measuring error can be caused by inadequate cables and

connections. Using 4wire measuring avoids this kinds of errors mainly caused by unwanted resistances. It is suggested to use

suitable probes and extensions only. (For pin assignment please refer to chapter 7)

•Heat loss caused by probe construction:

Especially when measuring temperatures which deviate very much from the ambient temperature, measuring errors often occur

if the heat loss caused by the probe is not considered. When measuring fluids therefore the probe should be emerged

sufficiently deep and be stirred continuously. When measuring gases the probe should also emerge as deep as possible in the

gas to be measured (e.g. when measuring in channel/pipes) and the gas should flow around the probe at sufficient flow.

•Measuring Surface Temperature

If temperature of the surface of an object has to be measured, one should pay attention especially when measuring hot (or very

cold) surfaces, that the ambient air cools (or heats) the surface. Additionally the object will be cooled (or heated) by the probe

or the probe can have a better heat flow to the ambient temperature as to the objects surface.

Therefore specially designed surface probes should be used. The measuring precision depends mainly on he construction of

the probe and of the physics of the surface itself. If selecting a probe try to choose one with low mass and heat flow from

sensor to handle. Thermally conductive paste can increase the precision in some cases.

•Allowable temperature Range Of Probes

Pt100 Sensors are defined over a wide temperature range. Depending on probe materials and sort of sensor (e.g. hybrid

sensors, wire wound resistors...) the allowable temperature ranges have to be considered. Exceeding the ranges at least

causes a wrong measuring, it may even damage the probe permanently!

Often it also has to be considered, that the temperature range is just valid for the probe tube, (plastic-) handles can’t stand the

same high temperatures. Therefore the tube length should be selected long enough, that temperature keeps low at the handle.

•Self Heating

The measuring current of the instrument is just 0.3mA. Because of this comparably low current practically now self heating

effect has to be considered, even at air with low movement the self heating is <= 0.01°C.

•Cooling by Evaporation

When measuring air temperature the probe has to be dry. Otherwise the cold due to the evaporation causes too low

measurings.

H49.0.02.6C-04 Operating Manual GMH 3750 Page 6

4 Special Functions

4.1 Display Resolution

Standard setting: 'Auto', i.e. the device automatically switches over to the optimum resolution between .01° and 0.01°.

If temperatures to be measured are near the switching threshold, a fixed resolution may be better, e.g. for easy

recording. In such a case please select the optimum resolution manually.

4.2 User Sensor Curve ('Lin USEr')

By means of this function besides the standard conversion of resistance to temperature following EN60751(Lin E.751)

also other curves can be used. The user sensor curve can be read and edited by the configuration software

GMHKONFIG. The standard setting ex works is also set to the EN60751 data. The curve is defined by a table with two

columns (input resistance[Ohm]/output temperature [°C]) with 50 rows.

Info: the sensor curve following EN60751 uses the international temperature scale ITS90 and following formulas:

Temperatures < 0°C: Rneg(T) := 100 · [1 + 3.9083·10-3·T – 5.775·10-7·T2 – 4.183·10-12·(T – 100)·T3]

Temperatures >= 0°C: Rpos(T) := 100 · (1 + 3.9083·10-3·T – 5.775·10-7·T2)

Please notice: temperature measurements with the user sensor curve are allowed only within the temperature range

which has been used to generate the user sensor curve. Temperature measurements with an user sensor curve beyond

the checked temperature range can possibly lead to tremendous errors. Therefore the sensor curve due to DIN EN

60751 (display: Lin E.751) has to be used for temperature measurements beyond the checked temperature range.

4.3 Zero Displacement ('Offset')

A zero displacement can be carried out for the measured temperature:

temperature displayed = temperature measured - offset

Standard setting: 'off' = 0.0°, i.e. no zero displacement will be carried out. Together with the scale correction (see

below) this factor is mainly used to compensate for sensor deviations. Unless the factor is set to 'off', the offset arrow in

the display shows an active zero displacement.

4.4 Scale Correction ('Scale')

The scale of the measuring can be influenced by this setting (factor is in %):

displayed temperature[°C] = measured temperature[°C] * (1+Scal/100)

respectively displayed temperature[°F] = (measured temperature [°F]-32°F) * (1+Scal/100) + 32°F

Standard setting: 'off' =0.000, i.e. temperature is nor corrected. Together with the zero displacement (see above) this

factor is mainly used to compensate for sensor deviations.

Unless the factor is set to 'off', the Corr arrow in the display shows an active scale correction.

4.5 Output

The output can be used as serial interface (for GRS3100 or GRS3105 interface adapters) or as analogue output (0-

1V). If none of both is needed, we suggest to switch the output off, because battery life then is extended.

4.5.1 Interface - Base Address ('Adr.')

By using an electrically isolated interface converter GRS3100 or GRS3105 (accessory) the device can be connected to

a PC. With the GRS3105 it is possible to connect up to 5 instruments to a single interface (please also refer to

GRS3105-manual). As a precondition the base addresses of all devices must not be identical. In case several devices

will be connected via one interface make sure to configure the base addresses accordingly. In order to avoid

transmission errors, there are several security checks implemented (e.g. CRC).

The following standard software packages are available for data transfer:

!EBS9M: 9-channel software to record and display the measuring values

!EASYControl: Universal multi-channel software (EASYBUS-, RS485-, and/or GMH3000- operation possible)

for real-time recording and presentation of measuring data in the ACCESS®-data base format.

In case you want to develop your own software we offer a GMH3000-development package including

- an universally applicable 32bit Windows functions library ('GMH3000.DLL') with documentation that can be used by

all 'serious' programming languages.

- Programming examples for Visual Basic 6.0™, Delphi 1.0™, Testpoint™, Labview™

Note: The measuring and range values read via interface are always in the selected display

unit (°C/°F)!

H49.0.02.6C-04 Operating Manual GMH 3750 Page 7

Supported interface functions:

Code Name/Function Code Name/Function

0 read nominal value 200 read min. display range

3 read system status 201 read max. display range

6 read min. value 202 read unit of display

7 read max. value 204 read decimal point of display

12 read ID-no. 208 read channel count

22 read min. alarm rail (AL. - AL.Lo) 214 read scale correction

23 read max. alarm rail (AL. - AL.Hi) 215 set scale correction

216 read zero displacement

217 set zero displacement32

read configuration flag

alarm function: 1; Alarm horn:3;

BitLoggerOn:50; BitCyclicLogger:51; 224 Logger: read data cyclic logger

102 set min. alarm rail (AL. - AL.Lo) 225 Logger: read cycle time (LoGG - CYCL)

103 set max. alarm rail (AL. - AL.Hi) 226 Logger: set cycle time (LoGG - CYCL)

160 set configuration flag (see 32) 227 Logger: start recording

174 delete min. value 228 Logger: read #of data

175 delete max. value 229 Logger: read status

176 read min measuring range 231 Logger: read stop time

177 read max measuring range 233 read Real time clock (CLOC)

178 read measuring range unit 234 set Real time clock (CLOC)

179 read measuring range decimal point 236 Read logger memory size

180 read measuring type 240 Reset

194 set display unit 254 read program identification

199 read meas. type in display 260 Logger: read data manual logger

4.5.2 Analogue Output – Scaling with DAC.0 and DAC.1

With the DAC.0 and DAC.1 values the output can be rapidly scaled to Your efforts.

Keep in mind not to connect low-resistive loads to the output, otherwise the output value will be wrong and battery life is

decreased. Loads above ca 10kOhm are uncritical.

If the display exceeds the value set by DAC.1, then the device will apply 1V to the output

If the display falls below the value set by DAC.0, then the device will apply 0V to the output

In case of an error (Err.1, Err.2, no sensor, etc.) the device will apply slightly above 1V to the output.

GND

plug wiring::

+Uout

Attention!

The 3rd contact has to be left floating!

Only stereo plugs are allowed!

4.6 Alarm

There are three possible settings: Alarm off (AL. oFF), on with horn sound (AL. on), on without horn sound (AL. no.So).

Following conditions will display an alarm, when the function is activated (on or no.So):

-Value is below lower (AL. Lo) or above upper alarm rail (AL.Hi).

-Sensor error

-Low battery (bAt)

-Err.7: System error (always with sound)

In case of an alarm and when polling the interface the prio-flag is set in the returned interface message.

4.7 Real Time Clock

The real time clock is used for the logger function: Recorded values are also containing the point of time, when they

were measured. Please check the settings when necessary.

If the battery was replaced the referring menu ‚CLOC‘ will automatically be started.

H49.0.02.6C-04 Operating Manual GMH 3750 Page 8

5 Operation Of Logger

The device supports two different logger functions:

„Func-Stor“: each time when „store“ (key 6) is pressed a measurement will be recorded.

„Func-CYCL“: measurements will automatically be recorded at each interval, which was set in the logger menu

‚CYCL‘ until the logger will be stopped or the logger memory is full. The recording is started by

pressing „Store“ 2 seconds.

The logger records 1 measurement result each time

For the evaluation of the data the software GSOFT3050 (V1.7 or higher) has to be used. The software also allows easy

configuration and starting of the logger.

When the logger is activated (Func Stor or Func CYCL) the hold function is no longer available, key 6 is solely used for

the operation of the logger functions.

5.1 „Func-Stor“: Storing Single Measurements

Each time when „store“ (key 6) is pressed a measurement and its time stamp will be recorded.

The recorded data can be viewed either in the display (when calling the configuration an additional menu „REAd LoGG“

is displayed, see below) or by means of the interface and a PC with GSOFT3050-software.

Max. number of measurings: 99

A measuring contains: - current measuring value at the time of recording

- time and date of the recording

After each recording „St. XX“ will be displayed for a short time. XX represents the number of the recording.

When logger memory contains recordings already:

When „Store“ is pressed for 2 seconds, the choice for clearing the logger memory will be displayed:

The selection can be made by 5(key 2) and 6(key 5). "Quit" (key 6) enters the choice.

If the logger memory is full, the display will show:

Viewing Recorded Measurings

Within the „LoGG Stor“ function the measurings can be viewed directly in the display not only by means of a computer

(like at „Func CYCL“): press 2 seconds „Set“ (key 4): The first menu displayed now is „rEAd LoGG“ (read logger data).

After pressing 4(key 3) the measurement recorded last will be displayed, changing between the different data

referring to the measurement also is done by pressing 4.

Changing the measurement is done by pressing the keys 5or 6.

Clear all

recordings

Clear the last

recording

Clear nothing

(cancel menu)

H49.0.02.6C-04 Operating Manual GMH 3750 Page 9

5.2 „Func-CYCL“: Automatic Recording With Selectable Logger-Cycle-Time

The Logger-Cycle-Time is selectable (p.r.t. Configuration). For example „CYCL“ = 1:00: A measuring is recorded after

each 60 seconds.

Max. number of measurings: 16384

Cycle time: 0:01...60:00 (minutes:seconds, min 1s, max 1h), selectable in the configuration

A measuring contains: - current measuring value at the time of recording

Starting a recording:

By pressing "Store" (key 6) for 2 seconds the recording will be initiated. After that the display shows ‘St.XXXXX‘ for a

short time whenever a measuring is recorded. XXXXX is the number of the measuring 1..16384.

If the logger memory is full, the display will show:

The recording automatically will be stopped.

Stopping the recording manually:

By pressing "Store" (key 6) the recording can be stopped manually. Then the following choice appears:

The selection can be made by 5(key 2) and 6(key 5). "Quit" (key 6) enters the choice.

Note: If you try to switch off the instrument in the cyclic recording operation You will be

asked once again if the recording should be stopped.

The device can only be switched off after the recording has been stopped!

The Auto-Power-Off-function is deactivated during recording!

Clear Recordings:

When „Store“ is pressed for 2 seconds, the choice for clearing the logger memory will be displayed:

The selection can be made by 5(key 2) and 6(key 5). "Quit" (key 6) enters the choice.

Stop the

recording

Do not stop the

recording

Clear all

recordings

Clear nothing

(cancel menu)

H49.0.02.6C-04 Operating Manual GMH 3750 Page 10

6 Fault and System Messages

Display Meaning Remedy

low battery voltage, device will continue to work for a short

time

replace battery

If mains operation: wrong voltage replace power supply, if fault continues to

exist: device damaged

low battery voltage replace battery

If mains operation: wrong voltage Check/replace power supply, if fault continues

to exist: device damaged

low battery voltage replace battery

If mains operation: wrong voltage Check/replace power supply, if fault continues

to exist: device damaged

system error Disconnect battery or power supply, wait

some time, re-connect

No display

weird display

Device does not

react on keypress device defective return to manufacturer for repair

Sensor error: no sensor connected Connect sensor to socket----

sensor/cable or device defective return to manufacturer for repair

Value exceeding measuring range Check: Is the value exceeding the measuring

range specified? ->temperature too high!

Wrong probe connected Check probe

Err.1

sensor/cable defective -> replace

Value below display range Check: Is the value below the measuring

range specified? -> temperature too low!

Wrong probe connected Check probe

Err.2

sensor/cable defective -> replace

Err.3 Value exceeding display range -> set resolution to 0.1° or Auto

Err.4 Value below display range -> set resolution to 0.1° or Auto

Err.7 system error return to manufacturer for repair

7 Probe pin assignment

The device is constructed for the connection of a Pt100 4-wire probe. The connection is be carried out as follows:

figure shows view upon probe jack pins

It is also possible to connect an 3- or 2-wire probe to the device. Please observe that in consequence of the cable

resistance a increased measuring fault will occur.

The connection of this probes should be carried out as follows:

3-wire connection 2- wire connection

8 Calibration Services

Calibration certificates can be issued by the factory. For this the device has to be sent to the manufacturer. Just the

manufacturer can check the factory settings and correct them if necessary.

Pt100

Pt100 Pt100

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