Labfacility Tempmaster PRO Manuale utente

Tempmaster PRO High Precision

Digital Thermometer / Logger

for Pt100 Sensors

User Manual

www.labfacility.co.uk

RoHS compliant

Certificate No. 4746

Contents

1. About the Tempmaster PRO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

a. Supply Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

b. Communication Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

c. Sensor Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3. Stand Alone Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

a. To read sensor temperature directly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

b. To read differential temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

c. Matching Tempmaster PRO to calibrated sensors . . . . . . . . . . . . . . . . . . . . . . . . . 10

d. SMART probe operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

e. Temperature measurement with calibrated sensor . . . . . . . . . . . . . . . . . . . . . . . . 11

f. Using Tempmaster PRO to obtain a secondary sensor calibration. . . . . . . . . . . . 12

g. On-board logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

h. Error indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

i. 3 or 4 wire recognition (Pt100) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

j. Variable filter rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4. Operation with a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

a. Install the software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

b. Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

c. Sensor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

d. Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

e. Input channel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

f. Units and resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

g. Coefficients and corrections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

h. Custom coefficients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

i. SMART probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

j. Log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

k. Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5. Analogue D to A output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6. Instrument Re-Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7. Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Information in this publication may be subject to change; the Tempmaster PRO is a micro-

processor based, software driven instrument and may therefore be subject to software

and hardware changes in line with our policy of continuous product development.

Tempmaster PRO Thermometer

1. About the Tempmaster PRO

The Tempmaster PRO is a successor to the very successful Tempmaster-100

thermometer developed over a 25 year period. Like its predecessor, the Tempmaster

PRO provides laboratory standard temperature measurement with Pt100 sensors and

greater versatility to extend the scope of applications.

Displayed values and user information are indicated on a bright clear OLED screen

with diffused backlighting. Data can be displayed in °C,°F,K,Ωas required; nine front

panel push keys, the only user controls, are used in conjunction with the display

screen. It is this arrangement which makes for very simple and “friendly” operation.

Resolution is 0.01°C: all computations are performed digitally without drift. Overall

stability is optimised by utilising only the highest quality components including high

precision, expensive metal film resistor networks.

There are two input ports for 3 or 4 wire Pt100 sensors; the instrument automatically

recognises 3 or 4 wire configurations.The measured temperature can be displayed

directly from one of the inputs or differentially between the two inputs. Differential

temperature and the two individual channel temperatures are displayed simultaneously.

Individual calibrated sensors can have their appropriate calibration values programmed

into the Tempmaster PRO using either the keypad or the PC software supplied.The PC

software also allows corrections in the form of constants for individual Pt100 sensors

to be programmed in.The non-volatile memory ensures that the values are retained

(until such time as they are changed) even after switch-off.Where the calibration

certificate relating to a particular probe states specific Ωvalues at stated

temperatures, up to ten such values are entered into the Tempmaster PRO with their

relevant temperature points using the front panel keypad or the software.The

instrument then digitally

self-calibrates to the associated probe over the range embraced in the calibrated

values used; the temperature readout is “corrected” accordingly.Additional manual

procedures are not required to compute precise temperature readings since these are

displayed directly; miscalculation errors are thus eliminated.Very high system

accuracies, better than 40 milliKelvins can be achieved using probe matching.

Corrections which are “programmed in” can be displayed for confirmation. However,

initial input, adjustment, enabling and disabling of corrections are protected For by a

special key sequence to prevent accidental or unauthorised changes.Values can be

changed by an authorised user at any time.

Tempmaster PRO Thermometer

For the Pt100 inputs,SMART probes can be used which incorporate dedicated

‘correction values‘ within the connector of each probe.When a SMART probe is

connected to input A or B or both inputs, the corrections are automatically applied

without the need for user intervention.

A common application for the Tempmaster PRO is the comparison calibration of

“working” sensors against a calibrated reference standard or semi-standard sensor. For

example, the sensor under test in channel B is compared against the reference sensor

(with programmed corrections) in channel A.

When applied, the null function corrects the differential temperature readout between

two sensors to zero. For example, the apparent temperature difference between two

sensors known to be at the same actual temperature can be corrected to zero prior

to, for example, heat exchanger experiments.

Both inputs can be scanned and values logged according to parameters set up by the

user in the PC software;the instrument incorporates a real-time clock and on-board

memory.

The adjustable contrast OLED display screen provides data readout, user prompts and

mode annunciation.This very important feature ensures a high degree of user

friendliness and confidence. User prompts indicate which buttons to press in the

appropriate sequence when selecting parameters and functions and when setting

calibration values. Mode annunciation indicates which mode of operation is currently

selected.

A flash drive USB port is provided to allow data to be stored and/or exported.

Firmware update are also facilitated via this port.

PC software running in WINDOWS is provided as standard; it allows programming of

custom calibration, remote control & measure and logging functions.

Tempmaster PRO Thermometer

2. Installation

The instrument is for bench-top and portable use, folding ‘legs’ can be extended to

provide a convenient viewing angle.

All connections are made to the rear panel as indicated.

2a Supply Connection

Refer to the rear panel illustration. Primary power is provided by the internal

Lithium Ion battery which provides up to 12 hours of operation from a full

charge.The external 90 to 260V 50/60Hz power supply allows recharging and

continuous operation.The output lead with its fitted connector is plugged in to

the rear panel socket ‘DC in 5V IA’.

Pressing the front panel ‘POWER’ key switches the instrument on / off.

The battery charge indicator in the top right of the display indicates the state of

charge.The battery will charge whenever the instrument is connected to the

power adaptor.

Tempmaster PRO Thermometer

Pt100 input

Channel A

USB

Communications

Flash

Drive

Supply

Connection

Analogue output

Pt100 input

Channel B

2b Communications Interface

Connect the USB cable supplied between the instrument and the PC. Refer to

the rear panel illustration.

2c Input Connection – Sensors

Refer to the rear panel illustration.

Pt100 sensors

Platinum resistance thermometers must be fitted with a high quality D-plug and

connected to input PRT-A and/or PRT-B as required.A 3 or 4 wire configuration

can be used but they are connected differently as shown.The instrument will

automatically sense which configuration is employed.

Special care must be taken when connecting 3 wire Pt100 terminations

to the connector pins.A good crimp must be achieved to avoid Ohmic

contacts which would result in reading errors. Only use good quality

connectors with gold contact material; the Labfacility D type is

recommended.

Application note: Inputs are not isolated in the Tempmaster PRO which is

primarily designed for laboratory applications and site calibration of industrial

temperature sensors. Probes connected to the instrument must therefore be

isolated from high voltage pick-up.

The instrument should be disconnected from the mains adaptor and

operated from its internal batteries in such conditions.

Tempmaster PRO Thermometer

PRT - A PRT - B

54321

9876

4 WIRE

V–

V+

I+

54321

9876

3 WIRE

V– V+

I+

3. Operation

Ensure that the instrument is connected to a suitable supply and that the required

connections are made.

Switch on using the ‘POWER’ key.The display will show the programme (software)

designation followed by a short delay while the internal checks are carried out.The

instrument will then commence normal operation according to the selected mode prior

to switch-off, e.g. if channel B, PRT was in use when switched off, this will be the mode

when switched on.

OPERATION requires the selection of appropriate menus which are shown on the

display screen. Menu screens are obtained as shown in the following sections although

the procedure is described in the text in each case.

Display brightness can be adjusted as required in the ‘SETTINGS’ sub-menu described

later.

Tempmaster PRO Thermometer

Main Menu

Logging

Main Menu

Settings

Main Menu

Brightness

Main Menu

D>A Setup

Main Menu

A–B Null

Main Menu

Correct

Pt100

Corr

Enter Corr

Chan

Next Coeff

Chan

Next Next

View

Log

Enter Write

Log

Next Start

Log

Next Next

Erase

Log

Smart

Probe

Enter System

Next Set

Time

Next Next

About

D>A

Zero

Enter D>A

Span

Next Next

Enter New

Null

Next Next

Set

Bright

Enter

Escape

Use Null

ENTER to

toggle on

or off

ENTER to edit

then

INC/DEC to change

ENTER to accept

ENTER

Null is computed

then returns to main

menu screen

3a To read sensor temperature directly

Press ‘SENSOR’ key to select the required type of sensor if different to that

currently indicated

Brief repeated key presses will step through the various types or holding the key

depressed will auto-repeat (scroll through); this applies to other functions as well.

NOTE: If for any selected channel the sensor is either not connected

(including sensor open circuit) the display will show ‘BROKEN PROBE’.

Press ‘CHANNEL’ to select inputs A, B or A-B (differential)

Press UNITS to display the desired units °C, °F, K or Ω(dependent on the type of

sensor selected).

Press ‘RESOLUTION’ to display the desired resolution, either 0.01 or 0.001 for

°C, K and Ωonly. Only 0.01 resolution can be used with °F.

3b To read differential temperature

The difference in temperature between two sensors can be obtained by displaying

channel A-B. Ensure that the required sensors are connected to the appropriate A

and B inputs.

Press ‘CHANNEL’ to select A-B after first setting up the individual channels A and

B with sensor type and corrections ON/OFF as required. Press ‘UNITS’ to display

the desired temperature units which must be appropriate to both types of sensor.

The value now displayed is the difference value between sensors A and B as

selected (i.e.A-B).

For calorimetry and certain other applications, to optimise the precision of such

differential measurements, the probe tolerances can be nulled as follows:

Nulling procedure requires the relevant probes A and B to be tagged for

repeatability. Ensure that both sensors are held at the same temperature

(say 0°C or other value) and measure A-B.

It is possible to null out differences between the two sensors measured

differentially as follows:

Tempmaster PRO Thermometer

Obtain the ‘NULL’ menu A-B Null by scrolling through the sub-menus until the

menu appears. Press ‘ENTER’.

The display screen shows: =USE NULL ON/OFF & VALUE=

i) Acquiring a new null

ii) Applying a measured null value

The last null value will be applied such that the display value used is (A-B) –

(Null value).

The display screen shows: ACQUIRE NEW A-B

NULL VALUE (DEG C)

VALUE =

3c Matching Tempmaster PRO to calibrated sensors

It is possible to automatically match the Tempmaster PRO to Pt100 sensors with

dedicated calibration values via the PC software (see p17). Such values published

in associated certificate indicate true Ω, °C and value corresponding to accurately

known reference temperatures.

Viewing corrections via the keypad

1. Obtain the required thermocouple (TC) or Pt100 (PRT) ‘CORRECTIONS’

menu; press ‘MENU’ and then ‘CORRECT’. Press ‘ENTER’.

The display screen shows: VIEW CORRECTIONS or VIEW CORRECTIONS

FOR THERMOCOUPLES FOR Pt100 SENSORS

Tempmaster PRO Thermometer

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