Extech Instruments RH355 Manuale utente

User's Guide

SuperHeat Psychrometer

Models RH350 and RH355 (kit)

Introduction

Congratulations on your purchase of the Extech RH350 SuperHeat Psychrometer. This

device measures Differential Temperature (T1-T2, Air-T1, T1-DP), Humidity, Air

Temperature, Dew Point and Wet Bulb. Advanced features include built-in memory and

recall of up to 99 data points, Min/MAX/Average readings from the captured data, Data

Hold, selectable Auto Power Off, and an RS-232 for capturing readings to a PC using

HyperTerminal (cable sold separately). Careful use of this meter will provide years of

reliable service.

RH350/355 V1.7 11/04

Specifications

Function Range and Resolution Accuracy

Humidity 0.0 to 100.0% RH ±3% RH (10 to 90%)

@ 23°C

Temperature (air) -4.0 to 122.0oF (-20 to 50oC) ±1.8oF (±1oC)

Temperature (external) T1, T2 -328 to 2250oF (-200 to 1370oC) ±0.3% rdg or

±(1.8oF)1oC

Display Triple LCD

Sensor Type Humidity: Precision capacitance sensor

Internal Temperature: Thermistor

External Temperature: K-Type Thermocouple

Response Time 60 seconds typical

Dew Point -90.4 to 122.0oF (-68 to 50oC) (calculated from RH and Air

temperature measurements)

Wet Bulb -6.88 to 122.0oF (-21.6 to 50oC) (calculated from RH and Air

temperature measurements)

Low Battery Indicator Yes

Overrange Indicator E2 (air) E5 (T1), E8 (T2)

Underrange Indicator E3 (air), E6 (T1), E9 (T2)

Operating Conditions -4 to 122oF (-20 to 50oC); < 99% RH non-condensing

Storage Conditions -40 to 185oF (-40 to 85oC); <99% RH non-condensing

Power Supply 4 x 1.5V ‘AAA’ batteries

Battery Life Approx. 300 hours

Dimensions / Weight 9 x 2.2 x 1.7” (230 x 57 x 44mm); 5.3 oz. (153g)

Meter Description

1. Humidity Sensor & Air Temperature Sensor

2. Triple LCD Display

3. On/Off; Set Mode

4. Min/Max/Average; Reset Min/Max

5. Air, T1, Air-T1, Dew Point

6. T1 probe input

7. T2 probe input

8. T1-T2, T2, T1-Dew Point, Wet Bulb

9. Store Current Reading; Backlight

10. Hold; Recall Mode

11. RS232 port

Note: The battery compartment is located

on the rear of the instrument

RH350/355 V1.7 11/04

Display Description

1. Air, T1, Air-T1, Dew Point, Low Battery

2. Temperature °C/°F

3. T2, T1-T2, T1-Dew Point, Wet Bulb

4. Temperature °C/°F

5. Date (month, day, year), Time (24 hour clock)

6. Memory Store/Recall Location

7. Relative Humidity %

8. Maximum, Minimum

9. Hold, Average

Operation

Open the Protective Sensor Cap

Twist the protective sensor cap, located at the top of the

meter, counter-clockwise a quarter of a turn to expose the

sensors.

Turn Power ON or OFF

Press the [ON/OFF] button to turn power on or off. The

meter will perform a short self-test when turned on.

Taking measurements

1. Hold the probe in the area to be tested.

2. Allow adequate time for readings to stabilize.

3. The Relative Humidity measurement appears in the right display along with the date

and time.

4. Air Temperature appears in the top left display.

5. Wet Bulb is in the lower left display.

6. Pressing the [T1T/DPSEL]button toggles the top left display between Air temperature,

T1 temperature, Air-T1, and DP (Dew Point).

7. Pressing the [T2▲WB]button toggles the lower left display between WB (Wet Bulb),

T1-T2, T2, and T1-DP (Dew Point).

Selecting temperature units of measure (C/F)

When the meter is off, press and hold the [ON/OFFSET] button for more than one second to

enter setup mode. Momentarily press the [T1T/DPSEL]button until “unit” appears in the

display. Press the [MEM] button to toggle between C or F. Press the [T2▲WB]button to

confirm the setting and return to normal operation.

Setting the Date/Time (24 hour clock)

When the meter is off, press and hold the [ON/OFFSET] button for more than one second to

enter setup mode. Press the [T1T/DPSEL]button to select Year, Month, Day, Hour and Minute

in sequence. Press the [MEM] button to change the settings. After the Minute setting is

complete, press the [T2▲WB]button to confirm the date/time setting and return to normal

operation.

Data Hold

Press the [RECHOLD]button momentarily to freeze the displayed reading. The 'HLD' icon will

appear on the upper right-hand side of the display. Press the [RECHOLD]button again to

return to normal operation.

RH350/355 V1.7 11/04

Minimum (MN) Maximum (MX) Average (AVG) Function

The MIN/MAX/Average mode allows the user to view only the lowest (MN), highest (MX) or

average readings. Press the [Min/AVRST]button once and MN appears on the display. The

display is now showing the lowest humidity and temperature readings in memory. Press the

[Min/AVRST]button again and MX appears on the display. The display is now showing the

maximum humidity and temperature readings in memory. Press the [Min/AVRST]button again

to display the average (AVG) readings in memory. To exit the MIN/MAX/AVG mode, press

the [Min/AVRST]button. To clear the current min/max/avg readings in memory, press and hold

the [Min/AVRST] button for more than two seconds.

Backlight Display

Press the [Min/AVRST]and [MEM] buttons together to turn on the backlight. It will remain on

for ten seconds.

Automatic Power OFF

With the meter off, press and hold down the [ON/OFFSET]+[RECHOLD]buttons for more than

1 second to enter auto power off settings. Press the [MEM] button to select non-sleep (n) or

2, 5, 10, 20, 40 and 60 minutes autosleep. Press [T2▲WB]to confirm the selection.

Manual Datalogging

Manual datalogging allows the user to store and recall up to 99 readings with the press of a

button.

1. Press the [MEM] button to manually store a single reading into memory. The display

will flash 3 times and the memory location number will be displayed below the humidity

reading.

2. To view stored readings, press and hold the [RECHOLD]button for 2 seconds and

“RECALL” will blink next to the memory location number on the display.

3. Press the [MEM] button to manually increment through the stored readings.

4. Press [RECHOLD]+[MEM] for more than 1 second to clear the memory.

5. Press [RECHOLD]for more than 1 second to return to normal operation.

Note: In RECALL mode, pressing the [Min/AVRST]button for min/max/avg readings will auto

search the stored readings in memory and display the minimum, maximum and

average values of the stored readings.

Note: An infrared printer port is located on the side of the meter. This feature is used on more

advanced models and is not functional on this model.

RH350/355 V1.7 11/04

CALIBRATION

The following verification and calibration procedures require the 33% and 75% RH reference

bottles which are supplied with the Model RH355 kit.

Accuracy Verification

Checking the 33% or 75% RH Calibration

1. Insert meter’s sensor into the 33% or 75% salt reference bottle

2. Check the reading after a minimum of 10 minutes

3. Verify that the reading is within the accuracy specification

Relative Humidity Calibration (33% and 75%)

33% Calibration

1. Turn the meter Off.

2. Insert the meter sensor into the 33% salt reference bottle.

3. Allow the meter one hour to stabilize.

4. While holding down the [Min/AVRST]button, press and hold the [ON/OFFSET]button

for 2 seconds to enter calibration mode.

5. “32.8%” (reading may vary depending on operating temperature) will flash on the

LCD screen. After 30 minutes, the flashing will stop to indicate that the 33%

calibration is complete. Note: To exit from the calibration procedure before

completion, pressing the [ON/OFFSET]button will turn the meter off.

6. Proceed to the 75% Calibration below.

75% Calibration

1. Insert the meter sensor into the 75% salt reference bottle.

2. Allow the meter one hour to stabilize

3. Press and hold the [Min/AVRST]button for 2 seconds to enter the 75% calibration.

4. “75.3%” (reading may vary depending on operating temperature) will flash on the

LCD. After 30 minutes, the flashing will stop to indicate that the 75% calibration is

complete.

5. Turn power off. Calibration is now complete.

Note: Frequently check the water level in the salt bottles. Both the 33% and 75%

bottles should be completely saturated with some water present. The bottles are

sealed and not refillable.

RH350/355 V1.7 11/04

RS-232 PC Communications Interface

RS-232 data format

Baud rate; 9600, Parity; none, Data bits; 8, Stop bits; 1, Flow control; none

RS-232 Connection

Connect the optional interface cable from the meter to the communications port of the PC.

Using Windows® Terminal or HyperTerminal program for PC Communication

The Terminal or the HyperTerminal program is included in all Windows® operating systems.

Typically it is located using the following path:

START Menu > Programs > Accessories > Communications > Terminal or HyperTerminal

When in the Terminal or HyperTerminal program, configure as follows:

1. In the Connection Description window, enter a name, select an icon and click OK.

2. In the Connect To window, select COM1 or COM2 (depending on which port is being

used) and click OK.

3. In the Port Settings window, select the following data format: Baud rate 9600, no

parity, 8 data bits, 1 stop bit, and no flow control. Click OK to enter the main

HyperTerminal window.

4. In the File Menu, select Properties > Settings > ASCII SETUP, select “echo typed

characters” and “Send line ends with line feeds”. Click OK twice to return to the main

HyperTerminal window.

Format

Txxx.xC:Hxx.x%:Txxx.xC:Txxx.xC:Txxxx.xC:Txxxx.xCLRCCRLF or

Txxx.xF:Hxx.x%:Txxx.xF:Txxx.xF:Txxxx.xF:Txxxx.xFLRCCRLF

Where: The 1st value is Air Temperature, the 2nd value is Humidity, the 3rd value is Dew

Point, the 4th value is Wet Bulb, the 5th value is T1, the 6th value is T2.

Format for error value: Exxn xx is error code, the unit is n

For example: if T1 is disconnected, then transmit:

Txxx.xC:Hxx.x%:Txxx.xC:Txxx.xC:TE04n:Txxxx.xCLRCCRLF or

Txxx.xF:Hxx.x%:Txxx.xF:Txxx.xF:TE04n:Txxxx.xFLRCCRLF

Error Codes

An error message will appear on the display if the meter fails an internal diagnostic test.

Note: Error messages E4 and E7 will not display on the LCD. They will be transmitted to the

PC via the RS-232 cable and viewed in HyperTerminal.

1. E2: Air temperature is over the range.

2. E3: Air temperature is below the range.

3. E4: T1 Thermocouple not plugged in

4. E5: T1 temperature is over the range.

5. E6: T1 temperature is below the range.

6. E7: T2 thermocouple not plugged in

7. E8: T2 temperature is over the range.

8. E9: T2 temperature is below the range.

9. E11: Temperature of isothermal block is over the range.

10. E12: Temperature of isothermal block is below the range.

11. E21~E23: Circuit error. Repair/replacement necessary

12. E25: Circuit error. If problem persists, repair/replacement necessary

13. E26: Circuit error. If problem persists, repair/replacement necessary

RH350/355 V1.7 11/04



Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates,and other

up-to-the-minute product information, visit our website: www.extech.com

Maintenance

Cleaning and storage

1. The meter should be cleaned with a damp cloth and mild detergent when necessary.

Do not use solvents or abrasives.

2. Store the meter in an area with moderate temperature and humidity (refer to the

operating and storage range in the specifications chart earlier in this manual).

Battery Replacement

When the battery power falls low, the symbol will appear on the LCD. Replace the four (4)

1.5 ‘AAA’ batteries by removing the rear battery compartment cover and accessing the

battery compartment. Observe polarity when placing the batteries in the compartment.

Ensure that the compartment cover is securely fastened when finished.

Warranty

EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of

defects in parts and workmanship for one year from date of shipment (a six month limited

warranty applies on sensors and cables). If it should become necessary to return the

instrument for service during or beyond the warranty period, contact the Customer Service

Department at (781) 890-7440 EXTENSION 210 for authorization or visit www.extech.com for

more information. A Return Authorization (RA) number must be issued before any

product is returned to Extech. The sender is responsible for shipping charges, freight,

insurance and proper packaging to prevent damage in transit. This warranty does not apply

to defects resulting from action of the user such as misuse, improper wiring, operation

outside of specification, improper maintenance or repair, or unauthorized modification. Extech

specifically disclaims any implied warranties or merchantability or fitness for a specific

purpose and will not be liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the product. The warranty set forth

above is inclusive and no other warranty, whether written or oral, is expressed or implied.

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