User Manual
RHT32
Digital Psychrometer
Introduction
Congratulations on your purchase of the Triplett RHT32 Digital
Psychrometer. This unique meter designed as pocket size, battery operated
for Humidity, Dry Bulb, Dew Point, Wet Bulb, External Temperature &
Temperature Differential measurement. The sensor is also specially
protected by protective turn cap.
The psychrometer is a micro processor-based design. A must device for
HVAC engineers use.
Description
METER DESCRIPTION
1. Power On/Off Button
2. °C/°F Button, Switch
between °C and °F
3. MODE Button, Switch
between Db & DP (Db=Air
Temperature)
4. HOLD Button
Hold display
Power Button +
HOLD = Non-Sleep mode
(The default setting is auto-sleep
in 5 minutes)
1. RESET Button,
Reset Min/Max memory
2. MN/MX Button
Display minimum value of
memory from when the
meter is turned on to now.
Display maximum
value of memory from
when the meter is turned
on to now.
Operation
Sensor Protective Cap
Turn the protective cap (top of
meter), in the direction of the OPEN
arrow to allow air into the sensor
cavity. Turn the cap in the direction
of the CLOSE arrow to protect the
sensors. Always open the cap to
take measurements and close when
storing.
Meter Power
Press the power button for one second to switch the meter ON/OFF.
The meter will perform a short self-test when switched ON.
Auto Power Off (Sleep Function)
The meter will turn itself off after 5 minutes.
To override Auto Power Off function, press + HOLD while the meter
is off. When "n" appears (see figure A), release the HOLD button. The
meter is now in Non-Sleep Mode.
Figure A
Mode Options
1. Turning on the protective sensor cap in counterclockwise direction.
2. Turn meter on by pressing power button (see figure B).
3. Press C/F key for more than 1 second to convert reading to
desired unit. Both the temperature and relative humidity
measurement will display simultaneously (see figure C).
Figure B Figure C (requires optional brobe)
Data Hold Function
1. Press "HOLD" button until (HLD) appears in display.
2. The current reading is now held and will not change
until the Hold function is cancelled (see figure D).
3. Press "HOLD" button again to cancel the Hold function.
Figure D
The Hold function can be used on
humidity, dew-point, dry bulb/T1, external
temperature/ T2, wet bulb and
temperature difference.
Dew Point Function
1. Press MODE button until "DP" appears on display.
2. Select to display dew point or dry bulb (air temp.) in any mode
while the unit is on (see figure E).
Figure E
Figure E1
Wet Bulb Function
Turn the meter on by pressing power button.
You will see "Wb" temperature indicated on the display (see figure E1).
External Temperature Function
1. Plug the optional external probe into the meter.
2. Press the RESET button until "Ex" appears on display.
The meter will now display external probe temperature. See figure F.
Figure F
Note: If the probe isn’t plugged in
meter, "Ex" won’t appear on display
even when pressing the RESET
button.
Min/Max Function
1. Press and hold MN/MX button until (MIN) appears on the
display (see figure G). The display is now showing
minimum humidity and temperature readings currently in
the memory.
2. Press and hold MN/MX button again until (MAX) appears on the
display (see figure H). The display is now showing maximum
humidity and temperature readings currently in the memory.
3. To return to the current temperature and humidity
readings press and hold the MN/MX button until Min or Max
disappear from the display.
4. Press the RESET or the MN/MX button for more than two
seconds to clear currently in the memory.
Figure G
NOTE: While checking the MIN/MAX value for "Ex" don’t replace
the probe or you will get an error code. If you don’t plug the probe
into socket before turning the meter on, the error code will also
appear when you check the MIN/MAX value.
NOTE: Low battery power tends to give inaccurate readings,
therefore make sure you have enough power.
Calibration
WARNINGS
• You can exit the calibration procedure without saving the data in
the memory by pressing the "ON/OFF" button before step 4. During
step 4, press the "ON/OFF" button to exit the calibration mode.
• Auto power off is disabled in calibration mode.
• For the highest accuracy, the calibration should be operated at
23°C.
• If the reading is out of 75.3% 0.5% at step 4, this indicates the
calibration has failed. See troubleshooting section below.
1. Turn the meter off and plug the sensor probe into 33% salt bottle.
Press the "ON/OFF + C/F " buttons for more than one second to
enter calibration mode.
2. "32.8%" will flash on the display, when "---.-" is showing on the
display, that means the values are invalid in the calibration process.
After 30 min, the flashing will stop to indicate the procedure is
finished.
3. Move the sensor to 75% salt bottle and press "MN/MX" for more
than one second to enter 75.3% calibration. "75.3%" will flash
on the display.
4. The flashing will stop after 30 minutes, at this point the
entire calibration is completed and the calibration data
has been saved in memory.
Maintenance
Cleaning and storage
5. Clean the meter housing with the sensor cap closed, using a
lightly damp cloth and mild detergent when necessary. Do not
use solvents or abrasives.
6. Store the meter -- with the protective cap closed -- in an area with
moderate temperature and humidity (refer to the operating/storage
conditions specifications).
Battery Replacement
When the batteries need replacing, the symbol will appear on the
LCD. Replace the two (2) 1.5 ‘AAA’ batteries in the rear battery
compartment, observing correct polarity.
Never dispose of used batteries or rechargeable batteries
in household waste. As consumers, users are legally
required to take used batteries to appropriate collection
sites, the retail store where the batteries were purchased,
or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste.
The user is obligated to take end-of-life devices to a designated
collection point for the disposal of electrical and electronic
equipment.
Other Battery Safety Reminders
Never dispose of batteries in a fire. Batteries may explode or
leak.
Never mix battery types. Always install new batteries of the
same type.
Error Message Displays
1. ER1: Relative Humidity measurement failure. Have the meter
repaired or replaced.
2. ER2: Internal temperature circuit failure. Have the meter repaired or
replaced.
3. ER3: Reference resistance failure. Have the meter repaired or
replaced.
4. ER4: Internal temperature sensor measurement is out of range.
Always measure within the published specified range.
5. ER5: External temperature sensor measurement is out of range.
Always measure within the specified range of the external
temperature sensor.
Specifications
Range and
Resolution
Accuracy
Humidity
0.0 to 100.0% RH
±3% RH (10 to 90%) @ 23oC
Temperature (internal sensor)
-20 to 50oC (-4.0 to
±1oC (±1.8oF)
122.0oF)
Temperature (external
-20 to 70oC (-4.0 to
±1oC (±1.8oF)
probe range)
158.0oF)
Display
Triple-reading LCD
Sensor Types
Relative Humidity: Precision capacitance sensor
Temperature (internal): Thermistor
T2 Temperature probe: Thermistor
Response Time
60 seconds typical
Dew Point range
-68 to 50oC (-90.4 to 122.0oF) (calculated from RH and air
temperature
measurements)
Wet Bulb range
-21.6 to 50oC (-6.88 to 122.0oF) (calculated from RH and air
temperature
measurements)
Operating Conditions
-20 to 50oC (-4 to 122oF); < 99% RH non-condensing
Storage Conditions
-40 to 85oC (-40 to 185oF); <99% RH non-condensing
Power Supply
2 x 1.5V ‘AAA’ batteries
Battery Life
Approx. 80 hours
Dimensions / Weight
178.5 x 48.8 x 25.2mm (7.0 x 1.9 x 1.0”); 140g (4.9 oz.)
Warranty
Triplett / Jewell Instruments extends the following warranty to the original purchaser of
these goods for use. Triplett warrants to the original purchaser for use that the products
sold by it will be free from defects in workmanship and material for a period of (1) one
year from the date of purchase. This warranty does not apply to any of our products
which have been repaired or altered by unauthorized persons in any way or purchased
from unauthorized distributors so as, in our sole judgment, to injure their stability or
reliability, or which have been subject to misuse, abuse, misapplication, negligence,
accident or which have had the serial numbers altered, defaced, or removed.
Accessories, including batteries are not covered by this warranty
Copyright © 2021 Triplett
www.triplett.com
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