TRIPLETT RHT32 Digital Psychrometer User Manual
- June 6, 2024
- TRIPLETT
Table of Contents
User Manual
RHT32
Digital Psychrometer
Introduction
Congratulations on your purchase of the Triplett RHT32 Digital Psychrometer. This unique meter is 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 a protective turn cap. The psychrometer is a microprocessor-based design. A must device for HVAC engineers use.
Description
METER DESCRIPTION
- Power On/Off Button
- °C/°F Button, Switch between °C and °F
- MODE Button, Switch between Db & DP (Db=Air Temperature)
- HOLD Button Hold display Power Button + HOLD = Non-Sleep mode
(The default setting is auto-sleep in 5 minutes)
- RESET Button, Reset Min/Max memory
- MN/MX Button
Display the 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
- Turning on the protective sensor cap in a counterclockwise direction.
- Turn the meter on by pressing the power button (see figure B).
- Press the C/F key for more than 1 second to convert the reading to the desired unit. Both the temperature and relative humidity measurements will display simultaneously (see figure C).
Figure B Figure C (requires optional probe)
Data Hold Function
- Press the “HOLD” button until (HLD) appears in the display.
- The current reading is now held and will not change until the Hold function is canceled (see figure D).
- Press the “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
- Press the MODE button until “DP” appears on display.
- Select to display dew point or dry-bulb (air temp.) in any mode while the unit is on (see figure E).
Figure E
Wet Bulb Function
Turn the meter on by pressing the power button. You will see the “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 the meter, “Ex” won’t
appear on display even when pressing the RESET button.
Min/Max Function
- 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.
- 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.
- To return to the current temperature and humidity readings press and hold the MN/MX button until Min or Max disappear from the display.
- 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 the 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 the troubleshooting section below.
- Turn the meter off and plug the sensor probe into a 33% salt bottle. Press the “ON/OFF + C/F ” buttons for more than one second to enter calibration mode.
- “32.8%” will flash on the display, when “—.-” is showing on the display, which means the values are invalid in the calibration process. After 30 min, the flashing will stop to indicate the procedure is finished.
- Move the sensor to a 75% salt bottle and press “MN/MX” for more than one second to enter 75.3% calibration. “75.3%” will flash on the display.
- 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
- ER1 : Relative Humidity measurement failure. Has the meter been repaired or replaced?
- ER2 : Internal temperature circuit failure. Has the meter been repaired or replaced?
- ER3: Reference resistance failure. Has the meter been repaired or replaced?
- ER4: Internal temperature sensor measurement is out of range. Always measure within the published specified range.
- 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%) @ 23°C
Temperature (internal sensor)| -20 to 50°C (-4.0 to 122.0°F)| ±1°C (±1.8°F)
Temperature (external probe range)| -20 to 70°C (-4.0 to 158.0°F)| ±1°C
(±1.8°F)
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 that 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
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