TRIPP-LITE RHT37 Dual Input Hygro-Thermometer Psychrometer User Manual
- June 5, 2024
- Tripp Lite
Table of Contents
User Manual
RHT37
Dual Input Hygro-Thermometer
Psychrometer
Test Equipment Depot 1400-5174431
5 Commonwealth Ave Woburn, MA 01801
Phone 781-665-1400
Toll-Free 1-800-517-8431
**** https://www.testequipmentdepot.com/
Introduction
Congratulations on your purchase of the Triplett RHT37 Dual Input Hygro- Thermometer/Psychrometer. This displays humidity, dew point, wet bulb, temperature, and temperature differential. The triple backlit LCD can be changed to display humidity, temperature, dew point or humidity, temperature and wet bulb or humidity, temperature, and Type K thermometer. The RHT37 can also display the temperature difference between Type K T1 and T2 or air temperature and Type K or Type K and dew point.
Description
METER DESCRIPTION
- Humidity Sensor & Air Temperature Sensor
- Triple LCD Display
- On/Off; Set Mode
- Min/Max/Average; Reset Min/Max
- Air, T1, Air-T1, Dew Point
- T1 probe input
- T2 probe input
- T1-T2, T2, T1-Dew Point, Wet Bulb
- Store Current Reading; Backlight
- Hold; Recall Mode
- RS232 port
Note: The battery compartment is located on the rear of the instrument.
Display Description
- Air, T1, Air-T1, Dew Point, Low Battery
- Temperature °C/°F
- T2, T1-T2, T1-Dew Point, Wet Bulb
- Temperature °C/°F
- Date (month, day, year), Time (24-hour clock)
- Memory Store/Recall Location
- Relative Humidity %
- Maximum, Minimum
- 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 the power on or off. The meter will perform
a short self-test when turned on.
Taking measurements
- Hold the probe in the area to be tested.
- Allow adequate time for readings to stabilize.
- The Relative Humidity measurement appears in the right display along with the date and time.
- Air Temperature appears in the top left display.
- Wet Bulb is in the lower-left display.
- Pressing the [T1T/DPSEL] button toggles the top left display between Air temperature, T1 temperature, Air-T1, and DP (Dew Point).
- Pressing the [T2▲WB] button toggles the lower left display between WB (Wet Bulb), T1-T2, T2, and T1-DP (Dew Point).
SETUP
When the meter is off, press and hold the [ON/OFFSET] button for more than
2 seconds to enter setup mode. The print will appear on the display.
3. Selecting temperature units of measure (C/F)
Momentarily press the [T1T/DPSEL] button until “unit” appears on 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.
1. Setting the Date/Time (24-hour clock)
Press the [T1T/DPSEL] button to select Year, Month, Day, Hour, and Minute
in sequence.
Press the [MEM] button to change the settings.
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.
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 data logging allows the user to store and recall up to 99 readings with
the press of a button.
4. 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.
5. 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.
6. Press the [MEM] button to manually increment through the stored
readings.
7. Press [RECHOLD] + [MEM] for more than 1 second to clear the
memory.
8. 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.
RS-232 PC Communications Interface
The meter is equipped with an RS -232 PC interface jack (3.5mm phono) for
connection to a PC for Data Acquisition.
Specifications
| Function | Range and Resolution | Accuracy |
|---|---|---|
| Humidity | 0.0 to 100.0% RH | ±3% RH (10 to 90%) |
@ 23°C
Temperature (air)| -20 to 50°C (-4.0 to
122.0°F)| ±1°C (±1.8°F)
Temperature (external K)| -200 to 1370°C (-328 to
2498°F)| ±(0.3% rdg + 1°C
(1.8°F))
Display| Triple LCD Humidity: Precision
---|---
Sensor Type| capacitance sensor Internal Temperature: Thermistor
External Temperature: K-Type Thermocouple
Response Time| 60 seconds typical -68 to 50°C (-90.4 to 122.0°F)
(calculated from RH
Dew Point| And Air temperature measurements)
-21.6 to 50°C (-6.88 to 122.0°F) (calculated from
Wet Bulb| RH and Air temperature measurements)
Low Battery Indicator| Yes
Overrange Indicator| E2 (air) E5 (T1), E8 (T2)
Underage Indicator| E3 (an r E6 (T1), E9 (T2)
Operating| -20 to 50°C (-4 to 122°F); < 99% RH non-
Conditions| condensing
Storage| -40 to 85°C (-40 to 185°F); <99% RH non-
Conditions| condensing
Power Supply| 4 x 1.5V ‘AAA’ batteries
Battery Life| Approx. 300 hours
Dimensions / Weight| 230 x 57 x 44mm (9 x 2.2 x 1.7″); 153g (5.3 oz.)
Maintenance
Cleaning and storage
- The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives.
- 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.
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.
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
Copyright © 2021 Triplett
Test Equipment Depot – 800.517.8431 – 5 Commonwealth Ave, Woburn, MA 01801
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