TRIPLETT RHT37 Dual Input Hygro-Thermometer Psychrometer User Manual

: June 6, 2024
: TRIPLETT

Table of Contents

Introduction
Description
Display Description
Manual Datalogging
RS-232 PC Communications Interface
Specifications
Maintenance
Warranty
Documents / Resources

**User Manual
RHT37
Dual Input Hygro-Thermometer
Psychrometer

**

Introduction

Congratulations on your purchase of the Triplett RHT37 Dual Input HygroThermometer/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: 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, counterclockwise a quarter of a turn to expose the sensors. Twist the protective sensor cap, located at the top of the meter, counterclockwise 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. 5. 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 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.
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 AwB] 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 [RECHow] 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 [M./AVRsr] button once and MN appears on the display. The display is now showing the lowest humidity and temperature readings in memory. Press the [M./AVRsr] button again and MX appears on the display. The display is now showing the maximum humidity and temperature readings in memory. Press the [Min/AVasi] button again to display the average (AVG) readings in memory. To exit the MIN/MAX/AVG mode, press the [Min/AVRsi] button. To clear the current min/max/avg readings in memory, press and hold the [Min/AVRsi] button for more than two seconds.
Backlight Display
Press the [M in/AVRsi] 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/OFFsEr] + [RECHoLo] 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 [ M /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. in

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 50º C (-90.4 to 122º F) (calculated from RH

Dew Point| and Air temperature measurements) -21.6 to 50º C (-6.88 to 122.º 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 (air), E6 (T1), E9 (T2)

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
www.triplett.com

Documents / Resources

| TRIPLETT RHT37 Dual Input Hygro-Thermometer Psychrometer [pdf] User Manual
RHT37 Dual Input Hygro-Thermometer Psychrometer, RHT37, Dual Input Hygro- Thermometer Psychrometer
---|---
| TRIPLETT RHT37 Dual Input Hygro Thermometer Psychrometer [pdf] User Manual
RHT37 Dual Input Hygro Thermometer Psychrometer, RHT37, Dual Input Hygro Thermometer Psychrometer, Hygro Thermometer Psychrometer, Thermometer Psychrometer, Psychrometer
| TRIPLETT RHT37 Dual Input Hygro Thermometer Psychrometer [pdf] User Manual
RHT37 Dual Input Hygro Thermometer Psychrometer, RHT37, Dual Input Hygro Thermometer Psychrometer, Hygro Thermometer Psychrometer, Thermometer Psychrometer, Psychrometer