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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
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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: Battery compartment is located on the rear of
the instrument.
Display Description
1. Air, T1, Air-T1, Dew Point, Low
2. Temperature °C/°F
3. T2, T1-T2, T1-Dew Point, Wet Bulb
4. Temperature °C/°F
5. Date (month, day, year), Time (24
6. Memory Store/Recall Location
7. Relative Humidity %
8. Maximum, Minimum
9. Hold, Average
Battery
hour clock)
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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.
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.
T/DP
6. Pressing the [T1
between Air temperature, T1 temperature, Air-T1, and DP
(Dew Point).
7. Pressing the [T2
SEL
] button toggles the top left display
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/OFF
than 2 seconds to enter setup mode. Prnt will appear on the display.
Momentarily press the [T1
Press the [MEM] button to toggle between C or F.
Press the [T2
operation.
3. Selecting temperature units of measure (C/F)
SEL
T/DP
WB
] button to confirm the setting and return to normal
]
SET
] button for more
Press the [T1
sequence.
1. Setting the Date/Time (24 hour clock)
SEL
T/DP
] button to select Year, Month, Day, Hour and Minute in
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Press the [MEM] button to change the settings.
Press the [T2
] button to confirm the date/time setting and return to
WB
normal operation.
Data Hold
Press the [REC
HOLD
] button momentarily to freeze the displayed reading.
The 'HLD' icon will appear on the upper right-hand side of the display.
Press the [REC
HOLD
] 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/AV
MN appears on the display. The display is now showing the lowest humidity
and temperature readings in memory. Press the [Min/AV
and MX appears on the display. The display is now showing the maximum
humidity and temperature readings in memory. Press the [Min/AV
again to display the average (AVG) readings in memory. To exit the
MIN/MAX/AVG mode, press the [Min/AV
RST
] button. To clear the current
min/max/avg readings in memory, press and hold the [Min/AV
more than two seconds.
RST
] button once and
RST
] button again
RST
RST
] button for
] button
Backlight Display
Press the [Min/AV
backlight. It will remain on for ten seconds.
Automatic Power OFF
With the meter off, press and hold down the [ON/OFF
[REC
settings.
Press the [MEM] button to select non-sleep (n) or 2, 5, 10, 20, 40 and 60
minutes autosleep.
Press [T2
HOLD
] buttons for more than 1 second to enter auto power off
WB
RST
] and [MEM] buttons together to turn on the
] to confirm the selection.
SET
] +
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Manual Datalogging
Manual datalogging 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 [REC
on the display.
6. Press the [MEM] button to manually increment through the stored
readings.
7. Press [REC
memory.
8. Press [REC
operation.
HOLD
] + [MEM] for more than 1 second to clear the
] for more than 1 second to return to normal
HOLD
HOLD
] button for 2
Note: In RECALL mode, pressing the [Min/AV
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
RST
] button for min/max/avg
The meter is equipped with an RS -232 PC interface jack (3.5mm phono) for
connection to a PC for Data Acquisition.
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Specifications
Low Battery
Overrange
Underrange
Dimensions /
Function
Range and Resolution
Humidity
Temperature (air)
Temperature
(external K)
Display
Sensor Type
Response Time
Triple LCD
Humidity: Precision
capacitance sensor
Internal Temperature:
Thermistor
External Temperature: K-Type Thermocouple
60 seconds typical
-68 to 50oC (-90.4 to 122.0oF) (calculated from RH
0.0 to 100.0% RH
-20 to 50oC (-4.0 to
122.0oF)
-200 to 1370oC (-328 to
2498oF)
±3% RH (10 to 90%)
Accuracy
@ 23°C
±1oC (±1.8oF)
±(0.3% rdg + 1oC
(1.8oF))
Dew Point
Wet Bulb
Indicator
Indicator
Indicator
Operating
Conditions
Storage
Conditions
Power Supply
Battery Life
and Air temperature
measurements)
-21.6 to 50oC (-6.88 to 122.0oF) (calculated from
RH and Air
temperature measurements)
Yes
E2 (air) E5 (T1), E8 (T2)
E3 (air), E6 (T1), E9 (T2)
-20 to 50oC (-4 to 122oF); < 99% RH noncondensing
-40 to 85oC (-40 to 185oF); <99% RH noncondensing
Approx. 300 hours
Weight
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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
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
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
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