Tenmars TM-731 User manual

Temperature / Humidity Meter
TM-731
User’s Manual
Tenmars
TENMARS ELECTRONICS CO., LTD
HB2TM7310000

CONTENTS
1 PREFACE .................................................................................................................. 1
2 CHARACTERISTICS................................................................................................. 1
3 SPECIFICATIONS...................................................................................................... 1
3.1 General Specifications ......................................................................................... 1
3.2 Electrical Specification: (Temperature: 25°C, Humidity: <90% RH)...................... 2
3.3 Accuracy: ............................................................................................................. 2
4 OPERATING INSTRUCTIONS................................................................................... 3
4.4 LCD Display Functions:........................................................................................ 3
4.5 Instrument description.......................................................................................... 3
4.6 MODE: ................................................................................................................. 4
4.7 MAX/MIN/AVG Button.......................................................................................... 4
4.8 Data Hold Button.................................................................................................. 4
4.9 Power Button:....................................................................................................... 4
4.10 Auto Power Off:.................................................................................................... 4
4.11 Enable/Disable Auto Power Off:........................................................................... 4
5 End of life.................................................................................................................. 5
6 Accessories:............................................................................................................. 5
7 Warning and Precautions:.............................................................................. 6
8 EMC ........................................................................................................................... 6
9 Accessories:............................................................................................................. 7
10 Battery Replacement................................................................................................ 7

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1 PREFACE
Thank you for your patronage please read these operating
instructions carefully so that you may correctly operate the
Temperature / Humidity Meter, allowing it to perform all its
intended functions at optimum level.
The Temperature /Humidity Meter use a highly accurate sensor
chip to measure relative humidity and temperature. It is perfect
for many industrial applications, laboratory and other types of
work locations.
2 CHARACTERISTICS
●Dual display of temperature and humidity.
●°C / °F alternate.
●Simultaneously hold both temperature and humidity
readings.
●Simultaneously hold both maximum and minimum and
average readings (MAX/MIN/AVG).
●Auto-power off.
●DEW-POINT and WET-BULB temperature measurement.
3 SPECIFICATIONS
3.1 General Specifications
●Display : Dual LCD display. The maximum value on the
primary display is 999. The maximum value on secondary
display is 999.
●Low Battery Indicator : When the LCD displays " "
symbol, please replace the battery.
●Sampling Rate : 1 sample per second.
●Power Supply : 2 batteries 1.5V AAA MN2400 LR03 AM4.
●Battery Life : 50 hours during consecutive use.
●Dimensions : 107 × 48 × 23 mm (L × W × H)

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●Weight : 80g (excluding the battery)
●Accessories : User manual, battery, and carrying case.
●Operating Temperature and Humidity : 0°C ~ +60°C, <95%
RH. (non-condensing)
●Storage Temperature and Humidity : -10 to 60°C, <70%
RH. (non-condensing)
3.2 Electrical Specification: (Temperature: 25°C,
Humidity: <90% RH)
●Temperature Measurement Range : -20.0°C ~ +50.0°C
(-4.0°F - +122.0°F).
●Humidity Measurement Range : 1.0% ~ 99 %RH.
3.3 Accuracy:
●Humidity : ±3.5% for 20~90%.
●± 5% for 1~19.9 and 90.1~99.
●Temperature : ± 1.0℃, ±1.8℉.

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4 OPERATING INSTRUCTIONS
4.4 LCD Display Functions:
1. Low Battery Detect
2. Primary Display
3. Secondary Display
4. Auto-Power Off Indicator
5. Data Hold
6. MAX Data Hold
7. AVG Reading
8. MIN Data Hold
9. Relative Humidity
10. °C Temperature unit
11. DEW-POINT
12. WET-BULB
13.
°F
Temperture unit
4.5 Instrument description
1. Sensor
2. LCD
3. °C/°F Temperature unit and calibration
button
4. DEW-POINT/WET-BULB/Temperature
button
5. MAX/MIN/AVG Reading button
6. Data hole button
7. On/Off button

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4.6 MODE:
During normal measurement, press “MODE” button to
switch temperatureDew-pointWet-bulb in sequence.
4.7 MAX/MIN/AVG Button
The MAX MIN feature reads and updates the display to
show the maximum or minimum or AVG value measured
after you press the MAX MIN button. Pressing the MAX MIN
button for less than 1 second will put the meter into a mode
of displaying the maximum, minimum, average readings.
Each time the MAX button is pressed, the meter will cycle
between MAX and MIN and AVG readings. Press the MAX
MIN button for more than 2 seconds to disable this feature.
4.8 Data Hold Button
Press “HOLD” button to enter the Data Hold mode. The LCD
will display “HOLD” symbol and hold both the temperature
and humidity readings at the same time. Press”HOLD
“ button again to exit this mode.
4.9 Power Button:
Press the ” ” button more than 2 second to power on the
meter.
4.10Auto Power Off:
To save battery life, the meter powers down automatically
after approximately 12 minutes of inactivity.
4.11 Enable/Disable Auto Power Off:
You can disable or enable Auto Power Off by pressing

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the ” ” button more than 2 second the LCD “ ” symbol
will disappear or enable.
5 End of life
Caution
This symbol indicates that equipment and its
accessories shall be subject to a separate collection
and correct disposal.
6 Accessories:
●User manual.
●1.5V battery (AAA MN2400 LR03 AM4)*2.
●Carrying case.

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7 Warning and Precautions:
●Please refrain from operating the Temperature / Humidity
Meter in an environment with drastic temperature and
humidity changes. Do not store the thermometer in an
environment prone to high temperature, high humidity, or
vigorous vibrations. Avoid exposing the thermometer in a
chemical-contaminated environment.
●When not using the Temperature / Humidity Meter for an
extended period of time, remove the battery to avoid
damage to the thermometer due to the leaking battery
fluid.
●Cleaning and Maintenance : Cigarette ashes and dust on
the humidity sensor can slow down the sensor’s response
time, while causing inaccuracy in measurements. Clean up
the sensor periodically by simply blowing away the dust
particles. Do not apply water or other chemical solvent like
alcohol when cleaning.
●Do not place the Temperature / Humidity Meter inside any
liquid to prevent damage to the Thermometer.
8 EMC-EMC : EN61326-1 This product complies with
requirements of the following European Community
Directives: 89/336/EEC (Electromagnetic Compatibility)
and 73/23/EEC (Low Voltage) as amended by 93/68/EEC
(CE Marking). However, electrical noise or intense
electromagnetic fields in the vicinity of the equipment may
disturb the measurement circuit. Measuring instruments

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will also respond to unwanted signals that may be present
within the measurement circuit. Users should exercise
care and take appropriate precautions to avoid misleading
results when making measurements in the presence of
electronic interference.
9 Accessories:
●User manual.
●1.5V battery (AAA MN2400 LR03 AM4)*2.
●Carrying case.
10 Battery Replacement
1. Turn off the meter and slide out the battery cover.
2. Remove the low batteries.
3. Replace same type batteries (1.5V LR 03 AAA)