ATP Electronics HT-8892 User Manual

User's Guide

Precision Hygro-Thermometer

2

Introduction

Congratulations on your purchase of the Precision Hygro-Thermometer. This
device measures Humidity, Air Temperature, Dew Point temperature and Wet
Bulb temperature. Advanced features include Data Hold, Auto Power Off, and
MAX/MIN reading. Careful use of this meter will provide years of reliable service.

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Specifications

Function Range and Resolution Accuracy

Humidity

0.0 to 100.0%RH

±2%RH (40% to 60%)
±3%RH (20 to 40% and 60 to 80%)

±4%RH (0 to 20% and 80 to 100%)

Temperature

-4.0 to 140.0oF

(-20.0 to 60.0oC)

±1.8oF (±1oC)

-22.0 to – 3.9oF

and 140.1 to 212.0oF

(-30.0 to -19.9oC

and 60.1 to 100.0oC)

±2.7oF (±1.5oC)

Display Dual LCD
Response Time: <15 seconds (90% of final value in moving air)
Sensor Type Humidity: Precision capacitance sensor

Temperature: Thermistor

Absolute Humidity 0 to 500g/m3, 0 to 218.5gr/ft3(calculated from RH and

Air temperature measurements)

Wet Bulb 32 to 176°F (0 to 80°C) (calculated from RH and Air

temperature measurements)

Dew Point -22 to 212°F (-30 to 100°C) (calculated from RH and Air

temperature measurements)

Operating Conditions 32 to 122oF (0 to 50oC); < 80% RH non-condensing
Storage Conditions -40 to 185oF (-40 to 85oC); <99% RH non-condensing
Power Supply 9 Volt battery
Battery Life Approx. 48 hours
Dimensions / Weight 300x 75 x 50 (mm); 400g

4

Meter Description

1. Humidity & Temperature Sensor

2. LCD Display

3. Backlight button

4. °C/°F /Wet Bulb/Dew Point button

5. MIN/MAX button

6. Power ON/OFF button

7. Relative Humidity/Absolute Humidity button

8. HOLD button

Note: The battery compartment is located
on the rear of the instrument

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2

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4

5

6

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5

Display Description

1. Relative Humidity %

2. Absolute Humidity. Grams Per Cubic Meters

3. Absolute Humidity. Grains Per Cubic Feet

4. Humidity Display

5. °C

6. °F

7. Dew Point

8. Wet Bulb

9. Hold

10. Minimum

11. Maximum

12. Low Battery

13. Auto Off

14. Temp/WB/DP Display

15. Absolute Humidity

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Operation

Power

Press the power button( ) to turn power on or off.

Taking measurements

1. Hold the probe in the area to be tested.

2. Allow adequate time for readings to stabilize.

3. Pressing the MODE button toggles the top
display between RH%, g/m3 and gr/ft3 .

4. Pressing the °C/°F button toggles the lower
display between Temperature (°F),
Temperature (°C), Dew Point (°C), Dew Point
(°F), Wet Bulb (°C) and Wet Bulb (°F).

Absolute Humidity measurements

1. To select the Absolute Humidity measurement,
press the MODE button until “g/m3” (or “gr/ft3”)
and “abs” appears in the LCD.

2. Absolute Humidity is now displayed.

Dew Point measurements

1. To select the Dew Point measurement, press
the °C/°F button until DP (°F or °C) appears in
the lower right.

2. Dew Point temperature is now displayed.

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Wet Bulb measurements

1. To select the Wet Bulb measurement, press the
°C/°F button until WB (°F or °C) appears in the lower
right.

2. Wet Bulb temperature is now displayed.

Temperature measurements

1. To select the temperature measurement,

press the °C/°F button until °C or °F appears
in the lower right.

2. Temperature is now displayed.

Data Hold

Press the HOLD button momentarily to freeze the
displayed readings. ”HOLD” will appear on the
lower right-hand side of the display. Press the
HOLD button again to return to normal operation.

8

Minimum (MIN) Maximum (MAX) Function

The MIN/MAX mode allows the user to view only
the lowest (MIN) or highest (MAX) readings.

Press the MIN/MAX button once and “MIN”
appears on the display. The LCD is now
displaying the minimum reading of the selected
parameter in the display. The display will not
change until a lower reading is registered.

Press the MIN/MAX button again and “MAX”
appears on the display. The LCD is now
displaying the maximum reading of the selected
parameter in the display. The display will not
change until a higher reading is registered.

Press the MIN/MAX button again to exit the
MIN/MAX mode, and the “MAX” or “MIN” icon will disappear.

Note: While powering on the meter per time, it restarts recording Minimum and

Maximum and the recordings don’t stop until the meter is turnned off.

Backlight

Press to turn on the backlight. To turn the backlight off, press again.

Automatic Power OFF

The meter has a default setting that automatically
shuts the meter off after 10 minutes (indicated by
the symbol on the display). This battery saving
feature can be disabled. To disable the auto power
off function, simply press and hold the HOLD
button while powering on. The symbol will not
appear when auto power off has been disabled. The
meter will revert to the default auto-off mode when
powered off.

9

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 battery symbol will appear on the LCD.
Replace the 9 Volt battery by removing the Philips head screw holding the rear
battery compartment cover to access the battery compartment. Ensure that the
compartment cover is securely fastened when finished.