RH355 datasheet(3/6 Pages) EXTECH

3 / 6 page

RH350/355 V2.1 8/08

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 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.

6. Pressing the

[T1T/DPSEL] button toggles the top left display between Air temperature,

T1 temperature, Air-T1, and DP (Dew Point).

7. Pressing the

[T2▲WB] button toggles the lower left display between WB (Wet Bulb),

T1-T2, T2, and T1-DP (Dew Point).

Selecting temperature units of measure (C/F)

When the meter is off, press and hold the

[ON/OFFSET] button for more than one second to

enter setup mode. 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.

Setting the Date/Time (24 hour clock)

When the meter is off, press and hold the

[ON/OFFSET] button for more than one second to

enter setup mode. Press the

[T1T/DPSEL] button to select Year, Month, Day, Hour and Minute

in sequence. Press the

[MEM] button to change the settings. After the Minute setting is

complete, 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.

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