Display Description; Operation; Data Hold - Extech Instruments RH355 User Manual

Display Description

1. Air, T1, Air-T1, Dew Point, Low Battery
2. Temperature °C/°F
3. T2, T1-T2, T1-Dew Point, Wet Bulb
4. Temperature °C/°F
5. Date (month, day, year), Time (24 hour clock)
6. Memory Store/Recall Location
7. Relative Humidity %
8. Maximum, Minimum
9. Hold, Average

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 [T1
T1 temperature, Air-T1, and DP (Dew Point).
7. Pressing the [T2
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/OFF
enter setup mode. Momentarily press the [T1
display. Press the [MEM] button to toggle between C or F. Press the [T2
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/OFF
enter setup mode. Press the [T1
in sequence. Press the [MEM] button to change the settings. After the Minute setting is
complete, press the [T2
operation.

Data Hold

Press the [REC ] button momentarily to freeze the displayed reading. The 'HLD' icon will
HOLD
appear on the upper right-hand side of the display. Press the [REC
return to normal operation.
] button toggles the top left display between Air temperature,
T/DP
SEL
] button toggles the lower left display between WB (Wet Bulb),
▲
WB
] button to select Year, Month, Day, Hour and Minute
T/DP
SEL
] button to confirm the date/time setting and return to normal
▲
WB
1
2
3
4
] button for more than one second to
SET
] button until "unit" appears in the
T/DP
SEL
] button for more than one second to
SET
3
9
8
7
6
5
] button to
▲
WB
] button again to
HOLD
RH350/355 V1.7 11/04