Unpacking, Humidity Calibration, Precautions

SECTION 2 UNPACKING

Remove the packing list and verify that all equipment has been received. If there are any questions about the shipment, please call the OMEGA Customer Service Department at 1-800-622-2378.

Upon receipt of shipment, inspect the container and equipment for any signs of damage. Take particular note of any evidence of rough handling in transit. Immediately report any damage to the shipping agent.

NOTE:

The carrier will not honor any claims unless all shipping material is saved for their examination. After examining and removing contents, save packing material and carton in the event reshipment is necessary.

Please note that the following items are in the box:

RH31 INDICATOR:

RH31 Temperature/Humidity Indicator 9 volt Battery

Transparent vinyl case for Indicator Operator’s Manual

RH31 PROBES (refer to Figure 2):

RH30-1, -2, -3, Humidity/Temperature Probe

Plastic Bag to hold probe assembly

Operator’s Manual

SECTION 5 HUMIDITY CALIBRATION

PRECAUTIONS

Due to its design, and ease of access, the humidity sensor must be handled with care. AVOID ANY CONTACT with fingers, atmosphere, or products which could be harmful to the sensor. The sensor must not come in contact with dirt or other foreign material. Incorrect readings can be caused by build-up of material, which can increase or decrease the RH reading.

During measurements, the following precautions should be taken:

1.When the temperature, at the location being measured, changes drastically, allow at least 10 minutes for the measurement to stabilize.

2.The sensor response will vary greatly depending on the air flow in the vicinity being measured, the heat capacity of materials surrounding the probe, and the thermal conductivity. Alllowing for the response time of 30 seconds or so, keep the probe at a distance from the body, when the probe is held in ones hand, to eliminate the effects of body heat.

3.Always turn the unit OFF after measurements are completed. When the meter is not in use for extended periods of time, remove and store the battery.

HUMIDITY SENSOR CLEANING

Use no solvents stronger than DISTILLED WATER to clean the sensors. If necessary, rinse the sensors with distilled water, being careful not to touch it with your fingers. After rinsing, the sensors should air dry for at least 24 hours (prefereably over an air flow register).

DISPLAY CODES

-OVER: Measured values are displayed on the 31/2 digit LCD. For temperatures over 212˚ F (100˚ C) and humidity over 99.9%, the message “OVER” is displayed.

-BATT: When the battery is low, the message “BATT” appears on the display and the batttery must be replaced.

HUMIDITY CALIBRATION

The RH31 Indicator and probes are calibrated at the factory and do not usually need to be recalibrated. The warranty is void if the unit is tampered with while still under warranty. Contact OMEGA Engineering for service information.

The following procedures are necessary only if the unit is operating out of speci- fication and is no longer under warranty. These procedures should be performed by a qualified technician.

Only the RH31-1 general purpose probe & RH31-2 can be field calibrated.

M3185/1098 specifications

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