Measuring Moisture Levels - Omega RH650 User Manual

Two notes related to alarms:
• HIGH alarm setpoints must be higher than LOW alarm setpoints. When the display is showing
LOW in Alarm set mode, pressing the STORE/ENTER button to save a change that violates
this rule will not succeed in returning the RH650 to real-time measurement. Instead, the
beeper will sound four times and the Alarm set sequence will return to the first step.
Consider this a prompt to reset the HIGH alarm setpoint to a value greater than the LOW
alarm setpoint.
• The original factory settings of the HIGH and LOW alarm setpoints are 85% and 25%,
respectively. So if your first use of the meter is in a exceptionally humid or dry environment,
an alarm may sound immediately. To disarm the alarm, follow the instructions in the
preceding two paragraphs.

MEASURING MOISTURE LEVELS

In addition to the modes for measuring five condensation-related parameters, the RH650 has two
separate moisture level measurement modes: MOIST INT and MOIST EXT. In MOIST INT mode,
the meter uses a non-invasive (pinless) sensor on the back of the unit to detect moisture on or
within 0.75 in. (19mm) of the surface of a material. In MOIST EXT mode, the meter uses the
included pin-type probe to measure the conductivity of a material as a proxy for its moisture
content.
In both moisture level measurement modes, the RH650's display adds a vertical bar graph to the
digital readout of a material's moisture level. The bar graphs (see below) have no scale; they
exist only to provide an analog way to quickly track changes in relative moisture levels.
To use the included pin-type probe to measure the moisture level of a material:
1. Use the UP> or <DN button to move the
2. Insert the plug of the probe into the jack on the bottom of the RH650.
3. Remove the protective cap from the business end of the probe and set it aside.
4. Insert the pins of the probe into the material whose moisture level you wish to measure.
The measured moisture level will appear on the primary readout as a percentage, with the
ambient temperature below it on the secondary readout.
To use the pinless sensor to measure the moisture level of a material, use the UP> or <DN
button to move the
fingers around the rubber grip at the bottom of the unit. Make sure that no part of your hand or
fingers is touching—or even near—the pinless sensor on the back of the meter.
pointer above MOIST INT. Hold the meter in either hand by wrapping your
pointer above MOIST EXT.
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