9-IN-1 THERMO-HYGROMETER/ MOISTURE METER USER’S MANUAL RHMG650 Please read this manual carefully and thoroughly before using this product.
TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 – 4 Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 What’s in the Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
• Electronics manufacturing. Alerts provided by the low RH alarm of the RHMG650 can mitigate the risk of damaging high-voltage static discharges. Water damage remediators will also make use of the RHMG650’s ability to calculate an environment’s mixing ratio (often represented by the unit GPP, or grains per pound). GPP is a more useful moisture metric than RH to water damage remediators.
driven deep into a hard material. For softer materials like soil, paper or powders, readings are more likely to reflect the average moisture level of the material between its surface and the penetration depth of the pins (normally far less than 3/8 in.). The RHMG650 can store and recall 20 pairs of measurements in its nonvolatile memory. The instrument also can be set up to sound an alarm if a measured RH or moisture level is above or below a user-defined setpoint.
Fig. 1. The controls and physical structures of the RHMG650 A B A. Humidity/temperature sensor B. Removable hanger tab C. LCD L D. ON/OFF HOLD button. With meter off, pressing C button powers it on. With meter on, briefly pressing button freezes primary and secondary readouts; D pressing and holding button powers meter off. E. MAX/MIN button. For all parameters except moisture E F level, pressing button once displays highest reading G since entering that measurement mode.
Fig. 2.
SETUP INSTRUCTIONS INSTALL BATTERY To open the battery compartment: 1. Turn the meter over and loosen the single screw securing the battery compartment cover. Remove the screw and set it aside. 2. Lift the tab at the bottom of the cover in order to remove it and set it aside. 3. Plug the included “9V” battery into the wired socket inside the compartment. The terminals of the battery and the socket mate in only one way, with the smaller male terminal plugging into the larger female terminal. 4.
As the figure on the left shows, moving the ▼ pointer four positions to the right (by pressing the UP> button four times) switches the meter to operate in Ambient pressure mode. In Dew point measurement mode, will appear at the left of the secondary readout to remind you that the value shown reflects the dew point temperature, rather than the ambient temperature. GENERAL CONTROLS Changing measurement units. By default, the RHMG650 uses Imperial units for all parametric readouts.
MIN/MAX tracking. For all parameters except moisture level: • Pressing the MAX/MIN button once displays the highest reading since entering that measurement mode. will appear at the left of the primary readout. • Pressing the button twice displays the lowest reading since entering that measurement mode. will appear at the left of the primary readout. • Pressing the button a third time resumes real-time measurement and display of the same parameter.
To enter Alarm set mode, press the MAX/MIN and UNIT buttons at the same time while in RH, MOIST INT or MOIST EXT mode. Doing so will display the current value of the selected parameter’s high setpoint and cause the word HIGH to appear near the upper left of the display, as shown on the left. All three parameters require you to use the same three-step sequence of button presses for changing their setpoint(s).
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 RHMG650 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.
If the primary readout shows 0.0% with the meter in your hand (and not touching anything), the meter is ready to make measurements. To measure the moisture level of a material, press the pinless sensor on the back of the meter (Fig. 1, Callout L) against it. The moisture level, as percentage, will appear on the primary readout. If the primary readout shows a value other than 0.0%, you should reset the baseline of measurements in MOIST INT mode.
SPECIFICATIONS Ambient Temperature Measurement Range -20° to 167°F (-29° to 75°C)/±3.6°F (2°C) Ambient Temperature Measurement Accuracy ±3.6°F (2°C) RH Measurement Range 0 to 100% RH Measurement Accuracy ±2.5% from 11 to 90%RH; ±3%RH elsewhere Absolute Humidity Range 0.5 to 240mg/m3 (mg/L) GPP Range 0 to 999 GPP (0 to 160g/kg) Relative/Absolute Moisture Level Range 0 to 99.9% Pinless Moisture Measurement Depth 0.75 in.
OPERATING & MAINTENANCE TIPS • When the icon appears on the bottom row of the LCD, it’s time to install a fresh “9V” battery using the procedure on p.7. • Do not immerse the RHMG650 in water or get water on it. • Do not disassemble the unit. Opening the case voids the warranty. • To avoid fouling the humidity/temperature sensor, do not operate the unit in very dusty environments. Replace the dust cap protecting the sensor after each measurement session.
RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality.
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