USER GUIDE Digital Formaldehyde Meter Model FM100
EXTECH INSTRUMENTS Introduction Thank you for selecting the Extech Instruments Model FM100. The FM100 measures Formaldehyde CH2O (HCHO) concentration, Air Temperature, and Relative Humidity. The alarm feature alerts the user when the Formaldehyde 0.08ppm limit is exceeded. The FM100 can be wall mounted or used as a table top device. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.
EXTECH INSTRUMENTS Operation Powering the meter If the meter is supplied without batteries installed, install the supplied batteries in the rear battery compartment to power the meter. Please observe proper polarity. If the meter is supplied with the batteries installed, and a protective battery strip is installed in the battery compartment, remove the protective strip to power the meter.
EXTECH INSTRUMENTS ZERO Calibration Ensure that calibration is performed in a clean air environment (no VOCs or HCHO gases). appears on the LCD screen). Press and hold the control button for 3 seconds (until Press and hold the button again to start calibration. Release the control button and wait 300 seconds for the calibration to complete. The meter will display ‘END’ for 2 seconds when calibration is complete and will then return to the normal mode of operation.
EXTECH INSTRUMENTS Relative Humidity Compensation Adjustment is shown on the display, press and hold the control button to enter the relative When humidity compensation adjustment mode. Momentarily press the control button to make a step change in the RH% offset; the range is ‐9 to +9 RH %. When done, press and hold the control button to save the setting. The meter will return to the normal mode.
EXTECH INSTRUMENTS Revert to Factory Default Settings When is shown on the LCD display, press and hold the control button to reset the meter to its default (factory) settings. Escape/Return Function When is shown on the LCD display, press and hold the control button for 3 seconds to abort the current programming step and return to the normal measurement mode. Maintenance Low Battery Condition and Battery Replacement When the battery icon ( ) appears on the LCD, the batteries must be replaced.
EXTECH INSTRUMENTS Specifications Display Multifunction LCD; Dimensions 48 x 28mm (1.89 x 1.10”) Front Panel LED indicator Green for normal, yellow for caution, and red for danger 0.00 to 5.00ppm (mg/m3) Formaldehyde CH2O (HCHO) measurement range HCHO accuracy ±5% of reading +0.03ppm (baseline drift) Accuracy Note: Accuracy meets NIOSH acceptance criterion within ±25% of the true value at 95% confidence level Air Temp. Measurement range 0°C to 50°C (32°F to 122°F) Air Temperature Resolution 0.1°C (0.
