Digital Formaldehyde Meter
Model FM100
USER GUIDE
EXTECH INSTRUMENTS
Introduction
Thank you for selecting the Extech Instruments Model FM100. The FM100 measures
Formaldehyde CH
2
O (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.com) for the latest version of this User
Guide, Product Updates, and Customer Care.
Features
Alternately displays Formaldehyde concentration, Air Temperature, and Relative
Humidity at 6‐second intervals
Bright multicolor LED displays green for safe HCHO levels, yellow for caution, and red for danger
Alarm display icon and audible beeper alerts user when Formaldehyde concentration limit of 0.08ppm is exceeded
Selectable Formaldehyde unit of measure ppm or mg/m 3
ZERO calibration function
Manual temperature and Relative Humidity compensation
Designed with electrochemical CH
2
O (HCHO) sensor
Low battery indicator
Meter Description
1. Offset adjustment potentiometer
2. Control Button
1
3. AC Power Adaptor Port
4. LCD Display
2
3
5
4
5. Multi‐color LED Indicator
Note: Battery compartment, tilt stand, and wall mount located on rear of meter.
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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.
Alternatively, plug an AC adaptor into the jack on the side of the meter and then into an AC power source to power the meter.
Normal Operating Mode
When switched ON, the LCD displays ‘0000’ for a period of time, depending on the time that the meter has been inactive. The meter will then proceed to the normal mode of operation where the LCD displays the current HCHO level in ppm, the Temperature (°C/°F), and RH% (relative humidity) alternately at 6 second intervals.
Multi‐Color Status Indicator LED
The Front panel status LED uses a color‐coding system to inform the user as to the measured
HCHO concentration. Green for Good; Yellow for Hazard; Red for Danger. If the LED fails to illuminate please return the unit for service.
Alarm indication
When the Formaldehyde limit of 0.08ppm is exceeded the meter audibly beeps and flashes an alarm icon on the LCD. Refer to the CONTROL BUTTON section to learn how to silence the beeper.
Control Button
The Control button located on the left side of the meter is used to control and program a variety of meter functions. Press and hold the Control button to enter the function mode. Repeated presses of the control button cycle through the available parameters. These parameters, in order, are:
ZERO Calibration
Temperature Unit selection (°C/°F)
Temperature compensation (used in conjunction with side potentiometer adjust)
Humidity compensation (used in conjunction with side potentiometer adjust)
Unit of measure change (ppm or mg/m 3 )
Alarm Beeper ON/OFF
Factory Default setting reset
Escape/Return (abort operation and return to normal operation)
Note: A removable cover protects the offset adjustment and prevents unintentional adjustment. Remove the protective cover to perform an offset adjustment.
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ZERO Calibration
Ensure that calibration is performed in a clean air environment (no VOCs or HCHO gases).
Press and hold the control button for 3 seconds (until appears on the LCD screen).
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.
Changing Temperature Units o C/ o F
When is shown on the display, press and hold the control button to display the current temperature unit. Momentarily press the Calibration control button to toggle °C and °F units. To save setting, press and hold the control button. The meter will return to the normal mode.
Temperature Compensation Adjustment
When is shown on the display, press and hold the control button. The factory default
‘0.0’ value will flash. Turn the compensation potentiometer clockwise to increase the temperature offset or counterclockwise to decrease offset). The range is ‐5.4°F to +5.4°F (‐
3.0°C to +3.0°C). When done, press and hold the control button to save the setting. The meter will return to the normal measurement mode and will reflect the offset when temperature readings are displayed.
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Relative Humidity Compensation Adjustment
When is shown on the display, press and hold the control button to enter the relative 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.
Warning: While performing the compensation adjustments, do not touch the sensor, as accuracy may be lost when adjusting the temperature values.
Warning: While performing temperature or RH% compensation adjustments do not touch the slotted openings on the meter housing, these are where the sensors are located.
Otherwise, accuracy may be compromised.
Change Formaldehyde Unit (ppm or mg/m 3 )
When is shown on the display, press and hold the control button to enter the unit selection mode. Choose the units (ppm or mg/m 3 ) by momentarily pressing the control button. Once the desired units are chosen, press and hold the control button to save the setting. The LCD display will return to the normal measurement mode.
Beeper Activate or Inactivate Selection
When is shown on the display, press and hold the control button to enter the alarm
(beeper) setting mode. Momentarily press the control button to toggle the beeper condition ON or OFF. Once selected, press and hold the control button to save and return to the normal mode of operation.
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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. If the meter is low on battery voltage, erratic or inaccurate readings may result. Never use the meter with the low battery icon displayed.
The battery compartment is on the back of the instrument. Slide the battery compartment cover off of the meter to access the batteries. Replace the 4 AAA batteries observing proper polarity and replace the compartment cover before switching the meter ON.
Battery Safety Reminders o Please dispose of batteries responsibly; observe local, state, and national regulations. o Never dispose of batteries in a fire; batteries may explode or leak. o
Never mix battery types; install new batteries of the same type.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection sites, the retail store where the batteries were purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end‐of‐life devices to a designated collection point for the disposal of electrical and electronic equipment .
Display Error Codes
The following errors may appear on the display:
E‐1: HCHO readings are outside of the specified measurement range
E‐2: Temperature readings are outside of the specified measurement range
E‐3: Relative Humidity (RH %) readings are outside of the specified measurement range
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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
Formaldehyde CH
2
O (HCHO) measurement range 0.00 to 5.00ppm (mg/m 3 )
HCHO accuracy ±5% of reading +0.03ppm (baseline drift)
Air Temp. Measurement range
Air Temperature Resolution
Accuracy Note: Accuracy meets NIOSH acceptance criterion within
±25% of the true value at 95% confidence level
0°C to 50°C (32°F to 122°F)
0.1°C (0.1°F)
Air Temperature Accuracy
Relative Humidity range
RH Resolution
Relative Humidity Accuracy
Power
±1.0°C (1.8°F)
20 to 90%RH
1% RH
±5%
AAA batteries x 4 pcs or universal AC adaptor (included)
Meter dimensions
Weight
113 x 108 x 53mm (4.4 x 4.3 x 2.1”)
159g (5.6 oz.)
Sensor Cross Sensitivity table
Substance
CO
H2S
H2
SO2
Cross Sensitivity (%)
1
No Data
0.1
12
NO2
NO
CL2
C2H4
NH3
CO2
Ethanol, methanol
Phenol
Water Vapor
No Data
No Data
‐3
No Data
0.0
0.0
50
7
0.0*
*NB: Within specified range. Step changes in %RH produce short term transient response
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All rights reserved including the right of reproduction in whole or in part in any form
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