Extech FM300 Operating Manual
User Manual
Desktop Formaldehyde HCHO (CH2O) Meter
Model FM300
Additional User Manual Translations available at www.extech.com
EXTECH INSTRUMENTS
Introduction
Thank you for selecting the Extech Instruments Model FM300, this meter was designed with
electrochemical vented ball sensor technology for quickly detecting HCHO or CH2O gas. 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) to check for the latest version of this User Guide,
Product Updates, and Customer Support.
Features
• Large four-tiered LCD Simultaneously displays Formaldehyde concentration, Air Temperature,
and Relative Humidity with Date and Time
• Desktop style with audible HCHO (CH
• Three display (face) icons for HCHO (CH
• Latest smart technology for measuring HCHO (CH
O) alarm
2
O) concentration level (good , fair or poor)
2
O) concentrations
2
• Easy to use, intended for indoor air quality purposes
• Bright LED representing Recording mode (Green light) and Alarm trip (Red light)
• TWA (8 -hour time-weighted average) and STEL (15-minute short term exposure limit)
• 99 data point memory (01-99) with recall and clear functions
• Min/Max utility shows highest and lowest readings at a glance
• User adjustable HCHO concentration Alarm limit (default 0.08 ppm)
• Electrochemical HCHO sensor, measures concentrations up to 5.00 ppm
• Includes Universal AC adaptor (100-240V) for US, EU, UK, and AUS plug types
2 FM300-en-GB_V1.9 3/17
EXTECH INSTRUMENTS
Meter Description
Button Description
SET Button:
Set date and time
Audible Alarm ON/OFF (SET + MODE)
Alarm Limit Adjustment
Short press to switch AM/PM
SEL/Recall Button:
Move to next digit
Short press to save current reading
Press and hold to recall stored reading
o
C - oF - %RH ▲Button:
Increase a value
Press and hold to switch temperature units
MODE ▼Button:
Decrease a value
Review Maximum and Minimum reading
Review TWA-STEL
Meter Description
1. Top LCD display for HCHO (CH
2. Middle LCD display for RH% and temperature readings
3. Bottom LCD display for Time and Date
4. LED indicator light (Red, Orange, Green)
5. Push-buttons (detailed above)
6. Power adaptor jack
LED Indicator Description
Each time a reading is manually stored, the LED flashes green
When the high alarm is tripped, the LED flashes red and the audible beeper sounds
O) ppm readings
2
3 FM300-en-GB_V1.9 3/17
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