Extech Instruments FM300 User manual

User Manual

Desktop Formaldehyde HCHO (CH2O) Meter

Model FM300

Additional User Manual Translations available at www.extech.com

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EXTECH INSTRUMENTS

2FM300-en-GB_V1.9 3/17

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 (CH2O) alarm

•Three display (face) icons for HCHO (CH2O) concentration level (good , fair or poor)

•Latest smart technology for measuring HCHO (CH2O) concentrations

•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

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EXTECH INSTRUMENTS

3FM300-en-GB_V1.9 3/17

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

oC - 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 (CH2O) ppm readings

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

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EXTECH INSTRUMENTS

4FM300-en-GB_V1.9 3/17

Operation

POWER THE METER

Plug the AC adaptor into meter and receptacle to turn on the meter. Reset the date and time

each time the meter power is cycled. Remove the adaptor or switch off the AC power source to

shut down the meter.

GETTING STARTED

All LCD display lines will switch ON and the LED will glow orange when power is applied to

meter. The display will warm up to 5 or 10 minutes depending on air quality after which the

meter enters the normal mode.

In normal mode, the top display line indicates the current HCHO (CH2O) concentration in ppm,

the middle display line shows RH% and ambient temperature readings; the bottom LCD line

alternates between Date and Time.

If the measured HCHO (CH2O) concentration exceeds the user-programmable Alarm threshold

value when the meter is switched ON the LED light will flash red and the audible beeper will

sound (unless it has been disabled by the user). Press SET and MODE at the same time to silence

the alarm beeper.

When attempting to manually store the current HCHO reading, the LED light turns green for one

second and a short beeper tone will sound.

Toggle the displayed temperature units by press and holding the oC/oF/RH%▲button for 3

seconds.

SETTING THE DATE AND TIME

In normal operation, the meter alternates the date and time displays.

Short press SET to change AM/PM.

1. Press and hold SET for 3 seconds to see image at right.

2. Press ▼to decrease a number or press ▲to increase a number

3. Press SEL/RECALL to scroll through the YEAR-MONTH-DAY

4. When finished changing the Date, press SET to change the Time

5. Press ▼ to decrease number or press ▲to increase number

6. Press SEL/RECALL to scroll through HR-MIN-SEC

7. Press SET to access the alarm setting (see Alarm section).

8. To exit, press and hold SET for 3 seconds.

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EXTECH INSTRUMENTS

5FM300-en-GB_V1.9 3/17

MAX, MIN, TWA, and STEL READINGS

1. Press MODEto view the maximum reading since meter was powered (MAX icon appears)

2. Press MODE again to view the minimum reading (MIN icon appears)

3. Press MODE again to view the TWA (8-hour time weighted average) value

4. Press MODE again to view the STEL (15-minute short term exposure limit) value

5. Press MODE again to return to the normal measurement mode

6. To clear these readings: Enter the Maximum mode and, when the MAX Icon appears, press

and hold the SET button for 3 seconds, “Clr” appears for confirmation.

HCHO ALARM SETTING

1. Alarm default is ON.

2. Press and hold the SET button for 3 seconds to enter the setup mode

3. Press SET again to skip the Date setting (set the Date if desired per earlier instructions)

4. Press SET again to skip the Time setting (Set the Time if desired per earlier instructions)

5. Press SET again and a flashing “8” will display. Use the up ▲and down ▼ arrows to

increase/decrease the alarm threshold. Press SEL/RECALL to move to the next digit. There

are 3 digit places with a maximum setting of 5.00pm (0.08ppm is the default).

6. Press and hold SET for 3 seconds to save and return to the normal measurement mode.

While alarm is tripped, the LED will flash red even if “beeper audio off” is selected. To silence the

beeper when in an alarm condition, press SET and MODE at the same time. The red LED will

continue to flash, however, until the environmental HCHO level no longer exceeds the default

0.08ppm Alarm level or the user selected Alarm level. Remember to reactivate the beeper for

future use.

INTERPRETING THE FACE ICONS

The three face icons represent three HCHO measurement ranges:

Normal (<0.08ppm), Moderate (>0.08ppm, <0.80ppm), and

Unhealthy (>0.8ppm). The guide and table below are useful when

interpreting measurements for a variety of applications.

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EXTECH INSTRUMENTS

6FM300-en-GB_V1.9 3/17

MEASUREMENT COMPARISON TABLE

0.03 ppm Average outdoor level

0.10ppm Recommended upper limit for residences by ASHRAE, ANSI, EPA, NIOSH

Recommended upper limit for STEL

0.40ppm Recommended upper limit for manufactured homes

0.50ppm OSHA workplace limit

0.75ppm OSHA TWA limit

0.80ppm Level at which most people first detect odor

2.00ppm OSAL STEL limit

AUDIBLE ALARM BEEPER (ON / OFF)

To toggle ON-OFF the audible beeper: From the normal

measurement mode, press the SET + MODE▼button at the

same time. The LCD will show beeper icon when the beeper is

active. The Alarm beeper will sound (and the LED will flash red)

when the environmental HCHO level exceeds the default

0.08ppm Alarm level or the user selected Alarm level.

While alarm is tripped, the LED will flash red even if

“beeper audio off” is selected. To silence the beeper

when in an alarm condition, press SET and MODE at the

same time. The red LED will continue to flash, however,

until the environmental HCHO level no longer exceeds the

default 0.08ppm Alarm level or the user selected Alarm

level. Remember to reactivate the beeper for future use.

MANUALLY STORE/RECALL 99 HCHO READINGS

The FM300 can manually store an HCHO reading by pressing SEL/RECALL button (up to 99 can be

stored). The LCD shows the record number, 01-99. The number appears momentarily in the

humidity reading area. A short beep will sound each time a reading is stored.

To recall stored readings, press and hold the SEL/RECALL Button, the LCD shows the number of

the record with its HCHO reading, to scroll other stored readings press the ▲button or the ▼

button. Press and hold the SEL/RECALL Button to return to normal operation mode.

To clear stored data:

Enter the Recall mode and press and hold the SET button until “Clr “appears on LCD. The LCD

then automatically returns to the normal mode of operation.

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EXTECH INSTRUMENTS

7FM300-en-GB_V1.9 3/17

The illustration at left shows a manually recorded HCHO reading (reading number ‘05’ in this

case); the middle illustration shows the recalled HCHO reading; the illustration at right shows

HCHO readings cleared.

HCHO SELF-CALIBRATION

It is recommended that the meter be calibrated monthly in a clean air environment.

From the normal measurement mode, press and hold the

MODE▼button for at least 6 seconds to enter calibration mode.

The LCD shows CAL and counts down from 300 seconds. After

calibration is completed, the meter returns to the normal

measurement mode automatically.

NOTE:Power on the meter for 10 minutes at a location with good

ventilation. Ensure that no HCHO concentration is present in the

air while calibrating.

DISPLAY ERROR CODES

ER-1 (Temperature): If the Temperature sensor fails the error

code appears in the Temperature display area.

ER-1 (RH): If the RH sensor fails the error code appears in the RH display area.

ER-2: The measurement exceeds the range of the instrument. This could also indicate that the

meter is malfunctioning. Please contact Extech for service.

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EXTECH INSTRUMENTS

8FM300-en-GB_V1.9 3/17

Specifications

Measurements HCHO (CH2O) ppm, Temperature, RH%

HCHO range and resolution Measurement range 0.00 to 5.00ppm (0.01ppm)

HCHO Sensor Electrochemical type

HCHO Accuracy * ±25% + 0.03 ppm

Alarm alert Visual LED alarm and audible beeper alarm

Temp. range and resolution 0 to 50oC (32 to 122oF); 0.1 oC (0.1 oF)

RH% range and resolution 10 to 90 %RH (0.1%)

Temperature and RH% Accuracy ±1oC (2oF) Temperature; ±5% RH

Date and Time indicators Year, Month, Day, and Time (HR:MIN:SEC)

Response time < 30 seconds

Internal Memory 99 data point (01-99) store/recall/clear

MAX/MIN Record / Recall / Clear Stores highest reading since power start

Measurement analysis TWA/STEL modes

Power Universal AC adaptor (for 100 to 240VAC sources)

Dimensions 155 x 87 x 81mm (6.1 x 3.4 x 3.2”)

Weight 165 g (5.8 oz.)

*Accuracy Note: Accuracy meets NIOSH acceptance criterion within ±25% of the true value at

95% confidence level

Sensor Cross Sensitivity table

Substance

Cross Sensitivity (%)

H2S

No Data

0.1

SO2

NO2

No Data

CL2

-3

C2H4

No Data

NH3

0.0

CO2

0.0

Ethanol, methanol

Phenol

Water Vapor

0.0*

*NB: Within specified range. Step changes in %RH produce short term transient response

ISO-9001 Certified

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