ENMET Formaldemeter htV - Manual (Page 5)

Formaldemeter htV ENMET Corporation
3
Front View Back View
Figure 1: Features of the Formaldemeter
™ htV
3.0 Technical Information
3.1 Principle of Operation
Electrochemical formaldehyde sensor
The
Formaldemeter
™ htV uses proven electrochemical sensing technology for determining the concentration of formaldehyde
in air samples. The instrument contains an electrochemical formaldehyde sensor comprising two noble metal electrodes and a
suitable electrolyte.
When air is drawn into the sensor by means of the internal sampling system, a small voltage is generated which is directly
proportional in magnitude to the concentration of formaldehyde in the sample.
This voltage is produced as a result of the electrooxidation of formaldehyde at one of the catalytically active electrodes.
The signal is fed to a precision electronic amplifier and output on the instrument’s display, when calibrated, as formaldehyde
concentration in ppm (parts-per-million by volume).
All the electronic systems are based on modern, integrated circuitry employing the latest surface mount technology to ensure
that the
Formaldemeter
™ htV is an exceptionally robust and reliable instrument.
Battery
Compartment
Serial No.
ppm
Sample
Cal.
0.00
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tV
Display
Keypad Area
Sampling Port
Serial Port
ON-OFF
Button