Ion-science TVOC Manual de usuario descargar pdf (Pagina 9)

TVOC MANUAL Ion Science Ltd

Page 9 of 32

Unrivalled Detection. www.ionscience.com

Diagram 3

TVOC setup

Selector Pins

TVOC has a number of settings that can be selected by the

user via a row of four selector pins mounted on the reverse side

of the main PCB. Diagram 2 shows the location of the functional

selector pins labelled - A, B, C & D.

The selector pins absence or presence determines the chosen

setting.

TVOC is shipped with all four selector pins fitted as shown in

diagram 3.

Diagram 4 shows the removal of 1 selector pin.

The following table shows the selector pin combinations and the corresponding function.

= Selector pin fitted  = Selector pin removed

Selector pin

A B C D Range Displayed units

    1000 ppm (Default)

  x  100 ppm

 x   10 ppm

   x 2280 mg/m

  x x 228 mg/m

 x  x 22.8 mg/m

Selector pin ‘B’ and ‘C’ selects the ranges - 10 ppm, 100 ppm or 1000 ppm

Selector pin ‘D’ selects the units - ppm’ or ‘mg/m

Selector pin ‘A’ - Fault output range

NOTE: During an Alarm condition (F1 or F2) the output will drop to either 3.5 mA or 2.0 mA.

Jumper ‘A’ fitted: 3.5 mA during an alarm condition

Jumper ‘A’ removed: 2.0 mA during an alarm condition.

As default, the TVOC has a 100 ppm factory calibration

Diagram 2

Diagram 4

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Ion-science TVOC Manual de usuario Pagina 9