TVOC 2 MANUAL
Ion Science Ltd
Page 9 of 32
Unrivalled Gas Detect
ion.
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Diagram 2
Diagram 3
Diagram 4
TVOC 2 Set-up
Selector Pins
TVOC 2 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 2 is shipped with all four of the selector pins fitted as shown in
Diagram 3.
Diagram 4 shows selector pin A removed.
The following table shows the selector pin combinations and the corresponding function.
a
= Selector pin fitted
r
= Selector pin removed
Selector pin
A
B
C
D
Range
Displayed units
a
a
a
a
1000
ppm (Default)
a
a
x
a
100
ppm
a
x
a
a
10
ppm
a
a
a
x
2280
mg/m
3
a
a
x
x
228
mg/m
3
a
x
a
x
22.8
mg/m
3
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
3
”
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 2 has a 100 ppm factory calibration
