2 range configuration jumpers, 3 polyswitch over-current protection – Detcon 12B User Manual

Page 14

Model 12B

12B Control Module Instruction Manual

Rev 1.4

Page 10 of 12

10.2

Range Configuration Jumpers

The applicable range of the 12B control module is factory set according to its corresponding sensor.
However, the control module range of detection can be changed if a particular application should warrant it.
Range selection is accomplished via configuration jumpers. Use the table below to determine the proper con
figuration. See Figure 1 for applicable jumper locations.

Range

CFG1 (JP11)

CFG2 (JP7)

CFG3 (JP8)

CFG4 (JP3)

CFG5 (JP4)

0 - 1.0

2 to 3

0 – 10

2 to 3

1 to 2

2 to 3

0 - 25 (O2)

1 to 2

2 to 3

0 – 25

2 to 3

1 to 2

2 to 3

0 – 50

1 to 2

2 to 3

1 to 2

2 to 3

0 - 10.0

1 to 2

2 to 3

0 - 25.0 (O2)

2 to 3

1 to 2

2 to 3

0 - 25.0

1 to 2

2 to 3

1 to 2

2 to 3

0 - 50.0

2 to 3

1 to 2

2 to 3

1 to 2

2 to 3

0 – 100

1 to 2

2 to 3

1 to 2

2 to 3

0 – 200

2 to 3

1 to 2

2 to 3

0 – 500

1 to 2

2 to 3

1 to 2

2 to 3

0 – 999

2 to 3

1 to 2

2 to 3

0 - 99.9

1 to 2

2 to 3

Table 2 Range configuration jumper locations and settings

10.3

PolySwitch Over-current Protection

Model 12B control modules incorporate PolySwitch over-current protection components that act as resettable
fuses. The PolySwitch circuit protector is a positive temperature coefficient resistor that undergoes a large,
abrupt change in resistance when an over-current or high temperature heats it above a specific point. Normally
just tens of milliohms, the resistance of the PolySwitch protector increases orders of magnitude when
switched. This increase limits current to several milliamps.

When the current or temperature fault that caused the device to switch has been substantially reduced, the
PolySwitch device resets, allowing normal circuit operation to resume. The protector requires no manual
resetting or replacement. Four separate PolySwitches monitor and protect the following circuitry: the 4-20 mA
signal input loop, the 4-20 mA output signal loop, the 24 VDC input power loop, and the 24 VDC output
power loop to the sensor.