Sensor Wiring
Modline 5
71
The input can also be used for remote Laser operation.
Example for Emissivity:
A 4 mAdc signal corresponds to an emissivity setting of 0.100. A 20 mAdc corresponds to an
emissivity of 1.000. The relationship for the values in between is linear.
Example for E-Slope:
For the E-Slope settings, the 4 to 20 mAdc signals correspond to settings of 0.800 to 1.200. The
relationship for the values in between is linear.
Connections are made to Terminals mA In + and mA In –. Input impedance is 120 Ohms. Use Shielded
cable at the TSP Terminal Strip Plate ground terminal.
The (–) terminal of the mA input current input is isolated, but will only tolerate a difference of
approximately 2 Volts between it and Sensor Common.
Remote Laser Operation is selected in COMMS – LASR Menu. See manual Sections
and
selecting and operating this function. To configure and wire for remote I IN current/switch Laser
operation follow the instructions given below. When selected for remote Laser Operation, Emissivity
and E-Slope are not changed by the input current.
4.7.8
Current Input Terminal Connections for Remote Laser
Use a DC power supply with a maximum output of 24 volts. Maximum input current allowed is 20 mA.
Overloading the input can cause a Sensor Fail alarm.
When calculating a series resistor value to use with a supply voltage, subtract the 120
ohm Sensor internal circuit impedance from the calculated value. See Table below. On
threshold is 15 mA.
DC Voltage Supply
Resistor Value
10 Volts
560 ohms (Plus 120 Internal = 680 ohms total) for 15 mA
24 Volts (Can be Sensor Supply)
1500 Ohms (Plus 120 Internal = 1620 ohms total) for 15 mA
Table 16
Connect the supply circuit as shown in the wiring diagram. The I IN – terminal can be connected to a
floating or earth grounded power supply terminal. In either case, it must be connected directly to the
power supply.
Mount the ½ Watt resistor in a series circuit on the switch or at the external power supply location.
Figure 64
Orange
Orange/White
Remote
Laser Switch
1/2 Watt
Resistor
