Electrical Connections - Prosense PQ Series Installation And User Manual

Electrical connections

Caution: All electrical connections should be made in accordance with any relevant local or
national legislation, standards or codes of practice.
Prosense detectors can operate between 12 - 24 VDC. The connection socket located on
main board as given in Diagram-11 (page 19) and details given in below table 2:
The detector designed to give 4 - 20 mA current output signal. It is also possible to get
voltage value via using an additional resistor. Below Table-3 gives recommended resistor
specifications to get correct voltage output from detector depending of the desired signal
level:
Detector Power VDC
12 VDC – 24 VDC
12 VDC – 24 VDC
Please consider the cable length when performing installation in the field. The Prosense
detector requires a power supply between 12VDC and 24VDC. Make sure that a minimum 12
VDC supply available at the detector entrance and consider the voltage drop due to cable
resistance in case of long distance applications. The maximum loop resistance in the field
cable is calculated as follows:
R loop = (V controller – V detector min) / I detector
Example;
The controller or power supply is supplying a nominal 24VDC (V controller), the detector
minimum allowable voltage is 12VDC (V detector min), therefore the maximum allowable
voltage drop between the controller and detector is 12VDC; this means a voltage drop of 6V
in each core (V+ core and V- core).
PRS-UM-PQ-EN-Rev.05-18.06.2020
Output Usage
V + Power input (+) 12VDC – 24VDC
V - Power input (-) 12VDC – 24VDC
S Current Output Signal (4mA – 20mA)
Table 2: Detector output ports and their usage
Resistor
250 Ω, tolerance %1
500 Ω, tolerance %0,1
Table 3: Detector power and the output resistor
Diagram 7: Field cabling
Signal level (4mA – 20mA)
1 VDC – 5 VDC
2 VDC – 10 VDC
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