Rs485 Serial Communication Output; Relay Outputs - Prosense Safevader Series User Manual

Please avoid any interruption in case any junctions on wires. The shield is to be grounded from
the control panel side only and never connect the shield to the detector. Please make sure
clutching or crimping apparatus are not loosened or oxidized.
The analogue signal output levels can be adjusted in predefined range given below:
Status
Fault
Warm-up
Calibration mode
Normal gas measurement
Overrange

RS485 serial communication output:

Prosense SAFEVADER series detector has RS485 serial communication output on main board.
User should prepare two wire additional cables when RS485 communication used. To use the
detector with RS485 serial communication, a four-wire connection should be done which are
energy input (V +, V-) ports and RS485 (A, B) ports. If both analog current output and RS485
serial communication terminals are to be used at the same time, a five-wire connection must
be made to connect the terminals on both sockets (V +, V-, S, A, B). The total length of the
connection line should not exceed 800 meters. The wiring for detectors utilized with RS485
board should be done by using connection cable EIA RS485 2 core wires with section 0.22 / 0.35
mm2 and shielded. Nominal capacity between the wires should be < 50pF/m and nominal
impedance 120 Ohms.
Detectors will be wired in daisy chain (bus) mode. We recommend not using star mode
connection due to negative impact of interference. Each detector should have unique address
number in the chain. The detectors would not be recognised by control panel if same address
given to them. The address of detector can be adjusted via using display menu. Detectors can
be assigned to use addresses from 1 to 247 (including 247). Address zero (0) cannot be used by
detectors.

Relay Outputs:

Prosense SafeVader detectors have three relay outputs to generate switching output in case of
Fault and defined level adjustable two alarms named as Alarm-1 and Alarm-2. The relay outputs
set to NO (Normally Open – De-Energised) position at factory. All relays use same common port
marked with C label and all common connections are shortcircuited.
The Fault relay is set to NO (Normally Open – Energised). It will be de-energized in case of power
failure. This helps user to easily identify any power outage on detector side.
The alarm levels are also adjustable via using menu steps on display.
For oxygen detectors Alarm 1 Relay output predefined to alert Low level Oxygen status and
Alarm 2 Relay output predefined to monitor High level Oxygen status.
PRS-UM-SV-EN-Rev1.0-16.12.2022
Value/Setting
1 mA to 3 mA
1 mA to 4 mA
1 mA to 4 mA
4.0 mA to 20.0 mA
21.0 – 22.0 mA
Table 4: Detector default configuration details
Default Setting
2.0 mA
3 mA
3mA
4.0 mA to 20.0 mA
22.0 mA
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