Electrical Specifications - Emerson Rosemount 936 Reference Manual

Toxic open path gas detector
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Specifications
October 2021
Temperature range
-67 to 149 °F (-55 to 65 °C)
Immunity to false alarm
Does not produce a false alarm and is not influenced by solar radiation, hydrocarbon
flames, or other external infrared radiation sources.
4.2

Electrical specifications

Operating voltage
18-32 Vdc
Power consumption
Table 4-2: Detector and Source Maximum Power Consumption
Detector
Source
Electrical input protection
The input circuit is protected against voltage-reversed polarity, voltage transients, surges,
and spikes, according to EN50270.
Electrical outputs
0-20 mA current output: The 0-20 mA is an isolated sink option. You can also configure
this output as source (see
The maximum permitted load resistance is 500 Ω.
Communication network: The detector is equipped with an RS-485 communication
link that can be used in installations with computerized controllers.
Communication is compatible with the Modbus
HART
intelligent field instruments and the host system.
Through the HART protocol, the detector can:
26
Without heated optic (max.)
150 mA
200 mA
Wiring
This protocol is standard and widely used.
It enables continuous communication between a single standard Modbus controller
(master device) and a serial network of up to 247 detectors.
It enables connection between different types of Rosemount detectors or other
Modbus devices to the same network.
®
protocol: A digital communication protocol used to communicate between
Display setup.
Reconfigure setup.
Display and determine the detector status.
Perform detector diagnostics.
configurations).
®
protocol.
Reference Manual
00809-0100-4036
With heated optice (max.)
300 mA
300 mA
Emerson.com/Rosemount

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