Spectrex Series 300 Open-Path Gas Detection System - Manual (Page 28)

Spectrex Inc. - SafEye TM 300 Gas Detector Manual – TM 794100, Rev. D, May 2004
20
4.2 Electrical Specifications
•
Operating Voltage: 18- 32 VDC
•
Power Consumption
Detector
150 mA @ 24 VDC (200 mA Peak)
Source 100 mA @ 24 VDC (220 mA Peak)
•
Electrical input protection:
The input circuit is protected against voltage-reversed polarity, voltage
transients, surges and spikes according to MIL-STD-1275A.
•
Electrical Interface (see figure 4)
•
Electrical outputs
A. 4-20mA Current Output:
The 4-20mA is source configuration. The maximum permitted load
resistance is 600 Ohm.
Two 4-20mA options:
•
Continuous reading - default (See Table 4)
•
Discrete reading (See Table 5)
B. Communication Network:
The Detector is equipped with an RS 485-communication link that can
be used in installations with computerized controllers. It enables
continuous communication with up to 64 Detectors.
C. Relays Output:
The Detector include up to three relays.
Table 13: Dry Contact Relays
Relay Type Normal Maximum Ratings
Alarm SPDT NO, NC 2A at 30VDC or 0.5 at 250 VAC
Accessory SPST NO 5A at 30VDC or 250 VAC
Fault * SPST NC 5A at 30VDC or 250 VAC
* Fault Relay is normally energized, the contact will be closed, and when it is in
Fault situation, the relay is opened.