User guide

Spectrex Inc. - SharpEye
TM
ML & MU Flame Detector Manual – TM 767100, Rev. A, April 2005
19
5.Technical Specifications
5.1 Electrical Specifications
A. Operating Voltage: 18-32 VDC
B.
Power Consumption
:
Max. 35mA in Stand-by
Max. 80mA in Alarm
C. Electric input protection: The input circuit is protected against voltage-
reversed polarity, voltage transients, surges and spikes according to
MIL-STD-1275A.
D. Electrical outputs
•
Dry Contact Relays
:
Table 8: Contact Ratings
Relay
Name
Type Normal
position
Maximum Ratings
Alarm SPST N.O. 2A at 30VDC or 0.5A at 250 VAC
Fault * SPST N.C. 2A at 30VDC or 0.5A at 250 VAC
* The FAULT relay will be normally energized closed during normal operation of the
detector. The contact will be open at Fault condition or low voltage.
•
4-20mA Current Output
:
The 4-20mA is isolated sink option.
The maximum permitted load resistor is 600Ohm.
STATE 20/20ML Output (mA) 20/20MU Output (mA) To
FAULT 0 0 +0.5mA
BIT FAULT 2 2 ±10%
NORMAL 4 4 ±10%
IR Detect 8 - ±5%
UV Detect 12 - ±5%
WARNING 16 16 ±5%
ALARM 20 20 ±5%
•
Communication Network:
The detector is equipped with an RS-485 communication link that can be
used in installations with computerized controllers. The communications
protocol is Modbus compatible.
 This protocol is a 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 Spectrex detectors or
other Modbus devices to the same Network.