Spectrex 20/20SH - Hydrogen Flame Detector - Manual (Page 26)

Spectrex Inc. - SharpEye TM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005
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E. Electrical outputs
• Dry Contact Relays:
Table 9: Contact Ratings
Relay
Name Type Normal
position Maximum Ratings
Alarm SPDT N.O. N.C. 2A at 30VDC or 0.5A at 250 VAC
Accessory SPST N.O. 5A at 30VDC or 250 VAC
Fault SPST N.C. 5A at 30VDC or 250 VAC
• 4-20mA Current Output:
Terminals 11 and 12:
STATE Output
FAULT 0 + 0.5mA
BIT FAULT 2mA±10%
NORMAL 5mA±10%
WARNING 10mA±5%
ALARM
15mA±5%
• Communication Network:
The detector is equipped with an RS-485 communication link that can
be used in installations with computerized controllers.
The communicator protocol is compatible with the Modbus
communicator protocol.
o This protocol is a standard and widely used.
o It enables continuous communication between a single standard
Modbus controller (Master device) and a serial Network of up to
247 detectors.
o It enables connection between different types of Spectrex detectors
or other
o Modbus devices to the same Network.