Yokogawa 212 Heat Calculator User Manual
Page 59
6.5 ALARM RELAY OUTPUTS
Note that the High/Low alarms are not available when the 4-20mA output option
is installed.
Two Solid State dc relays are provided as alarm outputs. These relays are fully
isolated and can be used to drive external relays, lamps, audible alarms, etc.
Output characteristics for Relay 0 and Relay 1 are:
Maximum Voltage
30 Volts dc
Maximum Current
250mA dc
Off State Leakage Current
5uA maximum
On State Resistance
6 ohms maximum
The relays can be individually programmed during Set-up to alarm on:
Flow rate
Low or High
Power
Low or High
Feed Temperature
Low or High
Return Temperature
Low or High
Temperature Difference
Low or High
Input & Output Connections 57