MKS Baratron 631D, Instruction Manual, Page: 49 / 64

Chapter Four: Operation
41
150 185
200 230
Table 8: Over-Temperature Cutoff Value
Conditions Determining Status LEDs and
Relay Output
At Temp
Status
LED
Htr Fail
Status
LED
State of Heater
Alarm Relay
Contacts
1. Power ON
2. Temp below lower limit of LED temperature window
3. Heater current ON
Yellow Off
Energized
Pin 13: Open
Pin 14: Closed
1. Power ON
2. Temp below lower limit of LED temperature window
3. Heater current OFF
Yellow Red
De-energized
Pin 13: Closed
Pin 14: Open
1. Power ON
2. Temp within LED temperature window
3. Heater current ON or OFF
Green Off
Energized
Pin 13: Open
Pin 14: Closed
1. Power ON
2. Temp above upper limit of LED temperature window
3. Temp below overtemperature cutoff
4. Heater current ON
Yellow Off
Energized
Pin 13: Open
Pin 14: Closed
1. Power ON
2. Temp above upper limit of LED temperature window
3. Temp below overtemperature cutoff
4. Heater current OFF
Yellow Red
De-energized
Pin 13: Closed
Pin 14: Open
1. Power ON
2. Temp above overtemperature
3. Heater current ON or OFF
Yellow Red
De-energized
Pin 13: Closed
Pin 14: Open
1. Power OFF Off Off
De-energized
Pin 13: Closed
Pin 14: Open
Table 9: Conditions and resulting status LEDs and heater alarm relay output.