Teledyne 400E - Table 10-1: Relay Board Status Leds

THEORY OF OPERATION Model 400E Ozone Analyzer
Instruction Manual
232 P/N 04316 Rev: B
Status LED’s
Eight LED’s are located on the Analyzer’s Relay board to show the current status on
the various control functions performed by the Relay Board. They are:
Table 10-1: Relay Board Status LED’s
LED Color Function Status When Lit Status When Unlit
D1 RED Watchdog Circuit
Cycles On/Off Every 3 Seconds under direct control of the
analyzer’s CPU.
D2
1
YELLOW
Metal Wool
Scrubber Heater
HEATING NOT HEATING
D3 YELLOW Spare N/A N/A
D4 YELLOW Spare N/A N/A
D5 YELLOW Spare N/A N/A
D6 YELLOW Spare N/A N/A
D7 GREEN
Zero/Span Gas
Valve
Valve Open to SPAN GAS
FLOW
Valve Open to ZERO GAS
FLOW
D8 GREEN
Measure/Ref
Valve
Valve Open to REFERENCE
gas path
Valve Open to MEASURE gas
path
D9 GREEN
Sample/Cal Gas
Valve
Valve Open to CAL GAS
FLOW
Valve Open to SAMPLE GAS
FLOW
D10 GREEN Spare N/A N/A
D11 GREEN Spare N/A N/A
D12 GREEN Spare N/A N/A
D13 GREEN Spare N/A N/A
D14 GREEN Spare N/A N/A
D15 GREEN
Photometer UV
Lamp Heater
HEATING NOT HEATING
D16 GREEN
IZS O
3
Generator
UV Lamp Heater
HEATING NOT HEATING
Watch Dog Circuitry
Special circuitry on the Relay Board watches the status of LED D1. Should this LED
ever stay ON or OFF for 30 seconds, the Watchdog Circuit will automatically shut of
all valves as well as turn off the UV Source(s) and all heaters. The Sample Pump
will still be running.