Table 10-1: Relay Board Status Led's - Teledyne 400E Instruction Manual

THEORY OF OPERATION
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:
LED Color
D1 RED
1
D2 YELLOW
D3 YELLOW
D4 YELLOW
D5 YELLOW
D6 YELLOW
D7 GREEN
D8 GREEN
D9 GREEN
D10 GREEN
D11 GREEN
D12 GREEN
D13 GREEN
D14 GREEN
D15 GREEN
D16 GREEN
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.
232

Table 10-1: Relay Board Status LED's

Function
Watchdog Circuit
Cycles On/Off Every 3 Seconds under direct control of the
analyzer's CPU.
HEATING
Metal Wool
Scrubber Heater
Spare N/A
Spare N/A
Spare N/A
Spare N/A
Zero/Span Gas Valve Open to SPAN GAS
Valve FLOW
Measure/Ref Valve Open to REFERENCE
Valve gas path
Sample/Cal Gas Valve Open to CAL GAS
Valve FLOW
Spare N/A
Spare N/A
Spare N/A
Spare N/A
Spare N/A
HEATING
Photometer UV
Lamp Heater
HEATING
IZS O Generator
3
UV Lamp Heater
Status When Lit
Model 400E Ozone Analyzer
Instruction Manual
Status When Unlit
NOT HEATING
N/A
N/A
N/A
N/A
Valve Open to ZERO GAS
FLOW
Valve Open to MEASURE gas
path
Valve Open to SAMPLE GAS
FLOW
N/A
N/A
N/A
N/A
N/A
NOT HEATING
NOT HEATING
P/N 04316 Rev: B