Figure 10-13: Location Of Relay Board Status Led's; Table 10-1: Relay Board Status Led's - Teledyne 300E 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 (see Figure 6-8). They
are:
LED Color
D1 RED
D2 YELLOW
D3 YELLOW
D4 YELLOW
D5 GREEN
D6 GREEN
D7 GREEN
D8 GREEN
174
Table 10–1: Relay Board Status LED's
Function
Watchdog Circuit
Wheel Heater
Bench Heater
Spare
Sample/Cal Gas
Valve Option
Zero/Span Gas
Valve Option
Shutoff Valve
Option
IR SOURCE
STATUS LED's
RELAY PCA
PN 04135

Figure 10-13: Location of Relay Board Status LED's

Model 300E Carbon Monoxide Analyzer
Status When Lit
Cycles On/Off Every 3 Seconds under direct control of the
analyzer's CPU.
HEATING
HEATING
N/A
Valve Open to CAL GAS
FLOW
Valve Open to SPAN GAS
FLOW
Valve Open to CAL GAS
FLOW
Source ON
DC VOLTAGE TEST
POINTS
Instruction Manual
Status When Unlit
NOT HEATING
NOT HEATING
N/A
Valve Open to SAMPLE GAS
FLOW
Valve Open to ZERO GAS
FLOW
Valve CLOSED to CAL GAS
FLOW
Source OFF
P/N 04288 Rev: A