PureAire Monitoring Systems, Inc.
12
4: Normal Operation
The
Air Check
O
2
monitor is a single point monitor designed for the continuous detection and
measurement of ambient oxygen concentration levels.
4.1 Signal Outputs
The
Air Check
O
2
monitor outputs a continuous 4-20 mA analog signal proportional to the
measured concentration of oxygen. 4 mA represents 0% O
2
and 20 mA represents 30% O
2
which is the
full range. In the event of a system fault, a specific factory defined code will be displayed on the local
digital display. This code will indicate the exact nature of the system fault.
CAUTION
: DO NOT connect to a powered current loop receiver. The Air Check
Oxygen monitor supplies the current loop power.
4.2 Instrument Faults
The
Air Check
O
2
monitor
incorporates a number of self-checking features to
ensure reliable operation. In the event that a fault condition is detected, the
analog output signal is altered: A few common error codes are displayed in the
following table:
Condition
Analog Signal
**Supply Voltage Out of
Range Fault code 16
Analog output drops to 2 mA
Transmitter cable cut
Analog output drops to 0 mA
O
2
Cell complete failure
Fault Code 128
Analog output drops to 2 mA
Fault Relay activates
(Available with Relay Option Only)
O
2
System Warm Up
Analog output drops to 2 mA
Fault Relay activates and turns off when system
is in the Oxygen operation mode
(Available with Relay Option Only)
O
2
Cell voltage fault
Fault Code 64
Analog output drops to 2 mA
Fault Relay activates
(Available with Relay Option Only)
EEPROM Fault 08
Analog output drops to 2mA
NOTE:
If a Fault condition clears itself, (Yellow LED is no longer illuminated)
The Fault message will continue to scroll until manually cleared.
To clear the fault message,
push the
joystick down (- Minus)
NOTE
:
All system faults are displayed on the front panel. Each fault
has it’own specific code to identify the specific problem. Please
contact PureAire whenever a fault is displayed.
** When using your own power supply please insure that the voltage
is regulated to 24VDC +/- 0.5 volts. If the voltage is too low or high
you will activate a “Supply Voltage Out of Range fault and disable
the monitor.
