AVL 9180 Service Manual

62
CHECK REFERENCE HOUSING
At the beginning of a calibration, pressure is formed in the reference housing
while the R valve is closed and the V valve is open. After Standard A is
detected in the sample chamber, the back pressure formed in the reference
housing causes the Standard A solution to move back toward the sample
sensor. When the standard A solution is detected by the sample sensor, the R
valve is opened to release the pressure. If the sample sensor does not detect
standard A as it moves back, CHECK REFERENCE HOUSING will be
displayed.
Possible causes and remedies:
• Check for clogged reference housing and clean per monthly
maintenance procedures.
• Check and ensure that reference tubing is securely connected at the
tubing connector.
• Check for proper filling of the reference housing and ensure that
reference solution reagent level allows complete filling of the
reference housing.
• Check for bubble-free aspiration of Standard A.
PLEASE CLOSE SAMPLE DOOR (except 9181)
This message occurs and prints NO SAMPLE on the print-out, when either of
two conditions exists.
1. Sample door is not closed within 20 seconds after samples are in
place.
2. Sample door has been opened and no sample is detected within 20
seconds.
Possible causes and remedies:
• Close sample door within the time allowed.
• Check needle mechanism light gate.
• Check whether sample sensor is plugged in.

AVL 9180 Specifications

General

Brand	AVL
Model	9180
Category	Measuring Instruments
Language	English