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Gas Leaks
Use this table if you observe problems with the supply and delivery of Cal or
Slope Gas.
Problem Probable Cause and Solutions
Leaking or hissing of
gas
1. Locate the source of the leak by listening closely for
hissing around the regulators and gas tubing. Apply soapy
water around the regulator or the gas fittings on the reagent
manifold and look for bubbles.
NOTE: Do not apply any fluids to the area behind the reagent
manifold.
2. Ensure that the connections are tight.
3. If you find a leak in the tubing, replace the tubing as
described in Replacing the Gas Tubing in Section 3.
4. Check the regulators for leaks and replace if required.
5. Ensure the seal is in place between the gas tank and
regulator.
6. If the leak is between the gas tank and regulator, tighten
the yoke screw or replace the plastic seal.
7. Test the gas flow rate as described in Checking the Gas
Flow, page 4-64.
Troubleshooting the Sensors
Use this table if you observe problems with any of the sensors. Also refer to
Removing Obstructions from the Measurement Module, page 4-82
.
Problem Probable Cause and Solutions
More than one sensor
shows excessive drift
1. If the pH or ISE sensors show drift, check the reference
sensor for salt deposits and leaks.
2. If the gas sensors show drift, check the gas supplies.
Sensors with drift
also show reagent
problems
1. Correct the reagent problems in this order: D23, D24, and
D29.
2. Correct the drift problem (D2, D3, D4, or D5).