What is the cause of the 'Reagent Pressure Low' alarm on a new 9610sc silica analyser fitted with the new bottles and caps?

Document ID

Document ID TE8579

Published Date

Published Date 02/10/2017
Question
What is the cause of the 'Reagent Pressure Low' alarm on a new 9610sc silica analyser fitted with the new bottles and caps?
Summary
9610 sc silica Reagent Pressure Low alarm when new reagent bottles and caps added
Answer

The error indicates that the pump is turning on too often which is generally the result of an air pressure leak, but can also be a loss of pressure via the reagent delivery lines.
 

Firstly check that the caps, bottles and associated tubing installed are all the new style (opaque bottles and not the older clear plastic bottles).
 

Remove the caps from the bottles and ensure that the black o ring is seated correctly within the bottle cap on all bottles.

 

Ensure the cap to tubing fittings above the bottle caps are tightened (these need to be substantially tight enough to keep the pressure), they arrive from the factory typically loosened.

 

If the pressurised  /reagent delivery tubing has been replaced completely ( rather than just the caps), the tube fittings to valves and pressure manifold need to be substantially tight ( utilisation of the fitment tool within a yearly service kit), this is a common place for leakage in pressure.

 

Some basic fault-finding can be undertaken by taking the following actions:

 

1, Remove the reagent and standard bottles

2, Using a stopper or cable tied rubber tubbing block off all pressure inlet orifices within the head of the cap ( simulating bottles being installed)

3, With the door closed, navigate through to AIR PUMP within diagnostics

4, Ensure that the reagent pressure can be held ( you may see *****.****) this is just a over pressurisation due to no bottle installed.

5, If the pressure is held then one by one re introduce the bottles to establish where the leak is.

6, If a bottle is found to be causing the leak, this could be an issue either with the pressure input to the bottle or a leak with the delivery of reagents into the valve.


I f all new bottle caps and fittings to the cap are checked and found tight then check any tubing connections to the air manifold, then the copper overpressure relief part of the air manifold and the pressure relief valve.
 
Ensuret all tubes connected to the air manifold are tight.
On the old style air manifold there is a copper overpressure relief part on top, see below marked with arrow:


Unscrew and check that there is no corrosion on the thread.  If there is corrosion the complete air manifold needs to be replaced (due to a design change with the connectors).
The new air manifold has wider dimensions and the copper overpressure relief part is no longer needed (order code 6773000).

The pressure relief valve has the order code 6783700.
Also the pressure relief valve needs to be checked. It is located in the lower part of the cabinet near to the air manifold, see below: