Your instrument might be fitted with a Brass or Stainless Steel Control Valve. The procedure to make this adjustment is similar but requires a different tool. Look at the Control Valve on your instrument. If it is made of Brass – use this tutorial if it is made of Stainless Steel – click here for the Stainless Steel tutorial.
The Control Valve is the valve that directs the flow of nitrogen from CHAMBER / OFF / EXHAUST. This valve will require periodic adjustment. If a leak is in the control valve, the symptoms are generally a continual flow of gas into the chamber even while the instrument is in the OFF position. To correct this, follow the instructions below:
You will need only one tool for this- a Valve Adjustment Tool. This tool was provided with your instrument when you originally purchased it. If you have misplaced it you can purchase another one from PMS Instrument.
CAUTION: Do not over tighten the valve packing, as permanent damage will result. Remove wrench, reinstall the black handle so that it points to the “off†position, and tighten the set screw in the handle. Over tightening can additionally make the valve too tight to function normally.
Note: If the instrument is used over a wide range of temperatures, some adjustment may be needed due to thermal expansion within the valve; this is normal.
