PT495 Series Detector
(Ultra1000)
Rev 5.11
22
Adjusting or Resetting Zero Only
Sensor zero can be adjusted or re-adjusted without affecting the calibration
previously performed. This may be necessary when sensor has drifted over a
period of time or simply to re-adjust the zero setting of the previous calibration.
To adjust the zero only follow steps below.
1.
Make sure the sensor and the surrounding are clear of any toxic and HC
gases. Apply zero air to remove any gas from the sensor housing if
necessary
2.
Using the magnetic wand / calibration magnet initiate the calibration
mode.
3.
After the ** Sensor Calib ** mess on the LCD the * Adjusting Zero *
message is displayed. At that time place the magnet against the cover at
4 o’clock position as shown in figure 8.
4.
Hold the magnet till the LCD displays * Zero Adj OK *. Remove the
magnet. Sensor will return to normal operation.
Response
Check
/ Bump Test
It is recommended to periodically carry out a gas response check or “Bump
Test” on the detector to ensure proper operation.
1.
For a simple Bump Test apply the gas to the sensor via the tube fitting /
nozzle on the bottom of the splash / dust guard. If there is no hose fitting on
the dust / splash guard then simply insert the tubing into the hose entry on the
bottom of the splash guard.
2.
A more accurate way is to use the calibration adapter. Simply remove the
splash guard and attach the adapter onto the sensor head assembly.
Note: In windy conditions perform Bump test as described in step 2 only. Also
calibration adapter must be used for full calibration of the sensor.
