PT495 Series Detector
(Ultra1000)
Rev 5.11
20
7.
The microprocessor waits 60 seconds for the user to apply the calibration gas
while flashing the display approximately twice every second. Attach the
calibration adapter to the sensor head assembly and turn the gas on. When
the flow of the gas is detected by the sensor the display flashing rate will slow
down to once every second. If no gas is detected within 60 seconds the
sensor aborts calibration and will display error message
“Calibration Time
Out”
for few seconds before returning to normal operation..
8.
Apply the calibration gas for about 2 minutes.
9.
After 2 minutes the sensor will display
Adjustng
for 5 to 15 seconds while
making adjustments and recording the calibration data into memory. When
completed the display will starts flashing rapidly. At this time remove the
calibration gas and allow the sensor to clear.
Do not remove the calibration
gas while the sensor is adjusting. Remove the gas only when the adjustment
is completed and the display is rapidly flashing with calibration gas value.
10.
After successful calibration “
Calibrat OK
” message is displayed for few
seconds on the LCD.
11.
While the gas from the sensor head assembly is being cleared the 4-20mA
analog output will be held at 2.0mA and alarm relay will not be activated until
the sensor has cleared. Once cleared the unit will return to its normal
operation. The 2mA level on the analog output line is an indication to any
connected gas monitor that the sensor is in calibration mode thus avoiding
any false alarm.
Also refer to
“Sensor calibration Flow Chart
” for quick calibration review and
“Calibration Error and remedies”
