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ENVIRONMENTAL SENSOR TECHNOLOGY CO. INC.
silicone gel; when using it, you should only take the soft silicone and please apply silicone gel
on it after the calibration). If you don’t want hardware calibration, you could press the relevant
button to enter the menu-calibration mode in the detection state to realize the calibration of the
concentration of the gas with software.
1. Hardware Zero Calibration
Power on the instrument for 30 minutes in clean air or pure nitrogen (the power on time of
polarization during the first use of the instrument should be over 2 hours). After the display is
stable, open the battery cap and adjust the zero calibration potentiometer in the instrument with
the screwdriver to make the value displayed on the LCD to be 0, which means that the
calibration is succeeded.
2. Hardware Gain Calibration
Import the standard gas of known concentration through the flow-meter, reducing the voltage
to 1.1 times of the normal atmospheric pressure and controlling the flow rate within the range
of 300ml/min to 500ml/min, and then direct the gas to the sensor through gas pipe and
standard gas covering. After the display of the instrument is stable (in about 3-5 minutes),
check whether the displayed value is in conformity with the concentration of the standard gas
passed. If not, open the upper covering and adjust the span potentiometer of the outer covering
of the instrument to make the displayed value in the panel to be in conformity with the
concentration of the standard gas. After the adjustment, the gas could be stopped. Then see
whether the value of the instrument could be returned to zero quickly in clean air. Repeat the
above action and contrast the result with the last one. If the results are pretty much the same
(within the basic error range), the adjustment could be stopped and the standard gas could be
turned off and the calibration is ended. If not, the above calibration should be repeated again
till the result is satisfied.
3. Software Zero Calibration
The calibration condition is same with that of hardware zero calibration. Press the relevant
button to adjust the instrument to zero calibration condition (please refer to the 4
th
point of the
6
th
section for detailed method). After the display is stable, if the value displayed on the LCD
is not 0, adjust the instrument till it is 0. Press the Confirm to save the data and then complete
software zero calibration.
4. Software Gain Calibration
The calibration condition is same with that of hardware gain calibration. Press the relevant
button to adjust the instrument to gain calibration condition (please refer to the 4
th
point of the
6
th
section for the detailed method). After the display is stable (in about 3-5 minutes after
importing the gas), if the value displayed on the LCD is not in conformity with the standard
gas, adjust the value till it is in conformity with the concentration of the standard gas. Press the
OK to save the data. After the data is saved, the gas could be stopped. And then see whether
the value of the instrument could be returned to zero quickly in clean air. Repeat the above
action once and contrast the result with the last one. If the results are pretty much the same
(within the basic error range), the adjustment could be stopped and the standard gas could be
turned off and the calibration is ended. If not, the above calibration should be repeated again
till the result is satisfied and then software zero calibration is completed.
Remark:
Remark:
Remark:
Remark: the
the
the
the calibration
calibration
calibration
calibration is
is
is
is of
of
of
of great
great
great
great importance
importance
importance
importance and
and
and
and non-professional
non-professional
non-professional
non-professional technicians
technicians
technicians
technicians should
should
should
should
not
not
not
not operate
operate
operate
operate at
at
at
at random.
random.
random.
random.
