Oldham MX15, Инструкция по установке и эксплуатации, Страница: 15 / 22

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INDUSTRIAL SCIENTIFIC recommends:
Calibrate the sensor connected to the MX15 central unit at least once a year, then based upon
environmental conditions (T°, dust, vibrations etc.). It is also recommended to calibrate the detector
upon exposure to high gas concentrations.
Reminder: for safety purposes, only authorized and trained people are allowed
to use the following menus.
Procedure to be followed when the MX15 central unit is connected to an explosive gas sensor
(OLC10/CEX300, etc.):
- the TEST menu was validated (see above)
- remove the small cover on the front of MX15 to access the setting potentiometers
- adjust, if needed, the ZERO (read the display unit) using a zero potentiometer «O»
Reminder: make sure that you have clean air - otherwise inject air or nitrogen on the sensor
(with calibration kit) with a flow rate of 60 l/h, then wait for the stabilisation of measurement
- Now inject the standard gas (60l/h) on the sensor and wait for the measurement stabilisation
- Make sure that the gas concentration is correct by reading the display unit
- Otherwise, adjust the sensitivity using a “S” potentiometer
- Disconnect the standard gas cylinder
- Wait for the “return to zero” on the display unit
- Press the TEST key to exit this menu
- The yellow “DEL” is off and the display unit indicates an interrupted line
- Press one of the two keys + or – to display the measurement, if needed
- Position the small cover in place.
Procedure to be followed when a MX15 central unit is connected to a transmitter 4-20 mA
without local maintenance device (calibration position switch, etc.) :
- the TEST menu was validated to disable the relays of the central unit: see the beginning of
this chapter
- adjust the transmitter (see manual of relevant product)
- make sure that the transmitter instructions (O and S) match those of the central unit. Refine
the adjustments, if needed, of the central unit and, in this case, refer to the previous
paragraph
- upon completion of calibration, wait for the «return to zero» on the display unit of the
central unit
- Press the TEST key to exit this menu
- Yellow “DEL” is off and the display unit shows an interrupted line
- Press one of the two keys + or – to display the measurement, if needed.