Calibrating The Unit; Setting Up The Unit - Dräger Polytron 7500 Instructions For Use Manual

Maintenance

Calibrating the unit

— Ensure that the sensor is warmed up before it is calibrated. Warming-up time: see
the Instructions for Use for the DrägerSensor.
— The Polytron 7500 can be calibrated by the operator on site.
— For critical applications, the calibration intervals are to be defined in accordance
with the recommendations in EN 50073
tions.
Note the calibration sequence!
First check the zero point and calibrate it if necessary, immediately after this,
check the sensitivity and adjust it as necessary.
— Never calibrate the sensitivity before calibrating the zero point.
— Calibration cannot be carried out if the date and time are not set.
Setting the date and time, page 48.
— Calibration menu, page 41 to page 39
— Zero gas and calibration gas: See the related information in the Instructions for
Use for the DrägerSensor.
Caution:
Calibration gas must not be inhaled. Risk to health!
Care must be taken about the risks which can arise when using test gas; hazard
instructions and safety advice must be observed.
For details, see appropriate Safety Sheets.

Setting up the unit

Individual settings can be made:
— via the keypad in menu mode
— via the HART interface,
— with the Dräger Hand Held Terminal (DHHT)
Note:
After setting up the unit automatically with the copy function of the Dräger
Hand Held Terminals, the plausibility of the settings must be checked.
1)
EN 50073 – Guidelines for selection, installation, use and maintenance of devices for the
detection and measurement of flammable gases and oxygen.
2)
EN 45544-4 – Electrical devices for the direct detection and direct concentration measure-
ment of toxic gases and vapours – Part 4: Guidelines for selection, installation, use and
maintenance.
Page 22 of 72 Pages
1) 2)
or. EN45544-4 and national regula-
9023927 - 2nd edition - May 2007