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Functional Test of the GRAETZ Telescope Probe DE

(together with a dose rate meter GRAETZ  X 5 C plus
or predecessor model X 5 C / X 5 DE / X 50 DE)

A detailed knowledge of the device's operation instructions is absolutely necessary. The following maintenance steps should be carried out every 6 months.

• Visual control regarding damages on the outside of the instrument.


• Control the contact row for accommodating the basic unit. The contacts have to be non-corrosive and dry. When pressing the contacts they have to spring back.


• Remove the rubber protective cap at the end of the probe. The window beneath has to be undamaged. The rubber cap must be equipped with a steel plate. Put the cap again onto the probe head.


• Extend the telescope to its maximum length and clean it with a non fraying cloth. Grease the extended telescope with Vaseline.


• Slide-in the telescope again. The rubber wrapping at the end of the telescope shouldn't be cracked or damaged, otherwise tightness of the slided-in telescope is not guaranteed!


• Put the functioning - but switched off - basic unit onto the contact row of the Telescope Probe.


• Switch the basic unit on. It will pass the self test. The basic unit must identify the Telescope Probe by indicating "I" on the display.



• Functional control of the GM-tube for low dose rate:
  
  Activate the single-pulse indication of the basic unit. Approx. 10 counts/min have to be heard. Due to the statistically varying dose rate of ambient background radiation the background counts are spread irregularly, too.
  
  NOTE: The functional control of the GM-tube for high dose rate can only be effected in high radiation fields, i. e. only by the manufacturer GRAETZ.



• Press the pushbutton at the side of the Telescope's handle for switching over to the inner GM-tube of the connected dose rate meter. During pressing the button the "I" on the display disappears. The pulse rate of the acoustic single-pulse indication may change.


• After the test, the dose rate meter can be removed from the Telescope Probe DE (open the locking device).

If a defect is observed during the control measurements, which cannot be cleared by yourself, the instrument has to be returned to the manufacturer GRAETZ for repair.

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