GASSONIC OBSERVER-i
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5.2.
Gassonic 1701 Portable Test and Calibration Unit
The Gassonic 1701 Portable Test and Calibration Unit (Gassonic 1701) provides a
traceable
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gain test
and calibration of all Gassonic ultrasonic gas leak detectors. The Gassonic ultrasonic gas leak
detectors are calibrated at the factory, but if plant regulations require documentation, the Gassonic
1701 can be used. Calibration of the Gassonic Observer-i is only needed when the unit is more than ±3
dB out of tolerance. This can be verified by doing a Gain Test on the unit. The Gassonic Observer-i
Gain Test is one of the test sequences of the Gassonic 1701. Calibration is performed with a calibrated
Gassonic 1701.
5.3. Gain
Test
Select type “Observer” on the Gassonic 1701 and then select Gain Test (see the Gassonic 1701 User
Manual for details). Attach the Gassonic 1701 onto the Gassonic Observer-i and activate the Gain Test
by pressing the ENTER or TEST button. The Gassonic 1701 will output a constant SPL of 99 dB for 8
seconds and then to 0 dB for 3 seconds. Thereafter, the SPL will return to 99 dB and the sequence will
be repeated until a new SPL is selected or the test stopped. To select a new SPL, the DOWN button
should be pressed. There are four levels; 99 dB, 89 dB, 79 dB and 64 dB. The dB readout on the
display of the Gassonic 1701 can now be compared with that of the Gassonic Observer-i.
5.4. Calibration
Select type “Observer” on the Gassonic 1701 and then select Calibration (see the Gassonic 1701 User
Manual for details). Attach the Gassonic 1701 onto the Gassonic Observer-i. Set the Gassonic
Observer-i into Calibration mode by holding the magnet stick on the ENTER switch for more than 3
seconds. The Gassonic Observer-i will display a flashing “CAL”. Verify the need for calibration by
activating the ENTER switch one more time. The Gassonic Observer-i will now display a flashing
“1701”. This indicates that the Gassonic Observer-i is ready for calibration and is awaiting
communication from the Gassonic 1701 unit.
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The Gassonic 1701 Test and Calibration unit is calibrated itself, according to
an international traceable reference, and comes with a
calibration certificate.
