Calibrating The Measuring Range (Span) - Samson Media 7 Mounting And Operating Instructions

8.2 Calibrating the measuring range (span)

NOTICE
!
Impermissible conditions during measurement will damage the differential pressure meter.
The test medium must free of oil and grease when the device is used to measure oxygen. Ad-
ditional conditions include:
− Gaseous oxygen (process medium)
− Temperature: max. +60 °C
− Oxygen pressure: max. 30 bar
When the device is used for oxygen service, make sure that the dp cell and any SAMSON
accessories only come into contact with gaseous oxygen.
Upon delivery, the device is calibrated with a linear characteristic based on the upper mea-
suring range value of the dp cell. After entering the tank and gas data, the device automati-
cally adopts the tank characteristic. Based on the gas data for the activated gas type, the de-
vice calculates the readings and output signal (4 to 20 mA) proportional to the tank content.
In the same way, the device calculates the max. possible differential pressure ∆p
for the gas type and the predefined reference height (total height or gauge pipe).
How to proceed:
Note
The user level must be set to 'Specialist' for the measuring range calibration (see sec-
tion 8.1.3).
Î Observe the sequence:
1. Calibrate zero.
2. Calibrate the measuring range
(span).
Î At Δp , the output signal must be 20 mA.
100
Î To check the measuring range, connect the differential pressure meter as shown in
Fig. 18.
EB 9510 EN
Operation of Media 7 Differential Pressure Meter
in mbar
100
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