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5.2.1.4
Automatic switchover of the pulse transducer
The EK280 should be configured as described in order to ensure an
uninterrupted measurement of the gas volume when using a high
frequency pulse transducer.
If the power supply is in a functioning order, the volumes and flows (Vb,
Vm, Qb, Qm) will be measured with the high frequency pulse transducer. In
the event of a failure of the external power supply, the EK280 will
automatically switch to the low frequency pulse transducer.
1
Fig. 11
5.2.2 Sealing the input terminals
After connecting to the gas meter as per chapter 5.2.1, the input terminal
"DE1" must be sealed for official calibration measurements.
For this purpose, terminal covers are provided in the bag of accessories. If
required, these should be screwed over the connected terminals and an
adhesive seal should then be bonded to the fastening screw (see chapter
5.3.2).
5.2.3 Connecting the temperature sensor
Any national requirements must be observed when
connecting the temperature sensor.
The requirements of the PTB Testing Instructions, Volume
20, Electronic volume conversion device for gas, Chapter 5,
shall apply to Germany.
Before connecting, the temperature sensor should be
lubricated with heat transfer fluid in order to enhance its
functionality.
Assembly, Connection and Putting into Operation
1. Connect the low frequency pulse
transducer of the gas meter to the
"DE1" terminal (1 ) of the EK280.
2. Connect the high frequency pulse
transducer of the gas meter to the
"DE2" terminal (2 ) of the EK280.
3. Adjust the measurement
parameters, e.g. the cp value
(pulse constant), as described in
2
chapter 5.3.1.5.
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