Assembly, Connection and Putting into Operation 37
5.2.1.2 Connection to an encoder
1. Connect the encoder of the gas meter to the "DE1" terminal ( 1 in Fig.
10, page 36) of the EK280.
The polarity should be taken into consideration, i.e. connect the "+" of
the encoder to the "DE1 +" terminal and "-" to the "DE1 -" terminal re-
spectively.
2. Adjust the measurement parameters, e.g. the encoder type, as de-
scribed in chapter 5.3.1.3.
5.2.1.3 Connection to a high frequency pulse transducer
The EK280 can only count the pulses of a high frequency
pulse transducer if there is an external power supply - not
when in battery mode.
In order to ensure an uninterrupted measurement of the gas volume, the
EK280 can be configured in such a way that the device automatically
switches to a low frequency pulse transducer in the event of a failure of the
external power supply; see chapter 5.2.1.4.
If you would like to use the automatic switching function of the
pulse transducer, please proceed as per chapter 5.2.1.4!
1. Connect the high frequency pulse output of the gas meter to the "DE1"
terminal ( 1 in Fig. 10, page 36) of the EK280.
The polarity should be taken into consideration, i.e. connect the "+" of
the pulse transducer with the "DE1 +" terminal and "-" with the "DE1 -"
terminal respectively.
2. Adjust the measurement parameters, e.g. the cp value (pulse constant),
as described in chapter 5.3.1.2.
5.2.1.4 Automatic switchover of the pulse transducer
The EK280 should be configured as described in order to ensure an unin-
terrupted 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 automati-
cally switch to the low frequency pulse transducer.
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