Elgas DATCOM, Operating Instructions Manual

Page: 152 / 228

9
Connecting Inputs
150
Input Module Terminals Mounting options
4-20 mA analogue S1-2AI AI1 SLOT 1
SLOT 2
AI2
Table 26 Options of analogue inputs for the ELCORplus Indexer device
9.1 LF Pulse Inputs
There are used to count pulses from the gas meter. For these inputs, flow measurement function
can be selected. The backup battery ensures that the counter readings and the LF input pulses
count are maintained even when the battery is discharged or replaced. After the power supply
connecting, the impulses read during the voltage outage of the supply battery are added to the
spare counters.
Changing the Measurement Units, Setting the Gas Meter Constant
Pulse input measurement units can be changed by the utility SW [42], [43]. The gas meter
conversion constant and the gas meter serial number can be set using both the utility SW and the
device keypad. When setting the gas meter constant value, only decimal multiples or fractions
within the range of 0.001 to 1000 should be used.
9.2 Binary Inputs
These inputs are used to scan the input signals with the possibility to detect the state "closed" (i.e.
log 0) or "open" (log 1). The device allows to evaluate binary inputs from potential-free outputs
(reed contact or open collector).
By setting the parameters, the user can select the displayed actual values, save changes to these
entries in the archive, the displayed message for log. 0 and log. 1 statuses and the active signal
level.
9.3 HF Pulse Inputs (NAMUR)
These inputs are available on ELCOR plus with S0-EXT1 module. For these inputs, flow
measurement function can be selected. The backup battery ensures that the counter readings are
maintained when the external power supply fails even when the main battery is discharged or
replaced, but it does not provide for pulse counting in this case.
Changing the Measurement Units, Setting the Gas Meter Constant
Pulse input and gas meter measurement units can be changed by the utility SW. The gas meter
constant and gas meter serial number can also be set from the device keypad.
9.4 Connecting a Gas Meter with an Encoder
A gas meter equipped with an encoder can be connected to the corrector. The meter counter
reading is transferred to the corrector in digital form. To connect an encoder, it is necessary to
install the module into SLOT 0 according to the type of encoder. Two types of encoders, a
NAMUR encoder and an SCR encoder, are supported.
The use of both types of encoders is metrologically approved by EC Type Certificate TCM
143/18-5562.