12/13 Elster-Instromet
GB/12.13/73018612d
Elster GmbH
Steinernstr. 19-21
D-55252 Mainz-Kastel
Germany
Tel. +49 (0) 61 34 605-0
Fax +49 (0) 61 34 605-390
www.elster-instromet.com
© Elster GmbH, December 2013 Subject to technical modification
Page 4 of 4
© Elster GmbH, December 2013 Subject to technical modification
Page 1 of 4
Elster GmbH
Steinernstr. 19-21
D-55252 Mainz-Kastel
Germany
Operating instructions
ID no. 73018612d
Absolute ENCODER S1, S1D
This product has been designed as:
1. a main index for gas meters; all other operating instructions shall continue to remain in force;
2. a top unit (transducer device) for gas meters equipped with a mechanical index drive (only
available as Encoder S1, S1D index).
The encoder is suitable for connection to a downstream add-on device (e.g. volume conversion
device, data logger or bus system) in explosive atmospheres (see table). For that purpose, a device
connected to the terminal box must have at least the following approval as associated apparatus:
[EEx ia IIC] for the model equipped with a Namur interface
[EEx ib IIC] for the model equipped with an SCR/SCR+ interface
(the M-Bus version is not ATEX approved)
and must meet the following limits:
I
k
max. 20 mA
U
o
max. 13.5 V
P
max
(I
k
* U
o
)
max. 270 mW
Encoder technical data
Encoder S1
Single index
Encoder S1D
Double index
Number of digit rollers
8
Temperature range
-20 °C to +60 °C
Protection class
IP 67
Interfaces
ATEX approval
NAMUR (II 2 G EEx ia IIC T4)
SCR/SCR+ (II 2 G EEx ib IIB T4)
M-Bus
Meter types
TRZ, Q, RVG, RABO, SMRI, IRM
RVG, RABO, IRM
LF pulse generator
optional or retrofittable: all IN-Sxx versions, IN-W11
U
i
= 24 V, I
i
= 50 mA, P
i
= 0.25 VA,
R
i
= 100 Ω (series resistor)
ENCODER add-on index – additional information
Torque
0.2 Nmm
Max. no. of revolutions of the
mechanical power take-off
1 Hz
Mechanical power take-off
pursuant to EN 12261
Power take-off value
0.1
1
10
Decimals
2
1
0
