3 Types of totalizers
Manual TRZ 03· EN08 ·2018 September, 10th
45
The guide values are listed in the tables on pages 37 through 39. The maximum
pulse frequency is approx. 2100 Hz at Q
max
but depends on the meter size.
HF 2, HF 3
1
Proximity switch
2
Connector
HF 2: reference wheel
f
max
= 2,1 kHz (NAMUR)
HF3: turbine wheel
Figure 11: Connector pin assignments for the HF 2/3 pulse transmitter
Connections are made by means of multi-pin connectors.
Normally, an LF pulse transmitter is connected to contacts 1 and 4, while a single
HF 1 pulse transmitter is connected to contacts 3 and 6. Here the highest number
is always (+).
High-frequency pulse transmitters which go with the turbine wheel (HF 2) or the
reference wheel (HF 3) are usually connected to contacts 1 and 3 (for older
devices 1 and 6).