
3 Types of totalizers
Manual TRZ 03· EN08 ·2018 September, 10th
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Danger
All pulse transmitters are intrinsically safe and must be con-
nected only to intrinsically safe circuits if they are used in ar-
eas subject to explosion hazards.
The safety barriers must meet the requirements of the
II (2) G Ex ia IIC
type of protection!
3.6.1
Connecting additional devices
The meter heads of the RMG TRZ 03 and TRZ 03K turbine meters are fitted with a
reed contact as standard. The pulse value corresponds to the rotation rate U
a
.
Notice
See the indicating plate on the meter head for exact frequency data.
The guide values are given in the tables in
chapter 6 Specifications
. The maximum
pulse frequency is 0.3 Hz. Optionally, a slot-type initiator can be installed.
In applications where a higher resolution is required, an additional HF 1 pulse
transmitter can be installed. Then the maximum pulse frequency will be of the or-
der of approx. 300 Hz at Qmax. The connector pin assignments for the standard
design with a reed contact (alternatively, with a slot-type initiator) are shown in the
illustration below. Please also note the indicating plate on the meter head.