11
WIKA operating instructions, pressure transmitter, model MH-1
EN
2009211.08 10/2017 EN/DE/FR/ES
5.2 Connecting the instrument to the electric system
Requirements for voltage supply
For power supply see product label.
This equipment is intended for operation with low voltages, which are separated from
the power supply or voltages of greater than AC 50 V or DC 120 V.
Preferably, a connection to an SELV circuit is recommended, or alternatively to circuits
with a different protective measure in accordance with IEC 60364-4-41.
Option for North America: The connection can be made in line with “class 2 circuits”
or “class 2 power units” in accordance with CEC (Canadian Electrical Code) or NEC
(National Electrical Code).
Requirements for electrical connection
■
Cable diameter matches the cable bushing of the mating connector.
■
Cable gland and seals of the mating connector are correctly seated.
■
With cable outlets, no humidity can ingress at the cable end.
Requirement for shielding and grounding
The pressure transmitter must be shielded and grounded in accordance with the
grounding concept of the plant.
Lines within a building which are longer than 30 m or leave the building (including lines
of outdoor installations) shall be shielded cables. The shield shall be connected to
ground at least on one side of the cable.
In individual cases equipment exposed to strong electromagnetic fields with frequen-
cies from 300 MHz to 700 MHz and 1 GHz to 2 GHz may show increased measuring
errors of up to 3.2 %. To avoid such influences on the measuring signal do not operate
the equipment in proximity to strong transmitting devices or radio installations, or use
suitable sheath current filters.
Connecting the instrument
1. Assemble the mating connector or cable outlet.
→ For pin assignment see product label
2
.
Establish the plug connection.
5. Commissioning, operation
