12 Technical Manual | Dräger Polytron
®
8000 Series
Safety-related information
2.4 Electrical installation
– Strict compliance must be given to the electrical codes that govern the routing
and connection of electrical power and signal cables to gas monitoring
equipment.
– Ferrules must be used.
– The conductors for the power supply must have an adequately low resistance to
ensure the correct supply voltage at the instrument.
– Wire insulation must be stripped by 5 to 7mm.
– Secondary circuit intended to be supplied from an isolating source (N/A for relay
circuits).
– When installed at locations exceeding ambient temperatures of 55 °C, use only
appropriate wiring, specified for at least 25 °C above the maximum ambient
temperature.
– The device variants incorporating a FISCO fieldbus interface as well as the Gas
Detection Transmitters type ETR 02…5** must be supplied by circuits that are
limited to overvoltage category I/II/III in accordance with IEC 60664 1.
Analog interface
– To ensure proper operation of the instrument, the impedance of the 4 to 20 mA
signal loop must not exceed 500 Ohms. Depending on the operating voltage and
according to the application (e. g. HART
®
operation), certain minimum
impedances must be observed 17.2 Signal transmission to control unit.
Relay option
– At voltages >30 V AC or >42.4 V DC, the relay cables must be enclosed in
protective tubing, or double-insulated cables must be used.
– The wiring for the optional relay module must be selected and fused according
to the rated voltages, currents and environmental conditions.
– To ensure that a fault is recognized - without having to look at the instrument - an
alarm device must be connected to the fault relay.
– Voltage differences can cause insulation faults. Do not mix electric loads with
different voltage types (AC or DC). Using DC loads, ensure that relay contacts
only control devices with the same DC voltage rating. Using AC loads, ensure
that relay contacts are only connected to devices sharing a common phase.
2.5 Commissioning
– Ensure wiring for relays and connections for sensor are made before applying
power.
– Before leaving the instrument for normal operation, check the configuration and
calibration for the proper settings.
For safe operation according to BVS 13 ATEX G 001 X and PFG 14 G 001 X the
instrument must remain in default alarm settings as listed below.
– The relays must be set to Normally energ. and the A2 alarm (main alarm) must
be set to Latching and Non-acknowledgeable or Pre-Acknowledgeable.
– The A1 alarm (pre alarm) may only be set to Acknowledgeable when it is used
for triggering an acoustic alarm device.
To Next Page
Loading...
Need help?
General
