Dräger Polytron 8200, Инструкция по эксплуатации

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8 Dräger Polytron 8200/8310
Installation
3.2 Restrictions on the installation
z
The device requires a DC voltage between 10 and 30 V.
The minimum supply voltage of 10 V and the cross-section
of the conductors used determine the distance of the
device from the supply or the central controller
(see chapter 12 on page 28). The device is designed for
cables of sizes 12 to 24 AWG (0.2 to 2.5 mm
2
). Use
a three-wire, shielded cable as a minimum.
z
The device must not be subjected to any radiant heat
(e.g. direct sunlight) as this will result in a temperature rise
above the specified thresholds (see chapter 12 on
page 28). The use of a reflective screen is recommended.
z
The housing is weather resistant and suitable for outdoor
applications. The use of the optional splash guard is
recommended to protect the sensor from water and dust.
z
The device must be installed and operated in an
environment which conforms to the stated specifications
(see chapter 12 on page 28).
z
To insure proper operation of the device, 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 adhered to (see chapter 3.3 on
page 8). The conductors for the power supply must have
an adequately low resistance to insure the correct supply
voltage at the device.
3.3 Impedance range of the signal loop
Devices with a HART interface can be operated with HART
communication or in HART Multidrop mode.
3.4 Mechanical installation
z
Use the supplied drilling template for mounting on a wall.
z
The mounting surface should be even and free of sharp
edges.
z
Dräger recommends using M6 Allen bolts.
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The openings must be readily accessible to the surrounding
atmosphere.
NOTICE
A dust cap can be fitted to the cable entry of the device.
This cap is only used for transport purposes and must
be removed before the device is connected to a sealed
conduit.
i i
Operating mode Impedance range of the
signal loop
Supply
voltage range
Operation
without HART
communication
0 to 230 Ω at 10 V DC
Rising linearly with the
supply voltage from:
0 to 230 Ω at 10 V to
0 to 500 Ω at 16 V
10 to 18 V DC
0 to 500 Ω 18 to 30 V DC
Operation with
HART
communication
(HART mode)
230 to 270 Ω at 13 V DC
Rising linearly with the
supply voltage from:
230 to 270 Ω at 11 V to
230 to 500 Ω at 16 V
11 to 16 V DC
230 to 500 Ω 18 to 30 V DC
HART Multidrop
operation 230 to 500 Ω 10 to 30 V DC