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10 Electrical connection
10.1 Connection and safety information
Devices with cable glands and cable sockets
1. Ensure that the outside diameter of the cable used is
within the permissible clamping range (cable gland M12 x
1.5 cable dia. 3–6.5 mm, cable socket ISO 4400 cable dia.
4.5–10 mm). In addition, make sure that the cable is
seated securely in the cable gland, without any gaps.
2. Use a shielded, twisted multicore cable for the electrical
connection.
Devices with a cable outlet
Comply with the following minimum bend radii when laying
the cable:
–
Cable without air hose:
Fixed in place: 5 x cable diameter
Flexible use: 10 x cable diameter
–
Cable with air hose:
Fixed in place: 10 x cable diameter
Flexible use: 20 x cable diameter
On devices with a cable outlet and integrated vent tube, the
PTFE filter on the cable end on the gauge tube must not be
damaged or removed.
▶ Cables used for gauge devices have a vent tube for
equalizing the pressure. Route the cable end into an area
or suitable terminal box that is as free from moisture and
corrosive gases as possible in order to prevent damage.
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NOTICE
10.2 Conditions for hazardous locations
Hazard due to electro-static build-up
Danger of explosion!
▶ Risk of death or severe injury.
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The following warning sign is affixed to devices with plastic
parts.
Attention!
Plastic parts.
There is a
risk of
electro-static
build-up.
Fig. 1: Warning sign
▶ The warning sign must not be removed from the device.
Overvoltage protection
If the pressure transducer is used as a category 1 G device, a
suitable overvoltage arrester must be installed upstream (see
BetrSichV [German Health and Safety in the Workplace Regu-
lation] and EN 60079-14).
Circuit diagram
When choosing the requisite Zener barrier or power discon-
nectors for operating an intrinsically safe device in a poten-
tially explosive environment, particular care must be taken to
ensure that this/these will not impair the device's functional-
ity in any way. The diagram below illustrates a typical layout
comprising a power supply unit, Zener barrier and screw-in
probe or measuring transducer.
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10 Electrical connection
DANGER
Danger of explosion due to sparking
as a result of electro-static build-up in
plastic parts.
On devices with a cable outlet, the
connection cable must be fixed in
place.
Do not use a dry cleaning method to
clean the device and, if applicable, the
connection cable; use a damp cloth,
for example.
Danger of explosion if operating
voltage is too high (max. 28 V
the field housing is opened during op-
eration.
Only install the device when it is de-
pressurized and de-energized.
Do not install the device if there is a
danger of explosion.
Always operate the device within its
specifications. (Technical data)
The field housing must not be opened
if there is a danger of explosion.
NOTICE
GEMÜ 3140 ... X
) and if
DC
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