Installing Transmitter
Page 10 of 42
9023810 - 2nd edition - September 2005
Internal wiring in the transmitter’s enclosure
Connect the individual conductors (conductor length min. 55 mm, 5 mm insulation
stripped) to the spring terminal clamp so that it is short. Use ferrules in case of stran-
ded cables.
Use of spring terminal clamps in the transmitter
1
Insert screw driver (width 3 mm) or attached special tool (see also order list,
page 27) into the spring terminal clamp.
2
Press spring downwards to open the clamp in the lower part.
Insert stripped cable end or ferrule (if necessary) into the lower part.
3
Remove screw driver or special tool from the upper part. The electrical connec-
tion is ensured by the constant pressure force of the spring.
— For the wiring of power supply and signal loop cables only cables with a cross-
section of at least 0.75 mm
2
may be used. Cables with a cross-section of
0.5 mm
2
may only be used if the are equipped with an isolating ferrule (e.g.
Zoller+Fröhlich, Type V3AE0005, V3AE0037 or equivalent). This ensures an IP-
rating of IP 30 if the transmitter housing is opened for maintenance purposes.
Only Type XTR 0090 and XTR 0091:
— For the wiring between transmitter and sensing head (e.g. Sensing Head SE Ex
PR M) use only cables with a cross-section of at least 0.75 mm
2
. Cables with a
cross-section of 0.5 mm
2
may only be used if the are equipped with an isolating
ferrule (e.g. Zoller+Fröhlich, Type V3AE0005, V3AE0037 or equivalent). This
ensures an IP-rating of IP 30 if the transmitter housing is opened for mainte-
nance purposes.
Remark:
Blank cables must not stick out the spring terminals. The method of explo-
sion protection during maintenance is based on the condition that it is not
possible to contact blank cable parts by a probe of 2.5 mm diameter
(definition of IP 30).
Attention:
The spring terminal clamps are an integral part of the 4 to 20 mA-con-
verter. Improper handling might damage the terminal clamps so that the
complete converter would have to be replaced.
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