Internal Wiring In The Transmitter's Enclosure; Use Of Spring Terminal Clamps In The Transmitter - Dräger PEX 3000 Instrucciones Para El Servicio

Installing Transmitter

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.
— For the wiring of power supply and signal loop cables only cables with a cross-
section of at least 0.75 mm
2
0.5 mm 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
cross-section of 0.5 mm
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).

Use of spring terminal clamps in the transmitter

1 2
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.
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.
Page 10 of 42
2
may be used. Cables with a cross-section of
2
may only be used if the are equipped with an isolating
3
2
. Cables with a
1 2
9023810 - 2nd edition - September 2005
OK
M
3