Endress+Hauser NRF590 Kurzanleitung Seite 3

Exchange of the power supply on the Tank Side Monitor NRF590
Only identical, original E+H spare parts may be used.
2 1
0
The instrument may only be maintained and repaired by qualified personnel. The device documentation, applicable standards and legal
requirements as well as any certificates have to be observed!
power supply, version 1
main fuse
module retainer
Ex i-devices:
0 2 1
Ex d-devices:
Before disassembly ensure that the supply voltage for the instrument has been switched off
The exchange requires the following tools
• Philips screw driver size 1 and 2
• Hexagonal key AF 3 mm
• Flat pliers / screwdriver
• Eventually a pair of tweezers
Disassembly the power supply
1. Loosen the safety pin for the display lid (AF 3 mm) approx. 4 turns.
2. Unscrew the display lid (7 turns).
housing. Then, attempt once again to unscrew display lid.
3. Grip the sides of the display and push in on each side to snap the display out.
4. Push on the cable´s retainer clips and unplug the cable.
5. Unscrew the 2 screws of the electronics compartment cover and remove cover.
6. Remove power supply by a flat pliers or lever out on both sides with a screwdriver (version 2).
The assembly is done in reverse order. Note the right position of cover (5) for the electronics compartment (see figure).
Adjustment or calibration is not necessary.
At last adjust the safety pin (1) so it is set over the lid and tighten the safety pin.
KA586F/00/a2/09.07
52016529
Ausgabe/revision: 4
When changing version 1 against version 2,
due to ATEX it is necessary to fix a new
type plate with a key ring on the eye of
the housing.
The repair has to be performed such, that the voltage isolation of the Ex ia circuits against ground is maintained.
If required, a test can be performed with 500 Veff over a time period of 60 s.
Attention has to be paid not to damage the threads.
Before assembly, the threads of the lids and the sensor module must be lubricated with acid-free grease. It is not
necessary if the threads are coated with a non-greasy dry-lubricating material.
Power supply
2
3 5
Old design of the
display holder (new
see next page)
Note: If the display lid is difficult to unscrew, unplug one of the cables from the cable gland to allow air to enter the
Note:
6
4
Safety pin
hexagonal key
AF 3 mm
Don´t pull on the flat cable!
power supply, version 2
notch for a tool
1
Ex-transformer
with thermal fuse
Loop