Flowserve NRG 16-38S - Manual (Page 15)

15
Attention
■ Handle electrode with care. Do not bend electrode tip when mounting
and avoid subjecting the electrode to mechanical shocks.
■ Do not lag electrode body and transmitter housing above the mounting
flange.
■ Install level electrode only in a vertical position.
■ For the installation of the electrode a protection tube must be provided
on site, see installation specification page 22, 23.
Installation
NRG 16-38 S, NRG 16-39 S (Limiter NRG 16 -11) – step 1
1. Mark low water level on electrode tip and slide locking spring out of the small
hole of the measuring electrode . Also mark the low water level and the level
150 mm above low water level on the protection tube of the level transmitter.
Fig. 3 and 4
2. Unscrew electrode tip from measuring electrode and remove the locking
spring . Push electrode tip through spacer disc , remove retaining ring
and cut the electrode tip to length.
3. The electrode tip features a PTFE sleeve to provide sufficient creepage
distance and clearance. Strip off 150 mm of PTFE insulation (dimension ) from
the lower end of the electrode tip. Take new retaining ring from terminal box and
slide it along the lower end of the electrode tip . Make sure that 20 mm of the
upper end of the electrode tip (where the spring is located) remain uninsulated.
4. If a spacer disc is mounted near dimension you have to detach the spacer
disc from the protection tube of the level transmitter. Then slide the spacer disc
upwards and screw it into the nearest suitable M4 hole of the protection tube. In
order to prevent the electrode tip from swinging, the protection tube of the level
transmitter is provided with M4 holes every 100 mm starting at 350 mm so that the
spacer discs can be attached.
5. Push the electrode tip through the spacer discs , slide spring onto
electrode tip and screw back the electrode tip into the measuring electrode
and tighten. Use 13 mm open-end spanner to hold the measuring electrode .
Slide spring along electrode tip so that its end completely enters the small hole
.
6. If the electrode tips of the level electrode NRG 16-39 S are longer than the
protection tube of the level transmitter (dimension > ) slide the spacer discs
onto the tips at equal distances. Note that spacer discs must cover the PTFE area
and not the exposed metal rod.
D
D
F
F
C
B
NRG 16-38 S, NRG 16-39 S – step 2
1. Check seating surfaces and place joint ring onto mounting flange
(connecting standpipe).
2. Put combination electrode onto the mounting flange and tighten bolts in
diagonally opposite pairs.
D
A
A B
C
D
D
D
U
D
D
C U
A
F
F U
U
D
U
A
D
3 2
C