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GESTRA Steam Systems
NRGS 15-1
Installation Instructions 818479-00
Level Switch NRGS 15-1
Contents |
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Page |
Important notes |
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Usage for the intended purpose....................................................................................... |
8 |
Safety note....................................................................................................................... |
8 |
Danger ............................................................................................................................. |
8 |
Explanatory Notes |
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Scope of supply ............................................................................................................... |
9 |
Function ........................................................................................................................... |
9 |
Technical data................................................................................................................ |
10 |
Corrosion resistance ...................................................................................................... |
12 |
Establishing Functions |
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Select function ............................................................................................................... |
13 |
Factory setting ............................................................................................................... |
14 |
Cutting electrode tips to length ...................................................................................... |
14 |
Adjust function ............................................................................................................... |
15 |
Set sensitivity range....................................................................................................... |
15 |
Tools .............................................................................................................................. |
15 |
Installation |
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Level switch NRGS 15-1................................................................................................ |
16 |
Align terminal box .......................................................................................................... |
17 |
Remove terminal box ..................................................................................................... |
17 |
Mount terminal box ........................................................................................................ |
18 |
Tools .............................................................................................................................. |
18 |
Wiring |
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Connect level switch NRGS 15-1................................................................................... |
19 |
Tools .............................................................................................................................. |
19 |
Wiring diagram............................................................................................................... |
20 |
Commissioning |
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Check wiring .................................................................................................................. |
21 |
Apply mains voltage....................................................................................................... |
21 |
Check switching functions.............................................................................................. |
22 |
Malfunctions / Troubleshooting |
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Fault finding list .............................................................................................................. |
24 |
Replace electronic circuit board..................................................................................... |
25 |
2
Contents |
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Page |
Annex |
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Adjust other functions .................................................................................................... |
26 |
Installation in non-metallic vessel .................................................................................. |
27 |
Revised.......................................................................................................................... |
27 |
Examples of Installation ................................................................................................. |
28 |
3
Dimensions
180
130
~355
b = 60
A. F. 41
1" BSP to DIN ISO 228
1 2
1000
Fig. 1
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Functional Elements
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B |
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40 |
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A. F. 41 |
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E |
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D |
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>14 |
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50 |
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65-70 |
N10 |
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Ø 40 |
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1" BSP to DIN |
0.5 |
N8 |
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Fig. 3 |
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Functional Elements
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MAX 70°C |
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% |
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MAX 95% |
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IP 65 |
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F |
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G |
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Fig. 4 |
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H |
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15 |
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14 |
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O |
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12 |
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11 |
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9 |
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10 |
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9 |
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8 |
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I |
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7 |
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N |
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6 |
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3 2 |
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5 |
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M |
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1 |
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2 |
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1 |
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J |
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L |
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K |
J |
Fig. 5 |
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6 |
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Key
1LED 1 red
2LED 2 red
3LED 3 yellow
4 |
LED 4 red |
5 |
LED "Mains supply ON" green |
6Code switch S1
7Potentiometer for time delay (0 to 30 sec.)
8TEST button
9 RESET button
AGasket
BThermal insulation
CElectrode thread 1" BSP to DIN EN 228
DJoint ring Ø33x39 to DIN 7603 made from 1.4301
ESeating surface
FHousing lid
GHousing screws (cross recess head screws M4)
HTerminal strip for control cable connection
I Cable gland 3xM16x1.5
J Terminal strip for mains supply
KFixing screws for electronics insert
LPE connection
MFixing nut for terminal box
NTerminal lugs for electrode wires, functional earth
OTerminal strip for pushbuttons
7
Important notes
Usage for the intended purpose
The level switch NRGS 15 - 1 is designed for detecting and signalling levels in liquids with a minimum electrical conductivity.
The equipment must only be used within the admissible pressure and temperature ratings.
Any type of use differing from the usage described above must be considered as improper. The resulting risk will have to be borne by the user alone. The manufacturer hereby expressly rejects any claims for any damage resulting from improper usage.
Safety note
The equipment must only be installed and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified staff who - through adequate training - have achieved a recognised level of competence.
Danger
Danger
When loosening the level electrode steam or hot water might escape. This presents the danger of severe scalds to the whole body.
It is essential not to mount or dismantle the electrode unless the boiler pressure is verified to be zero!
The electrode becomes hot during operation. Touching the hot equipment presents the risk of severe burns to hands and arms. All installation, removal and maintenance work must only be performed when the system is cold.
Danger
The terminal strip of the level switch is live during operation. This presents the danger of electric shock!
Cut off power supply before opening the housing cover of the level switch! After removing the housing cover check again that the system is deenergized.
To check the power supply or the correct functioning, switch the level switch on again. This work must only be performed by qualified personnel.
8
Explanatory Notes
Scope of supply
NRGS 15-1
■1 Level electrode with four tips
■1 Terminal box with integrated level switch
■1 Joint ring Ø33x39 to DIN 7603, made of 1.4301 E8P
■1 Installation manual
or
NRGS 15-1
■1 Level electrode with four tips
■1 Terminal box with integrated level switch and built-in Test and Reset pushbutton
■1 Joint ring Ø33x39 to DIN 7603, made of 1.4301 E8P
■1 Installation manual
Function
The level switch NRGS 15-1 is a compact-type system consisting of a level electrode with four tips and an integrated level switch. For the correct functioning of the equipment the water must have a minimum conductivity of >0.5µS/cm at 25°C.
In the integrated level switch a time-delayed switching channel, an output relay and a signal LED are assigned to each one of the four electrode tips.
The functions of the switching channels 1 and 4 are fixed, the switchting channels 2 and 3 can be adjusted via code switch to suit individual requirements. The tips of the electrode are cut to length on site in order to establish the desired switchpoints of the associated switching channels.
The following functions are possible:
■Electrode rod 1 exposed / switching channel 1 energizes relay 1 = low level 1 with optional performance test and lock-out function
■Electrode rod 2 exposed / switching channel 2 energizes relay 2 = low level 2
■Electrode rod 3 exposed or submerged / switching channel 3 energizes relay 3 as a function of time = timed pump control (fill/discharge control)
■Electrode rod 3 exposed or submerged / switching channel 3 energizes relay 3 = on/off pump control (fill/discharge control)
■Electrode rod 4 submerged / switching channel 4 energizes relay 4 = high level
9
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