Flowserve ER 50-1 User Manual
GESTRA Steam Systems
ER 50-1
ER 56-1
Installation Instructions 818781-00
Level electrode
ER 50-1, ER 56-1
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Contents
Page
Important Notes
Usage for the intended purpose ..............................................................................................................4
Safety note .............................................................................................................................................4
Danger ...................................................................................................................................................4
Attention .................................................................................................................................................4
ATEX (Atmosphère Explosible) ................................................................................................................4
Explanatory Notes
Scope of supply ...................................................................................................................................... 5
Description .............................................................................................................................................5
Function .................................................................................................................................................5
Design .................................................................................................................................................... 5
Technical Data
ER 50-1, ER 56-1 ....................................................................................................................................
Corrosion resistance ............................................................................................................................... 6
Sizing .....................................................................................................................................................6
Name plate / marking .............................................................................................................................7
Dimensions ............................................................................................................................................8
Design
ER 50-1, ER 56-1 ....................................................................................................................................9
Key .......................................................................................................................................................11
Functional Elements
ER 50-1, ER 56-1 ..................................................................................................................................10
Key .......................................................................................................................................................11
Installation
ER 50-1, ER 56-1 ..................................................................................................................................12
Table “Functions” .................................................................................................................................12
Attention ...............................................................................................................................................12
Note .....................................................................................................................................................12
Tools ....................................................................................................................................................12
Examples of installation ........................................................................................................................13
Key .......................................................................................................................................................14
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Contents – continued –
Page
Electrical Connection
ER 50-1, ER 56-1 ..................................................................................................................................15
Wiring diagram ..................................................................................................................................... 15
Tools ....................................................................................................................................................15
Commissioning
Checking electrical connection .............................................................................................................16
Checking the assignment of the switching functions ............................................................................16
Operation
ER 50-1, ER 56-1 ..................................................................................................................................16
Water level limiter ................................................................................................................................ 16
Troubleshooting
Fault finding list .................................................................................................................................... 17
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Important Notes
Usage for the intended purpose
The level electrodes ER 50-1 and ER 56-1 are designed for signalling liquid levels.
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
When loosening the electrode steam or hot water might escape.
This presents the danger of severe scalds to the whole body.
Before removing the electrode make sure that the boiler pressure is zero bar.
The electrode becomes hot during operation. Touching the hot equipment presents the
risk of severe burns to hands and arms. All installation and maintenance work must only
be performed when the equipment is cold.
Attention
The name plate specifies the technical features of the equipment. Note that any piece of
equipment without its specific name plate must neither be commissioned nor operated.
ATEX (Atmosphère Explosible)
According to the European Directive 94/9/EC the equipment must not be used in potentially explosive
atmospheres.
Explanatory Notes
Scope of supply
ER 50-1
1 Level electrode ER 50-1
1 Joint ring D 33 x 39 DIN 7603-1.4301
1 Installation manual
ER 56-1
1 Level electrode ER 56-1
1 Joint ring D 33 x 39 DIN 7603-1.4301
1 Installation manual
Description
The level electrodes ER 50-1 and ER 56-1 work according to the conductivity measurement principle.
The ER 50-1/56-1 can signal a maximum of three levels in electrically conductive liquids:
■ Low level alarm (MIN alarm), pump ON, pump OFF with one NO contact
ER 50-1 for vessels up to PN 6, e. g. for condensate and low-pressure systems as well as (pressurised)
hot-water installations, concrete vessels, feedwater tanks. PN 6 flanges only available on request.
ER 56-1 for vessels up to PN 40, e. g. in high-pressure steam plants.
For the operation of the level electrodes ER 50-1 and ER 56-1 an external GESTA level switch is
required, e. g. NRS 1-1 for fill and discharge control with first low-level alarm, NRS 1-5 for fill and
discharge control with high-level alarm, NRS 1-2 as first low-level alarm and high-level alarm or NRS
1-3 as water level limiter with test button.
Function
The conductivity of the liquid is used to signal the liquid level. Some liquids are conductive, which
means that they allow an electric current to flow through them. For the safe functioning of this device
a minimum conductivity of the liquid to be monitored is required.
The conductivity measurement method can detect two conditions: electrode rod submerged or
exposed, meaning switchpoint reached (or exceeded) or not yet reached. Before installation, the
length of the electrode rod must be cut to the required switching levels, e. g. for limit alarm or the
switching of a valve or pump.
Design
ER 50-1: Screwed 1" to EN ISO 228-1, PN 6
ER 56-1: Screwed 1" to EN ISO 228-1, PN 40
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Technical Data
ER 50-1, ER 56-1
Type approval
TÜV · WR/WB · 03-302
Service pressure
ER 50-1: 6 bar g at 159°C
ER 56-1: 32 bar g at 238°C
Connection
Screwed 1" to EN ISO 228-1
Materials
Stem: 1.4571 CrNiMoTi17-12-2
Body: 1.4571
Flange: 1.0460 C22.8
Measuring electrodes:
Electrode insulation:
Spacer disks: PTFE
Lengths supplied
1000 mm, 1500 mm
Response sensitivity
10 μS/cm at 25 °C, cell constant 0.3 cm
0.5 μS/cm, depending on level switch NRS 1-...
Electrical connection
Four-pole connector, cable gland M 16
Protection
IP 65 to EN 60529
Max. admissible ambient temperature
70 °C
Weight
Approx. 0.8 kg
1.4571 CrNiMoTi17-12-2
PTFE
–1
Corrosion resistance
Provided that the equipment is used for its intended purpose, its safety is not impaired by corrosion.
Sizing
The body must not be subjected to sharp increases in pressure. Welds and flanges of the electrode are
designed to withstand dynamic loading (bending and alternating stress). The dimensional allowances
for corrosion reflect the latest state of technology.
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