Bühler technologies NS 1-G1-AM Betriebsanleitung
Fluidcontrol
Installation and Operation Instructions
Original instructions
External level switches
NS 1-G1/2-AM
BE200006
01/2022
Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. +49 (0) 21 02 / 49 89-0, Fax: +49 (0) 21 02 / 49 89-20
E-Mail: [email protected]
Internet: www.buehler-technologies.com
Bühler Technologies GmbH, Harkortstr. 29, D-40880 Ratingen
Tel. +49 (0) 21 02 / 49 89-0, Fax: +49 (0) 21 02 / 49 89-20
Internet: www.buehler-technologies.com
E-Mail: [email protected]
Read this instruction carefully prior to installation and/or use. Pay at-
tention particularly to all advises and safety instructions to prevent in-
juries. Bühler Technologies can not be held responsible for misusing
the product or unreliable function due to unauthorised modifications.
All rights reserved. Bühler Technologies GmbH 2022
Document information
Document No.........................................................BE200006
Version......................................................................... 01/2022
NS 1-G1/2-AM
Contents
1 Introduction..................................................................................................................................................................................................................... 2
1.1 Intended Use.........................................................................................................................................................................................................2
1.2 Functionality......................................................................................................................................................................................................... 2
1.3 Model key............................................................................................................................................................................................................... 2
1.4 Scope of Delivery.................................................................................................................................................................................................. 2
2 Safety instructions......................................................................................................................................................................................................... 3
2.1 Important advice................................................................................................................................................................................................. 3
2.2 General hazard warnings .................................................................................................................................................................................4
3 Transport and storage .................................................................................................................................................................................................. 5
4 Installation and connection ........................................................................................................................................................................................6
4.1 Mechanical installation.....................................................................................................................................................................................6
4.2 Electrical connections ........................................................................................................................................................................................ 7
4.3 Adjusting the level contacts............................................................................................................................................................................. 7
4.4 Information on the correct operation of reed contacts in Bühler level switches.............................................................................9
5 Operation and control ................................................................................................................................................................................................ 10
6 Cleaning and Maintenance........................................................................................................................................................................................ 11
7 Service and repair..........................................................................................................................................................................................................12
8 Disposal............................................................................................................................................................................................................................13
9 Appendices..................................................................................................................................................................................................................... 14
9.1 Technical Data.................................................................................................................................................................................................... 14
9.2 Standard pin assignment ................................................................................................................................................................................15
10 Attached documents................................................................................................................................................................................................... 16
iBühler Technologies GmbHBE200006 ◦ 01/2022
NS 1-G1/2-AM
1 Introduction
1.1 Intended Use
The NS1 level switch series serves liquid level monitoring in tanks in fluid systems. They are installed on the tank and have a
visual display. Up to four switching contacts provide an electronic signal for fill level monitoring.
A medium temperature between -20 °C and 80 °C (-4 °F and 176 °C) must be maintained. The level switch must not be used in
highly flammable or corrosive liquids. The medium must not contain particles, particularly metallic particles, to prevent depos-
its on the float or between the float and switching tube. If necessary, filter the medium.
Please refer to the technical data for the specific intended use and available material combinations.
Please refer to the type plate for your equipment configuration. In addition to the job number, this also contains the item num-
ber and type designation.
WARNING
All device models are solely intended for industrial applications. They are not safety com-
ponents. The devices must not be used if failure or malfunction thereof jeopardises the
safety and health of persons.
Use in explosive areas is prohibited.
Any use outside the technical data and outside the areas of application specified in these instructions is considered improper
use.
1.2 Functionality
The measuring tube is located inside the bypass tank with sight glass. The level switches are located inside the measuring tube.
These are activated by a magnet inside the level switch float.
The level contacts are reed switches. They are mounted to a perforated rail spaced as specified in the purchase order, but can be
moved.
1.3 Model key
NS 1-G1/2-AM-xx-nn-xx-xx
M3
M12
C7
NO/NC
Changeover (max. 2)
K
W
280
370
500
nnn
Type designation
Plug connection
Length
1- 4 contacts
Level measurement
Level contacts
Connection
G1/2
Tank top installation
(variable, please specify value)
Ordering example:
You require: Level switch for external installation, G1/2 connections, length L= 370 mm, M3 plug connection
2 level contacts, 1st contact 100 mm NC, 2nd contact 300 mm NO
Order NS 1-G1/2-AM-M3/370-2K L1=100 NC, L2 = 300 NO
1.4 Scope of Delivery
– Level switch
– Product documentation
– Connection/mounting accessories (optional)
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2 Safety instructions
2.1 Important advice
Operation of the device is only permitted if:
– the product is used under the conditions described in the installation- and operation instruction, the intended application
according to the type plate and the intended use. In case of unauthorized modifications done by the user Bühler Technolo-
gies GmbH can not be held responsible for any damage,
– when complying with the specifications and markings on the nameplates.
– the performance limits given in the datasheets and in the installation- and operation instruction are obeyed,
– monitoring devices and safety devices are installed properly,
– service and repair is carried out by Bühler Technologies GmbH,
– only original spare parts are used.
This manual is part of the equipment. The manufacturer keeps the right to modify specifications without advanced notice. Keep
this manual for later use.
Signal words for warnings
DANGER
Signal word for an imminent danger with high risk, resulting in severe injuries or death if not avoided.
WARNING
Signal word for a hazardous situation with medium risk, possibly resulting in severe injuries or death if not
avoided.
CAUTION
Signal word for a hazardous situation with low risk, resulting in damaged to the device or the property or
minor or medium injuries if not avoided.
NOTICE
Signal word for important information to the product.
Warning signs
These instructions use the following warning signs:
Warns of a general hazard General notice
Warns of voltage Unplug from mains
Warns not to inhale toxic gasses Wear respiratory equipment
Warns of corrosive liquids Wear a safety mask
Warns of explosive areas Wear gloves
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2.2 General hazard warnings
The equipment must be installed by a professional familiar with the safety requirements and risks.
Be sure to observe the safety regulations and generally applicable rules of technology relevant for the installation site. Prevent
malfunctions and avoid personal injuries and property damage.
The operator of the system must ensure:
– Safety notices and operating instructions are available and observed,
– The respective national accident prevention regulations are observed,
– The permissible data and operational conditions are maintained,
– Safety guards are used and mandatory maintenance is performed,
– Legal regulations are observed during disposal,
– compliance with national installation regulations.
Maintenance, Repair
Please note during maintenance and repairs:
– Repairs to the unit must be performed by Bühler authorised personnel.
– Only perform conversion-, maintenance or installation work described in these operating and installation instructions.
– Always use genuine spare parts.
– Do not install damaged or defective spare part. If necessary, visually inspect prior to installation to determine any obvious
damage to the spare parts.
Always observe the applicable safety and operating regulations in the respective country of use when performing any type of
maintenance.
The method for cleaning the devices must be adapted to the IP protection class of the devices. Do not use cleaners which could
damage the device materials.
DANGER Toxic, corrosive gases or liquids
Gasses or liquids can be harmful to the health.
a) If necessary, ensure a safe gas/liquid discharge.
b) Always disconnect the gas supply when performing maintenance or repairs.
c) Protect yourself from toxic/corrosive gasses/liquids when performing maintenance.
Wear suitable protective equipment.
DANGER Potentially explosive atmosphere
Explosion hazard if used in hazardous areas.
The device is not suitable for operation in hazardous areas with potentially explosive at-
mospheres.
Do not expose the device to combustible or explosive gas mixtures.
4 Bühler Technologies GmbH BE200006 ◦ 01/2022
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3 Transport and storage
Only transport the product inside the original packaging or a suitable alternative.
The equipment must be protected from moisture and heat when not in use. It must be stored in a covered, dry, dust-free room
at room temperature.
5Bühler Technologies GmbHBE200006 ◦ 01/2022
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4 Installation and connection
4.1 Mechanical installation
CAUTION Oil leak
Damaged sight glass
Ensure the bypass tank, particularly the sight glass, is not damaged by external forces.
NOTICE
The level switch must be mounted vertically to the tank to allow the float to move freely.
The mounting surface on the tank must have a minimum surface quality of Rmax = 6.3. If
the surface quality is inadequate, leaks may occur.
The level switches come fully assembled and can be mounted to the tank with G1/2 hollow screws.
Proceed as follows:
– Install the bypass tank (1) in the planned position:
Ensure the O-rings (4) are correctly seated in the grooves on the bypass tank.
– Insert the two G1/2 hollow screws (2) all the way through the respective G3/4 opening and firmly secure to the tank.
– The screw the two VSTI plugs (3) firmly into the G3/4 threads on the tank.
1 Bypass tank 2 G1/2 hollow screws
3 VSTI plugs 4 O-rings
5 Mounting surface (note surface quality) 6 Hexagon nut SW36
7 Spanner size SW12 8 Magnet
9 Float
6 Bühler Technologies GmbH BE200006 ◦ 01/2022
NS 1-G1/2-AM
CAUTION Oil leak
Removing the level switch
When removing the level switch, ensure there is no fluid left in the tank or could leak
from the tank.
Note: After removing the float, be sure the magnet inside the float is above the fluid level. This can easily be verified with a piece
of iron to determine the magnet position inside the float.
4.2 Electrical connections
For devices with 230 V mains voltage:
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
The connection voltage is 24VDC or 230VAC (rated values). It connects with plugs. Please refer to the drawing in the appendix
for the pin assignment.
Depending on the order specifications, the level contacts are "falling NO contact (NC)", "falling NC contact (NO)" (contact type K8)
or changeover contacts (contact type W9) and mounted in the specified position. The position can be changed later (see chapter
Adjusting the level contacts [> page7]). The contact logic assumes the level switch is installed with the tank empty, meaning
it is only in the operating position once the tank has been filled.
4.3 Adjusting the level contacts
The contacts for level measurement are locked into a bent rail inside the protective tube. They are positioned as specified in the
purchase order, but can be moved to any position if necessary.
For devices with 230 V mains voltage:
DANGER Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
– Disconnect the voltage supply.
– Disconnect the plug.
– Unscrew the plug base. For plug-in connectors with screw-in plug base, unscrew the top hexagon ring and pull the complete
pin insert up until the bottom of the base can be unscrewed freely.
– Carefully pull the bent rail with contacts out the top.
NOTICE
The earth wire is a loop and soldered to the protective tube from the inside in the inser-
tion direction. To prevent breaking off the earth wire it should not be pulled all the way
out.
– Mark the original contact position.
NOTICE
Never attempt to remove the contacts from the front of the bent rail, as this will damage
the glass body. Do not pull on the cables.
7Bühler Technologies GmbHBE200006 ◦ 01/2022
NS 1-G1/2-AM
– Carefully slide the contacts to the desired position on the bent rail. Use a small screwdriver or similar tool to do so. Use a drop
of oil if the contacts are very tight. Please note the minimum spacing!
If the contacts are configured as NO contact (NO) or NC contact (NC), the contact function can be reversed by turning the con-
tacts 180°. There is a red mark on the housing indicating the "NO contact" function. The contact logic assumes the level switch is
installed in an empty tank, i.e. it is only in the operating position once filled.
NO contact function
with rising level (NO)
NC contact function
with rising level (NC)
Red marking down
Red marking up
– To reverse the switching function, slide the contact out the top or bottom of the bent rail, turn 180° and slide back in, and
slide into the desired position.
– If the earth wire was pulled out of the protective tube, first insert this wire into the protective tube.
– Make a loop of the additional cable length and carefully slide the bent rail back in.
– Screw on the plug base. For plugs with screw-in thread, attach the plug base clean and screw in hand tight. Leave the pin in-
sert free so the base can turn around the cables. Now slide the cables all the way in, lock the pin insert into the guide and
slide all the way in. Tighten the top hexagon ring hand tight.
8 Bühler Technologies GmbH BE200006 ◦ 01/2022
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