Operating Instructions for
Float Switches for Liquids
Model: NSP
NSP
1. Contents
1. Contents........................................................................................................2
2. Note ..............................................................................................................3
3. Instrument Inspection....................................................................................3
4. Regulation Use..............................................................................................3
5. Operating Principle........................................................................................4
6. Mechanical Connection.................................................................................4
7. Electrical Connection ....................................................................................5
8. Maintenance .................................................................................................5
9. Technical Information....................................................................................6
10. Order Codes .................................................................................................6
11. Dimensions ...................................................................................................7
12. Recommended Parts ....................................................................................7
13. Declaration of Conformance .........................................................................8
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: +49(0)6192-2990
Fax: +49(0)6192-23398
E-Mail: [email protected]
Internet: www.kobold.com page 2 NSP 03/06
NSP
2. Note
Please read these operating instructions before unpacking and putting the unit into operation. Follow the instructions precisely as described herein.
The devices are only to be used, maintained and serviced by persons familiar with these operating instructions and in accordance with local regulations applying to Health & Safety and prevention of accidents.
When used in machines, the measuring unit should be used only when the machines fulfil the EWG-machine guidelines.
3. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of the delivery packaging. In case of damage, please inform your parcel service / forwarding agent immediately, since they are responsible for damages during transit.
Scope of delivery:
The standard delivery includes:
• Float Switches for Liquids
• Operating Instructions model: NSP
All the parts, which are standard scope of delivery, are included in the assembled unit. The accessory parts such as terminal connections and ballast weight are separately packed.
4. Regulation Use
Any use of the Float Switch for Liquids, model: NSP, which exceeds the manufacturers specification, may invalidate its warranty. Therefore any resulting damage is not the responsibility of the manufacturer. The user assumes all risk for such usage.
The model NSP are used to monitor liquid-levels. Only those liquids may be measured, against which the materials used in the construction of the unit are resistant.
By making use of two float switches, one for the minimum level and one for the maximum level, liquid-level control for a system can be implemented.
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5. Operating Principle
The float comprises a hollow cylinder or a ball with integrated mercury switch or microswitch.
The contact is supplied as a changeover contact; it can be connected as a N/O contact or N/C contact as an option. The contact switches when the liquid passes above or below the horizontal float position.
The switch point is set by the side installation of the switch at the desired position or by clamping the cable. The switch point is set using weights when installed at the top.
6. Mechanical Connection
Before installation:
• Ensure that the permitted maximum pressure and temperature defined for the unit are not exceeded. (see 9. Technical Information).
• With open tanks the float switch should be lowered into the tank from the top.
The cable should be firmly held through a suitable cable-grip. Firm placement of the float switch is carried out through ballast-weight, or cable-clamps on a guide-pipe where a cable length of 50 mm between the clamp and the float has to considered.
• With closed, pressure-less tanks, installation of float-switch is carried out by means of a threaded cable gland, with R1 screw-in thread (accessory), sidewise and through the wall.
In order that the float-switch may not be obstructed during its float-movement, at least 50 mm cable-length between retaining-grip and the float-switch must be allowed. page 4 NSP 03/06
NSP
7. Electrical Connection
• Ensure that the supply lines are powerless.
• Connect the supply lines corresponding to desired switching function, with the float switch cable.
• The cable-junction should be made through a suitable connection-socket and be protected against physical contact and moisture.
Attention! If there are any doubts regarding compliance to electrical specifications, or any probable danger arising through physical contact, in case of a rupture, a fault-current protection is recommended against indirect touching according to EN 50178.
After connecting external units with limit-contacts, all connection-work is complete. The unit can now be put in operation.
8. Maintenance
This float switch is almost a maintenance-free unit.
Occasionally, the cable should be inspected for damage. A float switch with damaged cable must be immediately replaced.
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NSP
9. Technical Information
Float material:
Cable: polypropylene standard 4 m TPK cable (3 x 0.75mm²,
thermoplastic optional: silicone, FEP cable
Max. pressure:
Max. temperature:
Medium density:
Contact:
Switch capacity: model NSP-S: 1 bar model NSP-K: 2 bar
5...60 °C (TPK cable)
5...85 °C (silicone-/ FEP cable) model NSP-S: > 0.9 kg/ dm model NSP-K: > 0.6 kg/ dm
3
3 changeover contact, connectable as
Switching Hysteresis: switching angle:
N/C or N/O contact max. 250 V
AC
/ 150 V
DC
, 300 VA, 60 W
1 mA...1,5 A, 1 A at cos ϕ 0,7 approx. 25 mm (TPK) approx. 35 mm (FEP) approx. +12° / +3°
IP 68 Class of protection:
10. Order Codes
Order details (Example: NSP-S W 04TPK)
Model Design
NSP-
S = Stem form
K = Ball form
Contact
W = changeover contact
Cable
04TPK = 4 m TPK-cable
YYSIL = Silicone cable, min. 2 m
YYFEP = FEP-cable, min. 2 m
Order details (Example: NSP-weights)
Model Description
NSP-weights
NSP-connection 1 PVC
NSP-connection 2 PVC
NSP-connection 1 MS
Bading weights
PVC-cable gland G1
PVC-cable gland G2
Brass cable gland G1 page 6 NSP 03/06
11. Dimensions
NSP
12. Recommended Parts
The float switch can be replaced only as a complete unit.
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13. Declaration of Conformance
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole responsibility that the product:
Float Switches for Liquids Model: NSP-... which relates to this certificate, conforms to the standards listed below:
EN 61010
EN 61326
Following EWG guidelines are also fulfilled:
73/23 EWG
89/336/EWG
93/68 EWG
Hofheim, 15. March 2006
H. Peters
General Manager
M. Wenzel
Proxy Holder page 8 NSP 03/06
