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Summary of Contents for Kobold SCH-27
- Page 1 Operating Instructions Pressure Switch Model: SCH-27/SCH-28...
- Page 2 The document may contain technical inaccuracies and typographical errors. The content will be revised on a regular basis. These changes will be implemented in later versions. The described products can be improved and changed at any time without prior notice. © Copyright All rights reserved. page 2 SCH-27/-28 K04/0722...
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Page 3: Table Of Contents
11. Technical Information .................. 15 12. Order codes ....................17 13. Dimensions ....................19 14. Disposal ...................... 23 15. EU Declaration of Conformance ..............24 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: info.de@kobold.com Internet: www.kobold.com... -
Page 4: Note
Please read these operating instructions before unpacking and putting the unit into operation. Follow the instructions precisely as described herein. The instruction manuals on our website www.kobold.com are always for currently manufactured version of our products. Due to technical changes, the instruction manuals available online may not always correspond to the product version you have purchased. -
Page 5: Regulation Use
SCH-27/-28 4. Regulation Use Any use of the Pressure Switch, model: SCH-27 or SCH-28, which exceeds the manufacturer’s specification, may invalidate its warranty. Therefore, any resulting damage is not the responsibility of the manufacturer. The user assumes all risk for such usage. - Page 6 -This manual does not concern the instruments conforming to standard 2014/34/EU (ATEX). -The product warranty is no longer valid in case of non- authorized modifications and of wrong use of the product. -The user is totally responsible for the instrument installation and maintenance. page 6 SCH-27/-28 K04/0722...
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Page 7: Installation
All instruments should be mounted in a vertical position unless otherwise shown on the label. In order to make the instrument dismounting easier it is recommended to mount a shut-off valve between the system and the instrument. SCH-27/-28 K04/0722 page 7... -
Page 8: Electrical Connection
SCH-27/-28 6. Electrical Connection Pressure switches type: SCH-27 are equipped with micro-switch suitable for direct connection through fork wire terminal screws and clamp for ground connection both internal and external provided of cable terminal. Differential pressure switches model SCH-28 are provided of internal terminal blocks with screws terminals (Figure 5) with cables whose maximum section should be di 2.5 mm²... -
Page 9: Set Point Calibration
1 microswitch considering that these operations should be repeated for one micro-switch at a time alternatively until the desired operation accuracy is reached. This is necessary because the two micro-switches interaction on the same measuring instrument. SCH-27/-28 K04/0722 page 9... -
Page 10: Commissioning
All obstruction of the sensing element pressure abduction pipe should be avoided in order to prevent any repeated and unnecessary rearm of the micro-switch. In case of malfunction, the instrument must be completely depressurized and isolated through a shut-off valve before removal. Figure 7 page 10 SCH-27/-28 K04/0722... -
Page 11: Working Limits
If this occurs, the case surface and the sheath temperature could increase making the installation unsafe. According to the micro-switch model, it is necessary to consider the differential value between the working pressure and the restored one. SCH-27/-28 K04/0722 page 11... -
Page 12: Differential
The crack can be more dangerous if it happens during compressed and liquid gas measuring because the sensing element leaks slowly so that the pressure inside the case increases and the safety gasket opens. page 12 SCH-27/-28 K04/0722... -
Page 13: Failure For Overpressure
Stress for vibrations Wide amplitude vibrations could also break the sensing element structure and lead to a process fluid leakage. SCH-27/-28 K04/0722 page 13... -
Page 14: Mechanical Stress
In case of positive outcomes, the control interval can be increased. In case of negative results, it should be decreased. KOBOLD will not be responsible for any non authorized intervention on the instrument. Moreover, the contract warranty and the CE Conformity Declaration will be no longer valid. -
Page 15: Technical Information
AISI 316 stainless steel diaphragm AISI 321 stainless steel bellows (SCH-28) Gasket: PTFE Flushing plugs: AISI 316 stainless steel Case: AISI 304 stainless steel Cover: AISI 304 stainless steel, bayonet lock Tag: AISI 304 stainless steel, etched SCH-27/-28 K04/0722 page 15... - Page 16 SCH-27/-28 Setting ranges SCH-27 Code Setting range Test Special Differential Differential pressure overrange 1 micro 2 micro (code H) 0.7...6 mbar 10 mbar 0.5 mbar 1...16 mbar 20 mbar 0.8 mbar 2...25 mbar 30 mbar 1.2 mbar 5...40 mbar 0.5 bar...
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Page 17: Order Codes
SCH-27/-28 12. Order codes Order Details SCH-27 (Example: SCH-27 C2 A I2 1 N) Model Setting range Microswitch type Process Electrical Options connection (F) connection (F1) …F7…= 0.7...6 mbar …A = standard, single N = none …F8…= 1...16 mbar …B = standard, …F9…= 2...25 mbar... - Page 18 0.1 A goldplated 0.1 A inert gas filled 15 A 15 A 0.1 A goldplated and 0.1 A inert gas filled adjustable 20 A 20 A 0.1 A differential inert gas filled V 15 A 15 A page 18 SCH-27/-28 K04/0722...
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Page 19: Dimensions
SCH-27/-28 13. Dimensions Diaphragm Pressure Switch Model SCH-27 ½“ NPT M, cable exit ½“ NPT F, with 2” bracket yoke mount (ranges >0.6 bar) SCH-27/-28 K04/0722 page 19... - Page 20 SCH-27/-28 ½“ NPT M, cable exit ½“ NPT F, with wall bracket (ranges >0.6 bar) ½“ NPT M, cable exit ½“ NPT F, with 2” bracket yoke mount (ranges ≤0.6 bar) page 20 SCH-27/-28 K04/0722...
- Page 21 I2 = R ¼-18 NPT F 2 = R ¾ ISO 7/1 N4 = ½ -14 NPT 3 = ½-14 NPT I4 = ½-14 NPT F 4 = ¾-14 NPT G4 = G ½ A A = M20 x 1.5 SCH-27/-28 K04/0722 page 21...
- Page 22 SCH-27/-28 Example with cable entry ½“ NPTF and process connection ¼“ NPTF with wall bracket page 22 SCH-27/-28 K04/0722...
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Page 23: Disposal
(Cd, Hg, Li or Pb) of the heavy metal that is decisive for the classification as containing pollutants: 1. „Cd" stands for cadmium 2. „Hg" stands for mercury 3. „Pb" stands for lead 4. „Li" stands for lithium Electrical and electronic equipment SCH-27/-28 K04/0722 page 23... -
Page 24: Eu Declaration Of Conformance
SCH-27/-28 15. EU Declaration of Conformance We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole responsibility that the product: Pressure Switch Model: SCH-27, SCH-28 to which this declaration relates is in conformity with the standards noted below: EN 60947-1:2007/A1:2011/A2:2014...
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