SCH-VCM/SCH-VNM Vacuum Switch

Brand: KOBOLD Instruments, Inc.

The negative pressure switches detect the pressure difference relative to the atmospheric pressure.

All data on switching pressure ranges and therefore also the scale division the switch units are to be understood at the difference in pressure between the atmospheric pressure at any one time and the set switching pressure.

The "zero" reference point on the scale of the unit corresponds to the atmospheric pressure at the time. The minus sign by the indicated pressure stand for under-pressure below the respective atmospheric pressure.

Specifications

Ambient Temperature Range

  • -25° to 70° C (-13° to 158° F) - Maximum

BSP Connection

  • External Thread G 1/2" A (Pressure Gauge Connection) According to DIN 16 288
  • Internal Thread G 1/4" to ISO 228

Diaphragm Material

  • NBR

Element

  • 304L Stainless Steel - Sensor Casing
  • 316Ti Stainless Steel - Metal Bellows
  • 430F Stainless Steel - Sensor Casing
  • Cu Zn - Metal Bellow & Sensor Casing

Enclosure / Body Material

  • Rugged Housing of Seawater Resistant Aluminum Die Casting GD Al Si 12 - Switching Device

Environmental Protection

  • IP54, with Vertical Fitting Position

Mounting

  • Vertically Upwards & Horizontal VCM 4156 Vertically Upwards

Process Fitting Details

  • Directly in the Pressure Line (Pressure Gauge Connection) or on a Flat Surface with 2 - Off 4 mm Screws

Set Point - Decreasing

  • bar: -1 to 0.5
  • kPa: -100 to 50
  • mbar: -1,000 to 500
  • psi: -14.5 to 7.25

Set Point - Increasing

  • bar: -1 to 0.5
  • kPa: -100 to 50
  • mbar: -1,000 to 500
  • psi: -14.5 to 7.25

Switch Type

  • Single-Pole Change-Over Switch

System Pressure

  • bar: 6
  • kPa: 600
  • mbar: 6,000
  • psi: 87

Temperature Range

  • 85° C (185° F) - Maximum

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