Bourdon tube pressure gauge for diaphragm seal operation, NS 100

Type series BH42

  • EX
Bourdon tube pressure gauge for diaphragm seal operation, NS 100 - BH42


  • Bourdon tube pressure gauge for diaphragm seals
  • Nominal ranges 0…4 to 0…400 bar, -1...3 bar to -1...15 bar
  • High quality case with bajonet ring NS 100
  • Case and measuring element of stainless steel
  • Degree of protection IP 65
  • Accuracy class 1.0 as per EN 837-1
  • Small temperature error by means of reduced-volume measuring element
  • Operating temperature up to 140°C
  • Process connection via diaphragm seal product group D5
  • Instrument connection welded with diaphragm seal


  • Explosion protection (ATEX) for mechanical devices
  • Certificate of measuring equipment for Russian Federation
  • Material certificate per EN 10204
  • Calibration certificate per EN 10204
  • Damping of movement
  • Electrical contact device, see data sheet D3-025 (depending on design)
  • Electronical angle-of-rotation sensor, see data sheet D6-020
  • Connection to Zone 0 by using the flame arrester MF21xx, see data sheet D6-025
  • Case with liquid filling and degree of protection IP 66
  • Extended neck tube
  • EAC declaration (upon request)

Technical Data

Constructional design / case
Design: High quality case with bayonet ring,
material: st.steel mat.-no. 1.4301 (304)
ventilation valve, material: PUR
High quality case with bajonet ring per EN 837-1 S1, with case filling, blow-out device (material: PUR) and internal pressure compensation diaphragm (material: silicone)
Nominal size: NS 100
Degree of protection per EN 60529: - Without case filling: IP 65
- With case filling: IP 65
- With case filling and internal pressure compensation diaphragm: IP 66
Case filling: Option: Glycerine-water Further liquid fillings upon request.
Atmosph. pressure compensation: degree of protection IP 65:
Via ventilation valve.
  degree of protection IP 66:
To atmosphere via internal pressure compensation diaphragm
Case seal: Material gasket: NBR
Window: Non-splintering laminated glass.
Option: Non-splintering plastic (Macrolon)
Measuring element: Bourdon tube
< 60 bar: c-type
≥ 60 bar: spiral
Movement: Stainless steel segment
Optional: movement with integrated damping system
Scale: Pure aluminium, white with black inscription.
Option: with red marking, special scale upon request.
Pointer: Pure aluminium, black.
With micro adjustment for zero point cor-rection.
Weights: NS 100 without filling: approx. 0.7 kg
NS 100 with filling: approx. 0.9 kg
Process connection
Design: With internal diaphragm seal, see order details and product group D5
Nominal range
See order details, other ranges upon request  
Overload protection: standard: 1.3 times
higher overload protection see order details
Accuracy class: 1.0 per EN 837-1
Temperature influence: Max. ± 0,4% / 10K of measuring span per EN 837-1
Temperature influence: Temperature error due to diaphragm seal system.
  - dM 22.6…24 mm ≤ 45 mbar / 10 K
- dM 27…30 mm ≤ 25 mbar / 10 K
- dM 34…36 mm ≤ 8 mbar / 10 K
- dM 40…46 mm ≤ 5 mbar / 10 K
- dM 51…58 mm ≤ 2 mbar / 10 K
  A detailed calculation of accuracy can be submitted upon request.
Deviations in case of special materials.
Temperature ranges
Temperature ranges for the design of the diaphragm seal system (in combination with the pressure transmission fluid FD1):
Ambient: -10...50 °C
Media: -10...140 °C
Adjusted design temperature ranges within the following maximum values are possible on request:
Ambient without filling: -20...60 °C
Ambient with filling: -20...50 °C
Media without filling: -40...230 °C
Media with filling: -40...190 °C
Temperature ranges for storage:
Storage without filling: --40...70 °C
Storage with filling: -40...70 °C
The maximum values can be restricted by the following parameters:
- diaphragm size
- measuring range
- diaphragm liquid filling
Extended temperature range upon request.
Tests and certificates
See documents
Type series
BH4200, BH4210, BH4220, BH4230, BH4240, BH4250


  • D2-029

    Data Sheet

  • BA_008

    Operating Instruction

  • XA_005

    Ex Instructions

  • KE_053

    Declaration of Conformity