Schaffer Diaphragm Gauge, DMC Plastic Case with Flanged Connection
The Budenberg model P91/CFN Schaffer Diaphragm Gauges have been manufactured with a special DMC (Dough Moulding Compound) safety case and have been designed for use on slurries, viscous or corrosive fluids that would normally attack or block standard bourdon tubes.
Implementing specialist materials for both the connection and diaphragm enables the Shaffer Diaphragm gauge to be configured for use on any gaseous or liquid media including suspended solids or powders. The direct drive from the diaphragm to the movement ensures a more positive indication of pressure than other models of tube gauges.
The P91/CFN offers a full range of flanged connection sizes and materials, Schaffer Diaphragm gauges can operate at pressure ranges as low as 30 mBar with the option to permit units to withstand a maximum pressure of 70 bar.
contact us for pricing and availability of the Budenberg P91/CFN Diaphragm Seal Gauge
The Budenberg P91/CFN is suitable for the following applications/industries
Designed for continuous operation on gases or liquids where the product to be measured is of a hygienic and or foodstuff nature.
Versions are available to withstand pressure pulsations, vibrations and operation at very high temperatures.
 Oil & Gas
Pressure Gauge
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 Pharmaceutical
Pressure Gauge
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 Chemical
Pressure Gauge
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 Power Generation
Pressure Gauge
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 Water & Waste Water
Pressure Gauge
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The Budenberg P91CFN specifications
| Size | 150mm (6") |
| Mounting | Direct |
| Case & Bezel | DMC (Dough Moulding compound) is glass-reinforced polyester with a central partition and blow-out back. It has extremely high impact strength, it is self-extinguishing. |
| Scale Ranges |
0 to 30 mBar up to 25 Bar Pressure / Compound ranges
Equivalent units of pressure/vacuum available
Single and Dual scales are available
Option: Custom scales for special applications, ie: tank contents
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| Overload |
Units will withstand overload pressure up to 125% of FSD
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| Pressure Connection | Flange Sizes 1/2", 3/4", 1", 1/5", 2" |
| Rated 150, 300, 600, 900 and 1500, raised face | |
| Also available: DN15, DN20, DN25, DN40 and DN50, PN10-40 and 1/2", 3/4", 1", 1.5", 2" Table A-E | |
| All connections have a Bobin Neck assembly except flanges 1/5" and 2" 900/1500RF and DN50, where this is not required | |
| Connection Material |
316L Stainless Steel as standard
Options: Carbon Steel, Monel, Titanium, Hastelloy, Tantalum
Lining Options: PTFE, Halar, PDA
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| Diaphragm Material |
316 Stainless Steel as standard
Options: Monel, Titanium, Hastelloy, Silver or PTFE Protected
Other Materials to suit the application are available
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| Accuracy Class |
1.0% of FSD as defined in EN837-1
1.5% of FSD if the diaphragm is protected
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| Pressure Range |
The welded seal units are available in a range of configurations depending on the required Dial Size and Operating Pressure range as follows:
Ranges 0 to 1 Bar up to 0 to 40 Bar.
Other pressure units are available on request.
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| Over Range Protection |
All units will withstand 130% overload as standard up to 40 Bar. Optionally the diaphragm can be set to 'lock off' allowing the unit to withstand an overload up to the maximum pressure rating of the seal unit. This unique feature can be used to avoid the use and cost of additional overload protection valves.
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| Materials of Construction | Due to the welded construction, all materials including the diaphragm and connection have to be the same material.
Standard - 316L Stainless Steel
Other materials are available on request.
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| Process Connections |
1" ISS / IDF including nut
1 1/2" ISS / IDF including nut
2" ISS / IDF including nut
3" ISS / IDF including nut
1 1/2" Triclamp / Triclover in Hastelloy C276
2" Triclamp / Triclover
3" Triclamp / Triclover
1" DIN 11851
2" RJT
Others are available on request
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| Environmental Rating |
IP67 as defined in EN 60 529
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| Temperature |
Operating: -20 to +90°c
Storage: -40 up to +100°c
For lower or higher operating temperatures, please contact our office
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| Certification & Traceability |
All instruments are individually calibrated and have a unique Serial Number Printed on Dial.
A certificate of Conformity traceable to National Standards is supplied
BS EN 10204 3.1B Material Certification
Point-by-Point Test Certificate
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| Safety | All units are manufactured to comply with EN837-1, S3 Specification and other regulatory standards including PED. |
P91CFN Dial Specifications
| Size | 150mm (6") |
| Dial |
White Anodised Aluminium marked in black finish
Dual Scales, bands, and sectors are also available.
Customisation with Company Name or Logo.
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| Pointer |
Stainless steel coloured black
Option: Micrometer adjustable pointer for Ranges > 350 mBar
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| Movement |
Stainless steel construction
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| Window |
Laminated Safety Glass
Option: Acrylic Plastic Window
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P91 / CFN Specification Sheet Download
To view all the information on the Budenberg P91CFN you can download the datasheet here