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P91/CFN Schaffer Diaphragm Gauge

P91 CFN Schaffer Diaphram SealSchaffer 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 enable 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 measured is of a hygienic and or foodstuff nature.

Versions are available to withstand pressure pulsations, vibrations and operation at very high temperatures.

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The Budenberg P91CFN specifications

Size 150mm (6")
Mounting Direct
Case & Bezel DMC (Dough Moulding compound) is glass-reinforced polyester with central partition and blow out back. It has extremely high impact strenght, 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
Units will withstand overload pressure up to 125% of FSD
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, whre this is not required
Connection Material
316L Stainless Steel as standard
Options: Carbon Steel, Monel, Titanium, Hastelloy, Tantalum
Lining Options: PTFE, Halar, PDA
Diaphragm Material
316 Stainless Steel as standard
Options: Monel, Titanium, Hastelloy, Silver or PTFE Protected
Other Materials to suit application are available
Accuracy Class
1.0% of FSD as defined in EN837-1
1.5% of FSD if diaphragm is protected
Pressure Range
The welded seal units is available in a range of configurations dependant 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.
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.
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 available on request.
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
Environmental Rating
IP67 as defined in EN 60 529
Operating:  -20 to +90°c
Storage:  -40 up to +100°c 
For lower or higher operating temperatures, please contact our office 
Certification & Traceability
All instruments are individually calibrated and have an unique Serial Number Printed on Dial.
Certificate of Conformity traceable to National Standards is supplied
BS EN 10204 3.1B Material Certification
Point by Point Test Certificate
Safety All units are manufactured to comply with EN837-1, S3 Specification and other regulatory standards including PED.



 P91CFN Dial Specifications

Size 150mm (6")
White Anodised Aluminium marked in black finish
Dual Scale, bands, sectors are also available.
Customisation with Company Name or Logo.
Stainless steel coloured black
Option: Micrometer adjustable pointer for Ranges > 350 mBar
Stainless steel construction
Laminated Safety Glass
Option: Acrylic Plastic Window


P91 / CFN Specification Sheet Download

To view all the information on the Budenberg P91CFN you can download the data sheet here