MNR 300 – AD672/681 (Ex)

Autonomous high pressure supply and adjustment system for Additel 68X / 681IS and 672 digital pressure gauges

  • Designed for use with Additel 681 and 672 digital pressure gauges
  • Supports pressure ranges with full scale from 20 MPa down to 0.7 MPa in a single system
  • Simple, compact and easy to operate
  • Built-in refillable 28 MPa storage tanks for pressure supply
  • Precise test pressure control using a pressure balanced volume controller
  • Protected against overpressure
  • Three analogue pressure gauges for monitoring pressure in storage system, regulated supply pressure and pressure at test ports
  • Two test ports
  • 316 SS high pressure tubing and fittings

Additional option: ATEX certified version available for controlling conditions in an explosive atmosphere

Watch the product demonstration video:


Technical Specifications

Pressure ranges  See Additel 68X or 672, digital pressure gauges supported table page 3
Pressure measurement specs  See Additel 68X or 672, digital pressure gauges supported table page 3
ATEX zone  II 3G Ex ic IIB T6 Gc (-10°C < Ta +50°C)
MNR 300 control range  0 - 20 MPa gauge pressure
Gas storage system  2 x 1 litre capacity, filling pressure limited to 28 MPa, tested to 45 MPa
Monitor gauges  40 mm, analogue, all stainless steel:
 gas bottle pressure, regulated supply pressure, pressure at test port
Pressure regulator  Minerva Model 180 high pressure regulator, Range 0 - 25 MPa
Volume adjuster  Minerva Model 90, pressure balanced volume adjuster, displacement 11 cm3 max 67 turn, precise pressure setting to within 100 Pa, stainless steel interior
Needle valves  Fine control valve for test pressure inlet and exhaust
Connections  Low volume Minimess 1215, quick connect couplings with internal check valve
Test / filling hose  Minimess 1215, length 2 meter, including 1⁄4" NPT male connector
Refill connection  For connection to nitrogen bottle, standard RU-3
Quick lock system in lid  Quick lock system for storing test hose and test connector
Housing  Pelicase. Material: ultra high impact copolymer
Dimensions  405 x 295 x 255 mm (L x W x H)
Weight  Approx. 19 kg
Certification  Pressure Equipment Directive (PED), Transportable Pressure Equipment Directive (TPED), CE conformity declaration
Accessories included  2 meter test / filling hose, 1⁄4" NPT male test adaptor, RU-3 refill connection
Documentation included  Manual, PED conformity declaration, TPED conformity declaration, CE declaration
Ordering code  MNR-300-AD68x/672
Ordering code ATEX version  MNR-300-AD681-ex



Model Name


MNR 300-AD672/68X  Autonomous high pressure supply and adjustment system for Additel 68x and 672 digital pressure gauges
MNR 300-AD681 Ex  Atex certified, Portable pneumatic high pressure supply and adjustment system


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