HMA Instrumentation offers a range of economically-priced 63 mm, 100 mm, and 150 mm nominal size pressure gauges. Pressure gauges from HMA Instrumentation are ideally suited to most industrial applications where accuracy and durability is required.

Rototherm DG1 DigiGauge Digital Pressure Gauge & Transmitter

High accuracy and a four-digit display enables the Rototherm DG1 DigiGauge from HMA Instrumentation to be used as a digital standard test gauge, replacing less accurate analogue test gauges, which also have the disadvantage of being more fragile. HMA Instrumentation is able to supply factory-calibration certificates traceable to National Standards. In addition, UKAS calibration certificates can be supplied if required.

Covering a wide range of test and measurement applications with pressure ranges available from vacuum to 400 bar, the Rototherm DG1 DigiGauge from HMA Instrumentation can be supplied with hygienic fittings for food-and-beverage applications, or with diaphragm seals for use on corrosive, viscous, or crystallising fluids.

All standard Rototherm DigiGauges from HMA Instrumentation are calibrated in a controlled environment. Temperature compensated sensors are fitted as standard to automatically correct zero and span drift. All Rototherm DigiGauge variants from HMA Instrumentation can also be specified with a ‘maximum’ and ‘minimum’ pressure logging option.

Rototherm DSU Diaphragm Seal Units

HMA Instrumentation recommends to fit a Rototherm DSU Diaphragm Seal Unit to a pressure gauge where the medium to be measured is highly viscous, contains suspended solids, or is potentially corrosive to the Bourdon tube. Rototherm DSU Diaphragm Seal Units from HMA Instrumentation are normally connected directly to the gauge. However, a connection may be also be affected by flexible capillary, which makes them ideal for remote pressure indication.

The flexible capillary can be used to facilitate the fitting of a Rototherm DSU Diaphragm Seal Unit from HMA Instrumentation in a surface- or panel-mounting location. The maximum capillary length is 5 m. Pressure is transmitted from the Rototherm DSU Diaphragm Seal Unit to the Bourdon tube by means of a suitable filling medium, the selection of which ensures compatibility with the process and process temperature.

If the Rototherm DSU Diaphragm Seal Unit from HMA Instrumentation is to be used on processes subject to temperature extremes, the temperature at the tipping point should be advised at the time of ordering. Rototherm DSU Diaphragm Seal Units from HMA Instrumentation can be fitted directly or remotely to the following Rototherm gauge types: SPG, RPG, DMC, SPGA, and turret gauges.

Rototherm DMC-Cased Pressure Gauges

HMA Instrumentation recommends Rototherm DMC-Cased Pressure Gauges as the ideal instruments for on- and offshore petrochemical applications. DMC (Dough Moulded Compound) material has a high resistance to atmospheric and chemical corrosion and high temperatures, being able to withstand 160ºC direct heat without distortion. Rototherm DMC-Cased Pressure Gauges from HMA Instrumentation are safety-pattern gauges, featuring a solid front and blow-out back.

Rototherm DMC-Cased Pressure Gauges from HMA Instrumentation are available in either 100 mm or 150 mm nominal sizes. Another option offered is damped movement to reduce the effects of vibration. The backplate features a specially-designed membrane that forms a perfect seal every time, thus compensating for any atmospheric changes that could affect the calibration of the gauge.
DMC-Cased Pressure Gauges from HMA Instrumentation feature a truly integral baffle wall between the gauge internals and dial. An added advantage is that there is no dependence on welding or other joining methods, as used previously in traditional safety-pattern gauge construction. The SafeCase blow-out back feature affords even greater operator protection, over and above the requirements of EN837. Being retained on the gauge by a centre screw, it prevents the risk of injury due to flying debris from the rear of the case in the unlikely event of tube failure.

Rototherm SPGB Pressure Gauges

The Rototherm SPGB Pressure Gauges from HMA Instrumentation are designed for accurate pressure measurement. These gauges boasts a reliable, robust design, making them ideal for arduous industrial purposes. The main application of the Rototherm SPGB Pressure Gauges from HMA Instrumentation is pressure measurement in boilers and tanks.

The nominal sizes of the Rototherm SPGB Pressure Gauges from HMA Instrumentation is 200 mm, 250 mm, and 300 mm. The casing is mild steel, with a bezel, and painted black. The window is a safety glass for added protection. Mounting is from the surface (bottom-entry). All wetted parts are AISI 316 stainless steel block, with a Bourdon tube. The range is zero to 120 bar.

Rototherm RPG Pressure Gauges

HMA Instrumentation has a range of economically-priced 63 mm, 100 mm, and 150 mm nominal size Rothotherm RPG Pressure Gauges ideally suited to most industrial applications where accuracy and durability is required.

The Rothotherm RPG Pressure Gauges from HMA Instrumentation are available with either stainless steel or Monel (100 mm and 150 mm dial size only) internals. A number of optional accessories are available either as factory-fitted or retro fitted. These include diaphragm seal units, electrical contact head systems, syphons, overrange protectors, snubbers, and additional pointers.

The case is 304 stainless steel, with 316 available as an option. The bezel is a stainless steel bayonet-type, while the window is standard instrument glass, with HMA Instrumentation offering laminated safety glass or even Perspex if required. Ingress protection is IP65 as per EN 60 529/IEC 529.

Rototherm SPG Pressure Gauges

Rothotherm SPG Pressure Gauges from HMA Instrumentation are designed for accurate pressure measurement. Features include a reliable, robust design that renders thes gauges ideal for industrial applications. Nominal sizes are 100 mm and 150 mm. The case is 304 Grade stainless steel, with a solid front and a blow-out back, with 316 available as an option.
The dial is aluminium, with black lettering on white, in accordance with EN837-1. The window is safety glass or electrical contact head. Mounting is direct mount (bottom entry), surface mount (bottom entry), or panel mount (rear entry). The filling is dry gauge (glycerine fillable) or glycerine filled.

The pointer is aluminium black (standard or micro adjustable), while the wetted parts are AISI Grade 316 stainless steel block and Bourdon tube or Monel to NACE MR-01-75. The range of the Rothotherm SPG Pressure Gauges from HMA Instrumentation is -1 to 1 000 bar.

Rototherm SPGA Pressure Gauges

The Rototherm SPGA Pressure Gauges from HMA Instrumentation are used predominantly in power generation, and marine and defence applications. These safety-pattern pressure gauges form the basis of the Rototherm range available from HMA Instrumentation.

The Rototherm SPGA Pressure Gauges from HMA Instrumentation are also available as Class 0.25 accuracy test gauges with 150 mm, 200 mm, 250 mm and 300 mm dial sizes (the latter feature a steel case). The sluminium cased gauge is a full safety-pattern pressure gauge with a solid front and full blow-out back.

The Rototherm SPGA Pressure Gauges from HMA Instrumentation have a full safety pattern to EN837-1, Class 1 Accuracy to EN837, and are also available to the latest issue Defence Standard 66/2. The case and bezel are aluminium, with an integral baffle between the dial and the Bourdon tube. A brass bezel is available for the Defence Standard version only. A rear blow-out disc is fitted in the gauge case back. Standard gauges are painted black, while Defence Standard gauges from HMA Instrumentation are supplied painted in Admiralty Grey, in accordance with BS381C.

Rototherm Turret-Style Gauges

Rototherm Turret-Style Gauges from HMA Instrumentation are used extensively in harsh environments, such as those found mainly in chemical and offshore industries. As part of their design, these Turret Gauges are suitable for both direct and surface mounting. Moulded spacer legs at three fixing points allowing the back to blow out, even if the gauge is surface-mounted.
The phenolic case of the Rototherm Turret-Style Gauges from HMA Instrumentation has a high resistance to atmospheric and chemical corrosion, a full safety pattern to EN837, available with stainless steel or Monel wetted parts, and Class 0.5 accuracy to EN837 (dry gauges).