Engineering


Pressure measurement in agriculture

Bourdon tube pressure gauges for agricultural field sprayers (AppBe_M_086)

for manufacturers of field sprayers, service workshops
Fields of application Pressure Measurement in Agriculture Armaturenbau Manotherm
In agriculture, sprayers for fertilisers or insecticides/pesticides are used. These constructions have to withstand difficult operation conditions.

The problem:

Due to small nozzle cross sections, which moreover tend to clog, the pressure can exceed the normal operating pressure considerably when starting abruptly.

Our solution:

For this application, our instruments are protected particularly against overpressure. In the working area, the scale is divided linearly up to approx. 230°. Beyond that, the overpressure area starts, which reaches a pointer movement of 270°. Precise reading in the working area and simultaneous overpressure protection of the pressure gauge is possible.

Bourdon tube pressure gauge RKG 63 or 100 Armaturenbau Manotherm

Our instrument in detail:

Robust version and overpressure protection:
Bourdon tube pressure gauge RKG 63 or 100

 
  • Wetted parts brass/bronze or for aggressive media 316 L stainless steel
  • Wear resistant movement
  • Case filling glycerin
  • Robust plastic screw ring case
  • Other cases upon request, e. g. bayonet ring case stainless steel
  • Damping device against sudden impacts when starting the pump
  • Scale with linear division, e.g. 0 – 5 bar over 235°, and overpressure range with 5 – 25 bar of 235 – 270°
  • Coloured spans on the scale (green, red or the like)



Pressure measurement in the automotive industry

Bourdon tube pressure gauges for filling levels in the automotive industry (AppBe_M_087)

for manufacturers of filling systems
Fields of application Pressure Measurement in the Automotive Industry Armaturenbau Manotherm
There are many fields in the automotive industry where pressure measuring instruments are used. The range of applications is very diverse, and the requirements are very specific. This application is about filling of vehicles with various aggressive media.

The problem:

The filling of vehicles with fluid media (e.g. brake fluid, motor and gearbox oil, cooling agent, fuel) presents a challenge. At the filling stations a mist forms, which emits into the environment. These media are partially aggressive. Therefore, all nonmetallic outer parts of the pressure gauges (window, blow-out, sealings) have to meet higher demands. The resistance of these materials has to be guaranteed. Nonobservance can lead to leakage of the case filling.

Our solution:

In consultation with our customers, following materials have proven themselves in most cases:
 
  • Window: laminated safety glass
  • Sealant: Viton, PTFE or others
  • Blow-out: metallic blow-out

In addition, our pressure gauge has a crimped-on ring case. It is better suited for this application than a bayonet ring case, as the sealing is encapsulated in the crimped-on ring.

Bourdon tube pressure gauge RChgG 63 – 1 Armaturenbau Manotherm

Our instrument in detail:

With special materials and crimped-on ring:
Bourdon tube pressure gauge RChgG 63 – 1

 
  • Case with crimped-on ring
  • Blow-out: screw with cross bore
  • Bottom connection or rm, BFr
  • Laminated safety glass
  • Sealant for window, connection piece
  • Case screws: PTFE, Viton or others



Pressure measurement in the automotive industry

In-line seals for pressure measurement on painting installations (AppBe_M_088)

for manufacturers of painting installations, motor vehicles and other surface coatings
Fields of application Pressure Measurement in the Automotive Industry Armaturenbau Manotherm
The automobile industry demands ever more specific measuring tasks. In painting installations, problems can occur in the processing of gloss paint, especially when changing batches. Even the spraying process method partially puts high demands on the pressure gauges.

The problem:

Gloss paint is a medium that should stick well on surfaces, but not in the painting installations. Deposits could lead to an intermixture of the products that is not desired. When changing the colour, e.g. from red to white, it has to be guaranteed that a pure white is produced and not pink. Therefore, the paint should run from the tank to the spray gun through crevice-free, smooth and easy to clean pipes. In ESTA painting, the colour particles are applied through electrical high tension.

Our solution:

We use in-line seals, which are suitable for measurements free of dead spaces. So-called pigs can completely remove the paint from the piping system. Thus, when changing the colour, the piping system can be cleaned more easily. Disturbing dead spaces are mostly avoided. These in-line seals are specifically matched to the special requirements of our customers, also when it comes to silicone.
In general, the versions are silicone-free. These instruments are entirely free of paint-wetting impairment substances.
Upon request, we can deliver voltage-proof in-line seals.

 In-line seal RDM 7680 Armaturenbau Manotherm

Our instrument in detail:

Measurements free of dead spaces: In-line seal RDM 7680
 
  • Can be complemented with bourdon tube pressure gauges and electric transmitters
  • Process connection: cutting ring fitting
  • Silicone-free version
  • Nominal pressure PN 250
  • Special version, e.g. with capillary line, upon request



Pressure measurement in the field of utility vehicles

Pressure gauges for inspections of air brake systems on trucks (AppBe_M_089)

for supervisory organisations (ÜO) that are approved for the execution of the main inspection
Fields of application Pressure Measurement in the Field of Utility Vehicles Armaturenbau Manotherm
According to the German Road Traffic Licensing Regulations (StVZO) art. 29, motor vehicles regularly have to be inspected for road safety. The general inspection (HU) has been performed in Germany since 1951. Meanwhile, also in the EU countries, in the USA and in other countries, similar regulations are applied.
As part of the general inspection, the braking action is tested. For this purpose, brake dynamometers, so-called roller brake test stands, are used.

The problem:

The inspection of brake systems on trucks* is not practicable on public roads. That is why the braking force dependent on the load conditions, is tested on a brake dynamometer.

The brake dynamometer is an apparatus that is used for testing of the brake system of motor vehicles.

In order to get exact measuring results or the brake system, pressure gauges are applied. It is possible to test the compressor unit on trucks, as well as the respective trailers, with pressure gauges.

The pressure gauge measures so called "set pressures" when the brake pedal is pressed.

The latest technical guidelines state that the difference of the braking action may only have a certain deviation from the maximum value. In this context, pressure gauges have to meet high demands.

In addition, the scale layout has to comply with guidelines as to ensure the accuracy requirements in the instruments.

* For trucks with a total weight of 7.5 t pneumatic brake systems are used.
 

Our solution:

Instruments for the use in supervisory organisations have to comply with certain laws and specifications.

The German calibration and measurement law states:
Pressure measuring instruments for the inspection of pressure in brake systems of vehicles that are braked by compressed air are subject to calibration obligation according to art. 2 paragraph 2


The calibration of our instruments takes place in-house by the Board of Weights and Measures.

The guidelines for application, quality and inspection of brake dynamometer require instruments with scales that are at least 150 mm (5.91") long and have high precision graduation. The brake pressure has to be indicated in bar or kPa (smallest subdivision 0.1 bar or 10 kPa).

Furthermore, the application of pressure gauges in horizontal position has prevailed in workshops. This is why our instruments consistently bear the mark for horizontal installation position.

We are able to produce our instruments in accordance with these criteria.

Our duplex pressure gauge has the advantage to indicate the pressures between the test connection on the pedal brake valve and the test connection on the wheel brake cylinder. The validator has the ability to receive and evaluate two values at a glance. The pressure generated by the driver is read. For comparison, the pressure that acts on the wheel brake cylinder is indicated.

Two single pressure gauges could be used alternatively. These are connected to the pedal brake valve and to the wheel brake cylinder. The values are indicated separately.

Other pneumatic pressures can also be tested in the same way. The pressure gauges can be connected, for example, to the air spring or to the air supply for brake balancing with a trailer.

Beyond the manufacturing of our pressure gauges, we also carry out repairs as well as the required repeat calibrations. The validity of the calibration is limited to 2 years by law. Afterwards, the instrument has to be tested and approved again.

Repeat calibrations also take place in-house by the Board of Weights and Measures.
 

Our advantages at a glance:

  • In-house calibration of the instruments
  • In-house repairs as well as repeat calibration
  • Smallest subdivision of the scale 0.1 bar or 10 kPa
  • Horizontal position of installation
  • Duplex pressure gauge for comparative pressure measurement
  • Case protection cap – protection of the instrument in rough workshop use (against impact)

Our instruments in detail:

Single pressure gauge: RB 100 – 1 Armaturenbau Manotherm
Single pressure gauge: RB 100 – 1
 
  • Accuracy class 1.0
  • NCS 100 (4")
  • Pressure Range 0 – 16 bar
  • Process connection M 16x1,5
  • Capillary line
  • Position of installation horizontal
  • Calibrated version
  • Case protection cap
Duplex pressure gauge: DR 100 – 1 pn Armaturenbau Manotherm
Duplex pressure gauge: DR 100 – 1 pn
 
  • Accuracy class 1.0
  • NCS 100 (4")
  • Pressure range 0 − 16 bar
  • Process connection M 16x1.5, 2 x parallel in parallel (pn)
  • 1 pointer black, 1 pointer red − red marking
  • High precision graduation
  • Horizontal position of installation
  • Calibrated version
  • Case protection cap (not illustrated)


Pressure measurement in engineering

Bourdon tube pressure gauges for water jet cutting and high pressure cleaning (AppBe_M_090)

for manufacturers and operators of water jet cutting systems, surface treatment companies
Fields of application Pressure Measurement in Engineering Armaturenbau Manotherm
The functional principle of water jet cutting and high pressure cleaning is basically the same. Water is pumped via a line to a nozzle, and then jetted under varyingly high pressure. Depending on the application, the requirements increase. The higher the pressure, the more complex the technology. In order to control pressures up to 4,000 bar, the pressure gauges also have to meet high demands.

The problem:

When formed parts made of metal or plastic are cut with high pressure water jets, the pressure gauges have to withstand high and dynamic pressures (up to 4,000 bar).
That is why the pressure gauge has to comply with special safety regulations, in order to ensure the safety of the user in case of danger.
We have accepted this challenge and developed an instrument that meets these requirements.
 

Our solution:

Our safety pressure gauge of the category S3 has a break-proof solid front between measuring system and dial. In addition, a blow-out back allows for full pressure relief in case of danger, in order to protect the user from injuries.
The instruments of this category are furthermore characterised by their high service life and reliability. The specialty about this pressure gauge are the high-quality processed parts. They are adapted for these process conditions so that you are provided with an instrument that meets your individual demands. An additional case filling serves the purpose of damping and reducing vibrations.
 

Bourdon tube pressure gauge RSChG 100 – 3 / RSChG 160 – 3 Armaturenbau Manotherm

Our instrument in detail:

Up to 4,000 bar:
Bourdon tube pressure gauge
RSChG 100 – 3 / RSChG 160 – 3

 
  • Accuracy class 1
  • Bayonet ring case, stainless steel
  • Case filling glycerin
  • Nominal case size 100, 160 mm (4", 6")
  • Process connections:
    • M 16x1.5
    • 9/16-20 UNF
    • Male thread tube 9/16-18 UNF
  • Window laminated safety glass
  • S3 safety pressure gauge with break-proof solid front and blow-out back



Pressure measurement in engineering

Diaphragm pressure gauges for the measurement of steam pressure in field kitchens (AppBe_M_091)

for manufacturers of field kitchens
Fields of application Pressure Measurement in Engineering field kitchen Armaturenbau Manotherm
A field kitchen is a mobile facility for the preparation of food. The field kitchen plays an important role in the military and also in emergency management, where big amounts of food have to be prepared to ensure the sustenance of the people.

The problem:

Generally, different types of cooking modules in the application of field kitchens exist. In our particular case, it is a cooking module with double jacket (inner and outer wall welded steam tight). This jacket is partially filled with water. The water vaporises due to the temperature rise and leads to an equal heating in the boiler. Thus, the food is also equally heated. The operating pressure lies at 1.5 to 2 bar (at 130 °C (266 °F) in the double jacket) and may not exceed 3 to 3.5 bar. The pressure in the boiler would get too high and raise the risk of destruction of the boiler, also entailing a higher risk of injury.
 

Our solution:

In order to save space, we apply a vertical diaphragm pressure gauge. A special thread connection according to DIN 2999 ensures that no steam can escape and the system remains tight.

The boiler is operational at 1.5 to 2 bar. As the pressure rises into the scale area marked in red (3 to 3.5 bar), a safety valve opens automatically, steam escapes and the pressure drops. Water has to be refilled accordingly, and the system has to be bleeded in order to use the instrument again. If vacuum occurs (-0.6 to 0 bar), the boiler also has to be checked and, if necessary, has to be filled and bleeded.
 

Diaphragm pressure gauge PsPKOe 63 – 3 Armaturenbau Manotherm

Our instrument in detail:

Measurement of steam pressure:
Diaphragm pressure gauge PsPKOe 63 – 3

 
  • Pressure range: -1 /+ 5 bar
  • (30" Hg vac. / 100 psi)
  • Operating pressure: 1.5 − 2 bar
  • Red (critical) range: 3 − 3.5 bar
  • Not operational: -0.6 − 0 bar (filling and bleeding necessary)
  • Special thread connection made of 316 L R ¾" conical DIN 2999 with extended connecting piece
  • Case filling oil for ambient temperatures of -31 °F / +284 °F



Temperature measurement in tanks on utility vehicles

Digital thermometer LILLY for the reliable temperature measurement of sensitive media (AppBe_M_092)

for manufacturers of utility vehicles
Fields of application Temperature measurement in tanks on utility vehicles Armaturenbau Manotherm
Road tankers and fuel tankers need to cover long distances on motorways or freeways. The content to be transported is highly sensitive to some extent (e.g. fuel, bitumen or dairy products). Phase transitions need to be avoided or the growth of harmful bacteria needs to be prevented. Furthermore, volumetric metering is necessary during filling or discharging the media. Thus, it is important to be able to read the temperature precisely and quickly.

The problem:

During transport of sensitive media over long distances, the temperature measuring instruments have to meet increased requirements due to vibration, environmental influences (dirt, rain, sunlight) and washing facilities.

Our solution:

A digital thermometer in rugged version, completely cast with PU (polyurethane). This version is vibration tested with an acceleration of 4 g.

Digital thermometer TDKCh 100

Our instrument in detail:

Whether firmly installed or dynamically on the road:
Digital thermometer TDSCh 100 or TDKCh 100

 
  • Measuring range: −99.9 °C to +550.0 °C, resolution 0.1 K
  • Accuracy:
    • Display: ±0.3 % FS ±1 digit
    • Sensor: Class B according to DIN 60 751
      (±0.3 K at 0 °C)
  • Display: 4-digit LC display, digit height 18 mm
  • Battery: within the scope of delivery, replaceable by the customer, battery life approx. 5 – 7 years, depending on application
  • Stem: stainless steel, operating pressure 25 bar
  • Case: with bayonet ring, stainless steel 1.4301
  • Stem position / process connection: various versions