Main facts
| Dimension | PN | Temperature range | Material |
|---|
G 3/8 G 1/2 | Full scale value for temporary load | -40°C to +80°C | Stainless |
Range of Application
For measuring the pressure of liquefied or gaseous non-aggressive media, primarily water, air or steam. For pressure measurement of liquid or gaseous, aggressive media are both pressure gauges AT 4256 and AT 4259 in industrial design and is then called AT4256R and AT 4259R.
AMA-text
UGC.31 Pressure Gauge
Pipe-mounted, with analogue display of instantaneous value. Pressure Gauge AT 4256 of Bourdon tube type. Class 1.0, housing diameter 160 mm, graded 0 -.... bar.
Quality Assurance
PED, AFS 1994:4
Material Specification
| | AT 4256 |
|---|
| 2 | Body | chromium nickelsteel with bayonet unruffled capsule |
| 3 | Measuring element | Platinum brass |
| 4 | Glass | instrument glass |
| Parts in toutch with media made by copper alloy | | |
Material Specification Industrial Performance
| AT 4256R |
|---|
| Body | Chromium nickelsteel with bayonet unruffled capsule |
| Mesaurament element | Stainless steel |
| Glass | Laminated protection glass |
| Parts in contact with media | Stainless steel 1.4404 |
Dimensions
| AT 4256-15 /AT4256-10 |
|---|
| Standard Industrial design |
|---|
| A | 118 |
| B | 160 |
| C | G 1/2 / G 3/8 |
| D | 50 |
| Measurement in mm. | |
Function and Design
The pressure gauge is a bourdon tube type, which involves a circle-formed tube spring with an oval cross-section. The system pressure internally affects the Bourdon tube so that it, at a certain pressure tends to straighten out. The free end of the Bourdon tube moves proportionally with the internal pressure. This movement is then converted by the gauging element into a movement/indication value on the dial.
Technical Information
| AT 4256 | AT 4256R |
|---|
| Media temperature | -40°C to +80°C | -40°C to +200°C |
| Ambient temperature | -40°C to +60°C | -40°C to +60°C |
| Accuracy class | 1% | 1% |
| Effect of temperature | 0,4%/10°C | 0,4%/10°C |
| IP class | 54 | 65 |
| Max. working pressure | The hole scale value at resting load. 90% of the scale value at fluctuating loads. | The hole scale value at resting load. 90% of the scale value at fluctuating loads. |
Dimensioning
The scale range should be selected in accordance to the constant pressure that not should exceed 2/3 of the scale range.
Accesories and Options
For complete pressure gauge sets including control pressure gauge valve, water trap pipe and pressure gauge valve, please see our AT 1800-1806 product sheet.
The pressure gauges are also available in stainless steel, damping fluid-filled, with a connection tap on the back and with non-standard gradings.
Installation
The pressure gauges are to be mounted so that they are both easy to read and protected against vibrations, heat, cold and high air humidity. For high fluid temperatures, a water worm pipe should be used. For pressure variations and vibrations, a damping fluid-filled pressure gauge should be used.
Marking
The products are marked with Armatec (standard products), class and grading.
How to order
| Exempel: AT 4259-10-6 | | | | |
| AT 4259 | - | 10 | 6 |
|---|
| Article no. | Performance | DN | Grading |
| AT 4256=bodydiam. 160 mm | - =standard | -15 | |
| AT 4259=bodydiam. 100 mm | D=damping fluid filled | | |
| R=rust-resistant model | | |
| U=decompression | | |
