Main Facts
| Dimension | PN | Temperature range | Material |
|---|
G 1/4 - G 3/8 | Full scale value for temporary load | -20 °C to +60 °C | Plastic |
Range of Application
For measuring the pressure of liquefied or gaseous non-aggressive media, primarily water, air and steam.
Program text
UGC.31 Pressure gauge
Pipe-mounted, with analogue display of instantaneous value. Pressure gauges AT 4258 of Bourdon tube type. Class 2.5, husdiameter 62 mm, graded 0 -.... bar / Pascal.
Quality Assurance
PED, AFS 1999:4
Material Specification
| | AT 4253 | AT 4257 | AT 4258 |
|---|
| 1 | Bourdon tube | copper alloy | copper alloy | copper alloy |
| 2 | Hus | black plastic ABS | black plastic ABS | black plastic ABS |
| 3 | Mätverk | copper alloy | platinum brass | copper alloy |
| 4 | Glas | acrylic glass | acrylic glass | acrylic glass |
| Parts in contact with media is made of copper alloy | | | | |
Dimensions
| AT 4258 |
|---|
| A | - |
| B | 62 |
| C | G 1/4 |
| D | 29 (with connection pin 47) |
| Measurment 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 measuring element into a movement/indication value on the dial.
Technical Information
| AT 4258 |
|---|
| Media temperature | -20°C to +60°C |
| Ambient temperature | -20°C to +60°C |
| Accuracy class | 2,5% |
| Effect of temperature | 0,4%/10°C (over and under 20°C) |
| IP class | 54 |
| Max. working pressure | 75% of the scale value at resting load. 66% 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 gauges sets includning control pressure gauge valve, water trap pipe and and pressure gauge valve, please see our AT 1800-1806 product sheet. The pressure gauges are also available in damping fluid-filled, in stainless steel and with non-standard gradings upon request.
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 trap 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, class and grading.
How to order
| Example: AT 4258-8-2,5 | | | |
| AT 4258 | - | 10 | 2,5 |
|---|
| Article no. | Execution | Connection | Grading |
| AT 4258=bodydiam. 62 mm, back tap | -=standard | -8 | |
| D=damping fluid-filled | | |
| U=decompression | | |
