Description
Bourdon tube pressure gauge with switch contacts model PGS23
Wherever the process pressure has to be indicated locally, and, at the same time, circuits are to be made or broken, the model PGS23.1×0 switch GAUGE can be used.
Switch contacts (electrical alarm contacts) make or break an electric control circuit dependent upon the position of the instrument pointer.
The switch contacts are adjustable over the full extent of the scale range (see DIN 16085), and are mounted predominantly below the dial, though also partly on top of the dial.
The instrument pointer (actual value pointer) moves freely across the entire scale range, independent of the setting.
The set pointer can be adjusted using a removable adjustment key in the window.
Switch contacts consisting of several contacts can also be set to a single set point. Contact actuation is made when the actual value pointer travels beyond or below the desired set point.
The pressure gauge is manufactured in accordance with DIN 16085 and fulfils all requirements of the relevant standards (EN 837-1) and regulations for the on-site display of the working pressure of pressure vessels.
Nominal size in mm
- 100, 160
Accuracy class
1.0
Scale ranges
- 0 … 0.6 to 0 … 1,600 bar
or all other equivalent vacuum or combined pressure andvacuum ranges
Pressure limitation
Steady: Full scale value
Fluctuating: 0.9 x full scale value
Short time: 1.3 x full scale value
Permissible temperature
- Ambient: -20 … +60 °C for gauges without liquid filling and gauges with silicone oil filling
- Medium: +200 °C maximum without liquid filling +100 °C maximum with liquid filling
Temperature effect
When the temperature of the measuring system deviates from the reference temperature (+20 °C): max. ±0.4 % / 10 K of full scale value
Process connection
Stainless steel 316L
Lower mount (LM) or lower back mount (LBM)
G ½ B (male), 22 mm flats
Movement
- Stainless steel
Dial
Aluminium, white, black lettering
Pointer
Instrument pointer: Aluminium, black
Set pointer: Red
Case
Stainless steel
Standard version (S1): With blow-out device in case back (per EN 837) or Safety version (S3): With solid baffle wall (Solidfront) and blow-out back (per EN 837), hermetically sealed, with internal pressure compensation
Window
Laminated safety glass
Switch contacts
Magnetic snap-action contact model 821
- No control unit and no power supply required
- Direct switching up to 250 V, 1 A
- Up to 4 switch contacts per measuring instrument
Inductive contact model 831
- Long service life due to non-contact sensor
- Additional control unit required (model 904.xx)
- With corresponding control unit suitable for use in zone 1 / 21 (2 GD) hazardous areas
- Low influence on the indication accuracy
- Fail-safe switching at high switching frequency
- Insensitive to corrosion
- Up to 3 switch contacts per measuring instrument
Electronic contact model 830 E
- For direct triggering of a programmable logic controller (PLC)
- 2-wire system (option: 3-wire system)
- Long service life due to non-contact sensor
- Low influence on the indication accuracy
- Fail-safe switching at high switching frequency
- Insensitive to corrosion
- Up to 3 switch contacts per measuring instrument
Reed switch model 851
- No control unit and no power supply required
- Direct switching up to 250 V, 1 A
- Also suitable for direct triggering of a programmable logic controller (PLC)
- Free from wear as without contact
- Up to two change-over contacts per measuring instrument Switching function
The switching function of the switch is indicated by index 1, 2 or 3.
- 8xx.1: Normally open (clockwise pointer motion)
- 8xx.2: Normally closed (clockwise pointer motion)
- 821.3 and 851.3: Change over; one contact
breaks and one contact makes simultaneously when pointer reaches set point
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