Bourdon tube pressure gauge with switch

Bourdon tube pressure gauge with switch contacts model PGS23 WIKA

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 switchGAUGE 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.

As switch contacts magnetic snap-action contacts, reed switches, inductive contacts – for requirements to ATEX – or electronic contacts for triggering a PLC are available.

Applications

Control and regulation of industrial processes
Monitoring of plants and switching of electric circuits
For gaseous and liquid aggressive media that are not highly viscous or crystallising, also in aggressive ambience
Process industry: Chemical, petrochemical, power plants, mining, on- and offshore, environmental technology, machine building and general plant construction

Technical Feature

Nominal size in mm

Accuracy class

Scale Ranges

0 … 0.6 to 0 … 1,600 bar or all other equivalent vacuum or combined pressure and vacuum 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 unfilled instruments or instruments with silicone oil filling

Medium:

+200 °C maximum with unfilled instruments
+100 °C maximum with filled instruments

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 (radial) or lower back mount
G ½ B (male), SW 22

Pressure element

Stainless steel 316L
C-type or helical type

Movement

Stainless steel

Dial

Aluminium, white, black lettering

Pointer

Instrument pointer: Aluminium, black
Set pointer: Red

Case

Stainless steel

Window

Laminated safety glass

Ring

Bayonet ring, stainless steel

Electrical connection

Cable terminal box

Ingress protection per IEC/EN 60529

IP54

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 the 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 the 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
NS 100: Maximum two change-over contacts per measuring instrument
NS 160: Maximum one changeover contact per measuring instrument (switching voltages AC < 50 V and DC < 75 V, switch contact not adjustable from outside)

Switching function

The switching function of the switch is indicated by index 1, 2 or 3.

Model 8xx.1: Normally open (clockwise pointer motion)
Model 8xx.2: Normally closed (clockwise pointer motion)
Models 821.3 and 851.3: Change-over; one contact breaks and one contact makes simultaneously when the pointer reaches set point