Bourdon Tube Pressure Gauges

Accuracy (EN 837-1)
Class 1.0

Case
Bayonet ring, 1.4301 (304 stainless steel)
Case Protection Type (EN 60 529 / IEC 529)
IP 54
IP 65 for model RChG 100 and
model RChG 160 (pressure ranges > 2.5 bar and above)

Blow-out Device
Model RCh Blow-out plug in the back of the case, 1″ (Ø 25mm)

Model RChG 100 Blow-out plug in the back of the case, 11⁄2″ (Ø 40mm)

Model RChG 160 Blow-out device at the top of the case coverage

Case Ventilation
Model RChG 100 without ventilation, but with internal pressure
compensation by pressure equalizing membrane.
Model RChG 160 by blow-out device.

Case Filling
for model RChG: glycerine

Nominal Case Size
Model RCh: 100, 160, 250 (mm) (4″, 6″, 10″)
Model RChG: 100, 160 (mm) (4″, 6″)

Wetted Parts
Type –3: Connection: 1.4571 (316 stainless steel)
Bourdon tube: 1.4571 (316 stainless steel),
argon arc welding,
< 40 bar (600 psi) c-form
> 60 bar (800 psi) helical
1,600 bar (20,000 psi) NiFe-alloy, helical

Type –1: Connection: brass
Bourdon tube: < 40 bar (600 psi) bronze, c-form
soft-soldered > 60 bar (800 psi) 1.4571 (316 stain-
less steel), helical
silver brazed

Case Configuration
Connection: screwed
Position of the connection: bottom connection, optional lower back connection (r)
Mounting device: without, optional back fl ange for
surface mounting (Rh) / front fl ange
for panel mounting (Fr), see page 2

Pressure Ranges (EN 837-1)
0-0.6 bar (0-10 psi) to 0-1,600 bar (0-20,000 psi) for type –3
0-0.6 bar (0-10 psi) to 0-1,000 bar (0-15,000 psi) for type –1

Process Connection
G 1⁄2 B (1⁄2″ BSP)

Window
Laminated safety glass    for type –3
Instrument glass               for type –1

Movement
Stainless steel                    for type –3
Brass/German silver        for type –1

Dial
Aluminum, black figures, white background

Pointer
Aluminum, black

Safety Category according to EN 837-1
NCS 100 (4″): S1 pressure gauges with blow-out device

Ordering Information, Standard Pressure Ranges, Options:

• Other process connections upon request, e.g. high pressure
connection with external male thread
(0-60 bar / 0-800 psi and above)
• Other pressure ranges and/or special scales, e.g.
double scale bar/psi, coloured fields or areas, dial inscriptions,
negative scale etc.
• Version as refrigeration gauge with temperature scale (NCS 100)
• Stationary pointer or drag indicator with window made of poly-
carbonate or laminated safety glass upon request (not for NCS 250)
• Case parts 1.4404 (316 L stainless steel) upon request
• Increased case protection type, e. g. IP 65 without case filling,
upon request
• Other case fi llings upon request
• Model RChG 100–3 and 160–3
for ambient temperatures down to -40 °C (-40 °F).
Our recommendation for ambient temperatures below
-20 °C (-4 °F); pressure gauges with crimped-on ring case
models RChg resp. RChgG
• Versions for medium temperatures up to 300 °C (572 °F),
but without case filling upon request (not NCS 250)
• Position of connection radial at 3 o ́clock, 9 o ́clock or 12 o ́clock
(others upon request) or other than vertical installation (90°):
– for models without case filling and for filled models with
pressure equalizing membrane;
– for filled models without pressure equalizing membrane
upon request
• GOST-version for Russia, Ukraine, Kazakhstan
• Sour gas-resistant version according to NACE

Accessory:

Chemical seals: see catalogue-heading 7
Electrical: limit switch contact assembly DS 1291 and

catalogue-heading 9.1
Other accessory: see catalogue-heading 11

Case Configurations, Code Letters, Dimensional Data and Weights, Blow-out Device

Ordering Information with Standard Pressure Ranges, Options

Further Options regarding Ordering Information