ĐỒNG HỒ ĐO ÁP SUẤT WIKA 230.25 with 851 Switch

Design
ASME B40.100
Size
2” (50 mm)
Accuracy Class
Gauge: ± 2/1/2% of span (ASME B40.100 Grade A)
Switch: ± 5% of span at Switch Point
Ranges
Vacuum / compound to 30”Hg/0/300 psi
Pressure from 60 psi up to 5000 psi or other equivalent units of pressure or vacuum
60 psi minimum span
Working Pressure

Steady:         3/4 full-scale value

Fluctuating:   2/3 full-scale value

Short time:    full-scale value

Operating Temperature
Ambient: -40°F to +140°F (-40°C to +60°C)
Medium: +212°F (+100°C) maximum
Temperature Error
Additional error when temperature changes from reference temperature of 68°F (20°C) ±0.4% for every 18°F (10°C) rising or falling. Percentage of span.
Weather Protection
Weather resistant (NEMA 3 / IP 54)
Pressure Connection
Material: Face-seal nut, 316 SS, UNS S20161
Face-seal gland 316L SS VOD or VIM/VAR
Position: Lower mount (LM)
Center back mount (CBM)
Type of Connection: Face-seal fixed male, swivel male or female
Wetted Surface Finish: Ra < 0.25µm (Ra < 10µinch)
Bourdon Tube
Material: 316L SS
30”Hg (vac) to 5000 psi, C-type
Helium leak tested 1 x 10-9 scc/sec (inboard)
Socket
Material: 316L VIM/VAR electropolished
Ra < 0.25µm (Ra < 10µinch) - internal
Movement
Stainless steel

Dial
White aluminum with stop pin and black lettering
Pointer
Black aluminum
Case
304 SS, electropolished
Window
Polycarbonate: twist-lock
Alarm contact
Reed contact Model 851.XX; The switching function is identified by the index ‘3’. 851.3 = One SPDT contact. 851.33 = Two SPDT contacts
Setting the switching point In order to adjust the switching point, the gauge should be
disconnected from the monitoring device and the window unscrewed.
The switches are set via the mark pointer(s) on the dial‘s circumference. The set value of the switching point is adjustable up to 80 % of the scale range, 15% from low end and 5% from high end of scale.
Electrical load

Max. switching voltage: 24 VDC / VAC

Max. load: 10 W

Max. current: 0.5 A

Electrical connection with cable gland M8 x 1.25, cable output 3 m long (10 ’), conductor cross section 0.14 mm2 (26 AWG), flying leads, the terminal assignment is stated on the pressure gauge’s connection plate