APPENDIX
©2014 Kraus Global Ltd.
Retail CNG Dispenser Manual
Appendix-3
Magnehelic pressure gauge
The Dwyer® 2000 Series Pressure Gauge is used to quickly indicate
low-air or non-corrosive gas pressures—whether positive, negative
or differential—at a high-level of accuracy. The 2000 series is shock,
vibration, and overpressure resistant, and operates without
manometer fluid, thereby avoiding unnecessary fluid maintenance
and any toxicity and leveling problems.
Specifications
Service
Air and non-combustible, compatible gases
Housing
Die cast aluminum case and bezel, with acrylic
cover. Exterior finish coated gray to withstand 168
hour salt spray corrosion test
Accuracy
±2% of full scale throughout range at 70
°
F (21.1
°
C)
Pressure limits
-
20” Hg to 15 psig
† ; MP: 35 psig; HP: 80 psig
Overpressure
Relief plug opens at approx. 25 psig (1.72bar). Refer
to manufacturer for overpressure protection note.
Temperature limits
20 to 140
°
F ; -6.67 to 60
°
C
Size
4” (101.6mm) diameter dial face
Weight (approx.)
3.25 lb (1.5 kg)
Approvals
CE, UL, CSA, FM
Pressure switch
The Dwyer® 1950 Series Pressure Switch operates as the trigger
that initiates power to all dispenser-electronics. The pressure switch
is located in the lower cabinet and is programmed to detect a specific
level of air pressure, which upon detection, delivers a signal to
initiate and maintain power to all dispenser-electronics.
Should the air pressure fall below the threshold, the signal is broken
and power to all dispenser-electronics is terminated.
Specifications
Service
Air and non-combustible, compatible gases
Temperature limits
-40 to 140
°
F (-40 to 60
°
C)
Enclosure rating
NEMA 3 (IP54), NEMA 7 & 9
Switch type
Single-pole double-throw (SPDT)
Electrical rating
15 A@, 125, 250, 480 VAC, 60 Hz. Resistive 1/8 HP
@ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz.
Electrical connections
3 screw type, common, normally open and normally
closed
Process connections
1/8” female NPT
Weight (approx.)
3.25 lb (1.5 kg)
Approvals
CE, UL, CSA, FM
