Application
The gauges offer several ranges for use with various type of refrigerants. These gauges can be permanently mounted in cooling systems or used on portable manifolds.
Size
2” , 2.5” , 3.5”
Accuracy
±2.5% of Span (Grade B ANSI B40.1)
Ranges
30"Hg - 0 - 120psi retarded to 350 psi
0-500 psi;0-10bar,0-30bar
Or other equivalent units of pressure or vacuum range.
Operating Temperature
Ambient:  -4℉ to 140℉ (-20℃ to 60℃)

Connection
Material: Copper alloy
Lower mount (LM)
1/8"NPT
Bourdon Tube
Material: Copper alloy
C-type
Movement
Copper Alloy
Dial
Gavalum steel, white backgroound with black markings. Refrigerant temperature scales.
Pointer
Aluminum, with an adjusting screw for resetting
Case
311A - ABS, low pressure in Blue & high pressure in Red
311B - Drawn steel case, low pressure in Blue & high pressure in Red
312 - Drawn steel case with U_Clamp & Front Flange available
Window
Twist-On threaded, polycarbonate

Specification Chart1

Specification Chart2