For example a 1 1/2″ steel case gauge with 1/8″ NPT lower mount with 100 psi would be ordered as follows:
P M B 15 8 E LM
Type ---------------+ | | | | +---+ +-------Mounting
P=Pressure | | | +----+ | CB=Center Back
C=Compound | | Diameter | | LM=Lower/Bottom
V=Vacuum | | 15=1 1/2" | | FF=Front Flange
T=Temperature | | 20=2" | | (3 Hole)
W=Water Test | | 25=2 1/2" | | PM=Panel Mount
Case --------------------+ | 35=3 1/2" | | (U Clamp)
A=Steel, Ammonia | 40=4" | | LB=Lower Back
D=Steel, Diaphragm | 45=4 1/2" | |
G=Stainless, Filled | | +--- Range (PSI/kPa/Bar)
| Connection A=Vacuum
M=Steel, Dry | 8=1/8" B=15 I=400 Q=5000
N=Plastic,Dry | 4=1/4" C=30 K=600 S=10000
S=Stainless, Dry | 2=1/2" D=60 L=800 T=15000
Internals & Socket ----------+ E=100 M=1000 U=4000
B=Brass F=160 N=1500 V=6000
I=Iron or Steel G=200 O=2000
S=Stainless Steel H=300 P=3000