Measurement Instrumentation
57
Bellows Gauges
for Differential Pressure,
Flow and Level
Model
1020 1123 1124 1126 1224 1226 1226X 1126P-2
Dial Size
No Dial 3” 4½” 6” 4½” 6” 6” 6”
Housing
End Housing Center Plate Static Working Pressure Process Connections
Brass Brass 500 or 1000 PSI ¼” NPT
316 SS 316 SS or Brass (500 SWP Only) 1500, 3000 or 6000PSI ¼” & ½” NPT
Monel 316 SS 1500, 3000 or 6000PSI ¼” & ½” NPT
Bellows
Beryllium Copper (30” w.c. Minimum—60 PSID Maximum)
316 Stainless Steel (50” w.c. Minimum—500 PSID Maximum)
Monel (50” w.c. Minimum—60 PSID Maximum)
Mounting
Flush Panel using indicator case for mounting
(Except 1126P)
Wall or
3
/
4
” NPT using universal mounting bracket
Pipe Saddle or Wall using “H” mounting Bracket and 2” U-Bolts
Features
Special scales and ranges available Optional bellows fill fluid
Simple zero, span and linearity adjustment Additional relay options available for 1220 Series
Temperature compensation for varying ambients 270” pointer travel; red set pointer
Break-resistant acrylic viewing window Valves and Piping
NEMA 4, Die-cast aluminum case with gasketed
cover
Special cleaning for oxygen service
Low friction “O” ring sealed shaft output Option for meeting NACE MR-01-75 requirements
Optional anti-parallax mirror dial Terminal Strip
CE approval for 1120 and 1220 Series (option) Built-in pulsation dampening (field adjustable)
CSA approved 1226 Models
Features
1020 & 1120 Accuracy
30” w.c. range 1.50% FS
50” w.c. thru 500 PSID range 0.75% FS
Option: 100” w.c. thru 50 PSID range 0.50% FS
1220 Accuracy
Before switch activation 0.75% FS
At switch activation point 2.00% FS
After switch activation 1.50% FS
Zero Elevation
100% of range (150 PSID maximum)
Suppression
15% of range with 270° pointer travel
Operating Temperature
-60°F to +200°F
Full Scale Displacement
30” w.c. thru 130” w.c. range .19 Cu. In.
135” w.c. thru 60 PSID range .12 Cu. In.
75 PSID thru 500 PSID range .06 Cu. In.
1220 Switch Type
Snap action SPDT
1220 Switch Setting Accuracy
1.00% FS
1220 Dead Band
1 switch (nominal) 7% FS
2 switch (nominal) 10% FS
1220 Switch Setting
Increasing -10 to 100% of differential or 10” of water
whichever is greater
Decreasing - 5% or 5” of water whichever is greater
Between set points -15% of FS minimum
1220 Switch Rating
5 amps at 125V or 250V AC
3 amps inductive or 5 amps resistive at 30VDC
Mounting Dimensions
Model 1020 Request File No. 1020:420
Model 1123 Request File No. 1123:420
Model 1124 Request File No. 1124:420
Model 1126 Request File No. 1126:420
Model 1224 Request File No. 1224:420
Model 1226 Request File No. 1226:420
Model 1226X-1 Request File No. 1226X-1:420
Model 1226X-2 Request File No. 1226X-2:420
Specifications
Ordering
Information
To order any one of Meriam’s
Bellows Gauges, custom-
made to your specifications,
please contact your Meriam
sales representatives with
the following information:
• Model Number
• Housing Material
• Safe Working Pressure
• Bellows Material
• Differential Range
• Type of Scale
(Linear or Sq. Rt.)
• Type of Mounting
(4 pages)
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