MERIAM
Meriam brand products, a Western Enterprises company, is recognized as a leading supplier of instrumentation & test and calibration equipment. We use the latest advances in technology and design while delivering superior performance with calibrators and digital manometers. We are committed to providing quality products with an impeccable support experience.
A trusted leader in measurement and calibration solutions for over 100 years.
Bellows Gauges for Differential Pressure, Flow and Level
The Meriam Model 1120 Differential Pressure Unit is a proven and reliable sensing element used in all Meriam Bellows Gauges. It is available in ranges as low as 0-30” w.c. or as high as 0-500 PSI. The light weight and compact differential pressure unit incorporates a rupture-proof and leak-proof bellows plus other features that ensure ruggedness and reliability. This basic unit is
suitable for activating indicators, recorders, transmitters, switches, and controllers and is available as a separate assembly for that purpose.
1120 SERIES DIFFERENTIAL PRESSURE UNITS
Indicator models 1123, 1124, and 1126 feature 3-inch, 4½-inch, and 6-inch dial sizes, respectively. These models can be supplied with a wide range of scales for measuring differential pressure, flow, or level. The 1120 Series is widely utilized across various industries, including industrial process plants, power generation facilities, pollution control systems, and the cryogenic gas industry, where reliable and accurate pressure measurement is essential.
1220 SERIES INDICATING SWITCHES
Precise Indication with Reliable ON-Off Control or Alarm
The Series 1220 Differential Pressure Indicating Switches combine accurate visual indication with dependable switching functionality for on-off control or alarm activation. These units are ideal for monitoring flow, liquid level, or other critical process variables.
Each switch is equipped with one or two SPDT (Single-Pole Double-Throw) switches, with easily adjustable actuation setpoints across most of the instrument’s range. The 270° calibrated pointer travel ensures excellent resolution for both differential pressure indication and switch actuation.
Dials are available with:
- Linear scales for differential pressure
- Square root scales for flow measurement
- Custom scales for liquid level or user-specific requirements
Common Applications:
- Power Generation Facilities
- Compressor Stations
- Cryogenic Storage and Distribution Systems
Robust and versatile, the Series 1220 is a trusted solution for critical control and monitoring tasks in demanding industrial environments.
1226X EXPLOSION-PROOF SWITCH
The Meriam 1226X Explosion-Proof Indicating Switch is CSA and UL listed, fully compliant with NEC requirements for Class I, Division I, Group D hazardous environments. These atmospheres include flammable gases and vapors such as gasoline, hexane, naphtha, benzine, butane, propane, alcohol, acetone, benzol, lacquer solvents, and natural gas.
Its explosion-proof housing is constructed from a durable, lightweight aluminum alloy that is both corrosion-resistant and non-sparking. A large glass window offers clear, full visibility of the 6-inch indicator dial. Mounting options include front-of-board, panel, or pipe installation to suit a variety of applications.
MERI-CAL
The Meri-Cal is a portable digital manometer /calibrator for pressure and differential pressure measurement. It features high accuracy and rugged design that brings laboratory test and calibration capability to the field Meri-Cal’s display simultaneously indicates pressure (or differential pressure) and electronic transducer/transmitter output in any of eight key selectable engineering units. Meri-Cal continues to provide the most cost effective and useful method of precise measurements.
1126P-2 PORTABLE INDICATOR
The 1126P-2 is designed for portable applications. Typical examples are periodic measurements of the pressure drop across filters, balancing of flow rates in heating and cooling systems and checking of back flow prevention devices. Meriam’s 1126P-2 consists of an 1126 D/P Indicator with 3-valve manifold and piping, 2 hoses and quick disconnects. Each instrument system is assembled as a complete package with all the accessories mounted in a rugged, light weight case. When used as a flow measuring device, the instrument normally comes with a 0-100% square root scale. With all flow elements designed for the same differential, multiplying the scale reading by the primary element’s full flow design value gives readings directly in flow units. Scales in flow units, inches of H20, PSI and metric units are also available.
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
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
Specifications
