Bellows gauge

NegotiableUpdate on 06/13

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Nature of the Manufacturer: Producers

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Place of Origin

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Overview

The Meriam 1120 differential pressure device is a mature and reliable sensing element that can be used for all Meriam bellows gauges. Its usage range can be as low as 0-30 "W.C. or as high as 0-500 PSI. This component features a lightweight, compact differential pressure device and anti rupture and leak proof corrugated tube, ensuring its durability and reliability. This basic device can be used as a standalone component to activate indicators, recorders, transmitters, switches, and controllers.

Product Details

Bellows gauge

bellowsgaugesdatasheet

Used for differential pressure, flow rate, and liquid level

1120 includes high and low pressure corrugated pipes connected to each side of the center plate. The corrugated tube is enclosed in the end shell, which is then bolted to the center plate. The interior of the corrugated tube and center plate is filled with clean, low freezing point, and non corrosive filling fluid. If a differential pressure is applied, the filling liquid moves between the corrugated pipes through a field adjustable attenuation valve in the center plate. When measuring pulsating differential pressure, no other external damping device is required. In addition, Meriam 1120 adopts a special design that completely separates the process fluid from the center plate.

When a differential pressure is applied on the high and low pressure connections, the high-pressure bellows come into contact, forcing the fluid to pass through the center plate and enter the expanded low-pressure bellows. Through temperature compensation linkage, the linear motion of the low-pressure corrugated tube generated is transformed into a 6 ° rotational motion of the output shaft. Through the two fluid shut-off valves on this linkage, over range protection is provided to achieve the pressure level of the casing. The output shaft is part of a low friction "O" ring sealed shaft and bearing assembly, which can withstand rotational motion in the external area of the bellows device and inside the instrument housing.

	1120 series indicator Indicator models 1123, 1124, and 1126 have dials of 3 ", 418", and 6 ", respectively. Multiple scales are available for differential pressure, flow rate, and liquid level. The 1120 series is widely used in industrial refineries, power plants, pollution prevention and control facilities, and low-temperature gas industries.
	1220 series indicator switch The 1220 series differential pressure indicator switch can be used for switch control or alarm. They also indicate flow rate, liquid level, or other process variables. These devices are equipped with one or two single pole double throw switches, which can easily adjust the trigger set point within most of the instrument range. The calibration stroke of the pointer is 270 °, which can provide good differential pressure display and switching resolution. The dial can provide differential pressure linear scale, flow square root scale, or customized liquid level scale. The 1220 series switches are widely used in power plants, compressors, and low-temperature applications
	1226X explosion-proof switch Meriam's 1226X explosion-proof indicator switch is included in CSA and U.L, and meets N.E.C's Class I, Zone I, and Group D hazardous environment requirements. Class I and D atmospheres include gasoline, hexane, naphtha, gasoline, butane, propane, ethanol, acetone, benzene, paint, solvent vapor, and natural gas. The explosion-proof casing is made of high-strength, lightweight, rust resistant, and spark free aluminum alloy. The large glass window can fully display the 6 "indicator. Can provide front end for board, panel or pipe installation.
	1126P-2 portable indicator 1126P-2 is designed for portable applications. A typical application example is to periodically measure the pressure drop of the entire filter, balance the flow rate in heating and cooling systems, and check anti backflow devices. Meriam's 1126P-2 includes an 1126 D/P indicator with a 3-valve manifold and piping, 2 hoses, and a quick disconnect device. Each instrument system is assembled as a complete package, and all accessories are installed in a sturdy, lightweight housing. When used as a flow measurement device, the instrument is typically equipped with a 0-100% square root scale. By designing all flow elements for the same difference and multiplying the scale reading by the full flow design value of the basic element, the reading of the flow unit can be directly obtained. It is also possible to obtain scales in flow units, inches, H20, PSI, and metric units.

1020&1120 accuracy
30 "W.C. range	1.50% FS
50 "W.C. to 500 PSID range	.75% FS
Options: 100 "W.C. to 50 PSID range	.50% FS
1220 precision
Before starting the switch	.75% FS
When the switch is activated	2.00% FS
After the switch is activated	1.50% FS

Zero elevation
100% range (maximum 150 PSID)

suppression
15% of the range of 270 ° pointer travel

operation temperature
-60℉ to+200℉
Full range displacement
Range from 30 "W.C. to 130 W.C	.19 Cu. In
135 "W.C. to 60 PSID range	.12 Cu. In
Range: 75 PSID to 500 PSID	.06 Cu. In
1220 switch type
Rapid SPDT
1220 switch setting accuracy
1.00% FS
1220 Dead Zone
1 switch (nominal value) 7% FS
2 switches (nominal value) 10% FS

1220 switch setting
10% to 100% increase in differential pressure, or 10 "water column, whichever is greater

5% differential pressure or 5 "water column, whichever is greater
Between set points - minimum 15% of FS
1220 switch level
5 amperes at 125V or 250V AC
At 30VDC, 3-amp inductive or 5-amp resistive
Installation size
(Model 1020)	Application Document Number 1020:420
(Model 1123)	Application Document Number 1123:420
(Model 1124)	Application Document Number 1124:420
(Model 1126)	Application Document Number 1126:420
(Model 1224)	Application Document Number 1224:420
(Model 1226)	Application Document Number 1226:420
Model 1226X-1	Application Document Number 1226X-1:420
Model 1226X-2	Application Document Number 1226X-2:420

ordering information

To order a Meriam bellows gauge according to your requirements, please provide the following information:

model

Shell material

safe working pressure

Corrugated pipe material

Differential range

Scale type

(Linear or square root).

Installation type

standard
model	1020	1123	1124	1126	1224	1226	1226X	1126P-2
Dial size	No dial	3”	4½”	6”	4½”	6”	6”	6”
casing	End shell	Central plate			Static work pressure		System connectors
	brass	brass			500 or 1000 PSI		¼ NPT
	316 SS	316 stainless steel or brass (only 500 SWP)			1500, 3000, or 6000 PSI		¼”&½” NPT
	Monel	316 SS			1500, 3000, or 6000 PSI		¼”&½” NPT
corrugated tube	Beryllium copper (minimum 30 "W.C. - maximum 60 PSID) 316 stainless steel (50 "W.C. - maximum 500 PSID) Monel alloy (50 "W.C. - maximum 60 PSID)
install	Rinse plate, used for indicator housing installation
(Except for 1126P)	Use universal mounting brackets for walls or 3/4 "NPT
	Pipe saddles or walls using "H" brackets and 2 "U-bolts
Product Features	Available special scales and ranges Simple zero point, range, and linear adjustment Temperature compensation for different environmental temperatures Anti fracture acrylic window NEMA 4， Die cast aluminum alloy shell with padded cover Low friction "O" ring sealed shaft output, optional anti parallax mirror dial, CE certified 1120 and 1220 series (optional) 1226 model				Optional corrugated tube filling fluid Can be used for selecting other relays with 1220 series and 270 "pointer travel; Red setting pointer, valve and pipeline Special cleaning for oxygen services Select terminal blocks that meet the requirements of NACE MR-01-75 Built in pulse attenuator (adjustable on-site)

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