w w w . m k s i n s t . c o m

Pressure & Vacuum Measurement
SolutionsType 220DD
Baratron® General Purpose Differential 		
Capacitance Manometer
The MKS Type 220DD Baratron® General Purpose Differential Manometer offers a reliable,
accurate, inexpensive solution to measuring low differential pressures.
Operating on the variable capacitance technique, the 220DD all-metal sensor contains
a tensioned metal diaphragm, one side of which is exposed to the gas whose pressure
is to be measured (Px side). The other side (reference, or Pr, side) is adjacent to anelectrode assembly which is terminated in another like port. The diaphragm deflects withchanging differential pressure, causing a capacitance change between the diaphragmand the adjacent electrode assembly. The capacitance change generates an AC voltage
which is amplified, demodulated, and converted into a high level DC voltage output, linearwith pressure, and calibrated against a pressure standard. The Type 220DD sensor istemperature controlled at 45°C for enhanced zero and span stability.
All components are housed in a rugged, NEMA 1 enclosure for protection when used inharsh environments. Two outputs, 0-10 VDC and 4-20 mA, are provided for interfacing with
common process controllers.

Features & Benefits• All-metal sensor eliminates handlingproblems associated with glass, mercury, 		and liquid gauges• Useable resolution of 1 part in 10,000— minimizes the number of capacitance 				 manometers required to cover a wide 				 range of pressures• NEMA 1 enclosure provides sensor
protection in harsh operating 			environments• Sensor is temperature controlled at 45°C
for stable performance• Simultaneous 0 to 10 VDC and 4 to 20mAoutputs interface with common process 		
control systems

Specifications andOrdering Information
Full Scale Ranges
1, 10, 20, 100, 1000, 5000, 10000, 15000, 20000, 25000 mmHg 						(other engineering units available on request)
Resolution
0.01% of F.S.
Accuracy±0.15% of Rdg. (± temperature coefficients)
Temperature Coefficients											
Zero0.008% of F.S./°C for 1 Torr										0.005% of F.S./°C > 1 Torr 							
Span0.02% of Rdg./°C
Ambient Operating Temperature
5° to 40°C
Sensor Operating Temperature
Temperature controlled at 45°C
Maximum Overpressure
120% of F.S. or 20 psi (140 kPa), whichever is greater		(For Full Scale ranges less than 1000 mmHg, the following restrictions apply: if high pressure		is on the Px side of the sensor, the maximum differential overpressure allowable is 120% of		F.S. or 20 psi, whichever is greater; if high pressure is on the Pr side of the sensor, the 				maximum differential overpressure allowable is 120% of F.S. Consult factory for higher Pr		
overpressure protection.)
Maximum Line Pressure
40 psig (275 kPa)
Materials Exposed to Gases											Inconel®										Px sidePr sideInconel, Ceramic, Palladium, Stainless Steel, GlassVolume
Px side: 7.0 cc
Pr side: 19.0 cc
Fittings											½'' OD (12.7 mm) diameter tube							Standard	Optional	Swagelok® 8 VCR® female, NW 16 KF, mini-CF rotatable (High pressure units, 5000 to 25000		
mmHg F.S., are available with certain fittings; consult factory for a complete listing.)
Power Required
115/230 VAC, 50/60 Hz
Outputs
0 to 10 VDC into > 10K Ω load and 4 to 20 mA into < 500 Ω load
Electrical Connector
Mating connector P/N MS306A-14S-6S; MKS Connector Kit 220C-AC-K1
Ordering Code Example: 220DD00100A2B
Type 220DD	Type 220DD

Code220DD

Configuration
220DD

Pressure Range Full Scale
11020100
1000
5000
10,00015,00020,00025,00000001			00010			00020			00100			01000			0010005000			10000			15000			20000			25000Fittings½'' OD (12.7 mm) diameter tube
A			B				Swagelok 8 VCR female
A	Mini-CF, rotatable	C				NW 16 KF
DPower Input Code2
115/230 VAC	
2

Dimensional Drawing —Signal Input Code0-10 VDC and 4-20 mA

B

B

Note: Unless otherwise specified, dimensions are nominal
values in inches (mm referenced).

220DD - 8/16
© 2003 MKS Instruments, Inc.
All rights reserved.

MKS Instruments, Inc.
Global Headquarters

MKS Instruments, Inc.		
Pressure & Vacuum Measurement Solutions

2 Tech Drive, Suite 201
Andover, MA 01810

Six Shattuck Road
Andover, MA 01810

Tel: 978.645.5500
Tel:  800.227.8766 (in U.S.A.)
Web: www.mksinst.com

Tel: 978.975.2350

Some Baratron® capacitance manometer products may not be exported to many end user countries without both US and local
government export licenses under ECCN 2B230.
Specifications are subject to change without notice. mksinst™ is a trademark and Baratron® is a registered trademark of MKS
Instruments, Inc., Andover, MA. Swagelok® and VCR® are registered trademarks of Swagelok Co., Solon OH. Inconel® is a
registered trademark of Inco Alloys International, Huntington, WV.