Bulletin PAS2100.011Distributed by:Cleveland ControlsDivision of UniControl, Inc.1111 Brookpark RoadïCleveland OH 44109TEL: (216) 398-0330ïFAX: (216) 398-8558Bulletin PAS2100.01ApplicationThe Model PAS-2100 Pneumatic Sens-ing Switch is a general purpose provingswitch for the HVAC and Energy Man-agement industry. It senses the flow ofair and provides a proportional pneu-matic signal for applications wherepneumatic actuation is required (such asintrinsically safe environments or anyarea where it is desirable to avoid elec-trical arcing).General Description &OperationThe PAS-2100 may be used to sensestatic or differential air pressure up to2.0 " w.c. The pneumatic switch vents aModelPASñ2100Pneumatic Sensing Switch with Adjustable Set PointCleveland ControlsDivision of UniControl Inc.(Figure 2)(Figure 1)via the two 3/16" diameter holes in theintegral mounting bracket. The mount-ing holes are 3-7/8" apart.Air Sampling Connection(see Figure 2)The PAS-2100 is designed to acceptfirm-wall sample lines of 0.25" OD tub-ing by means of ferrule and nut com-pression connections. For sample linesof up to 10 feet, 0.25" OD tubing is ac-ceptable. For lines up to 20 feet, use0.25" ID tubing. For lines up to 60 feet,use 0.50" ID tubing. A 0.25" OD adapter,suitable for slip-on flexible tubing isavailable: order part number 18311.Locate the sampling probe a minimumof 1.5 duct diameters downstream fromthe air source. Install the sampling probeas close to the center of the airstreamas possible. Refer to Figure 2 to iden-tify the high pressure inlet (H) and thelow pressure inlet (L). Select one of thefive application options listed below, andconnect the sample lines as recom-mended.Dimensions in Inches(Millimeters)restricted compressed air source untilreaching set point, where switch actua-tion closes the vent and sends a fullpressure pneumatic signal to an electri-cal switch outside of the hazardous area,or actuates a pneumatically driven ele-ment directly.The plated housing contains a dia-phragm, a calibration spring and a pneu-matic module with a 5-barbed connec-tor suitable for flexible tubing, rangingfrom 0.125" ID to 0.25" ID.The sample connections located on eachside of the diaphragm accept 0.25" ODmetallic tubing via the integral compres-sion ferrule and nut.Mounting (see Figure 1)Select a mounting location which is freefrom vibration. The PAS-2100 must bemounted with the diaphragm in any ver-tical plane in order to obtain the lowestspecified operating set point. Avoidmounting with the sample line connec-tions in the "up" position. Surface mountBulletin PAS2100.01Bulletin PAS2100.012Field AdjustmentThe adjustment range of a PAS-2100Air Switch is 0.15±0.01 to 2.0" w.c. Toadjust the set point, turn the adjustingscrew counterclockwise until motionhas stopped. Next, turn the adjustingscrew 4 complete turns in a clockwisedirection to engage the spring. From thispoint, the next ten turns will be used forthe actual calibration. Each full turnrepresents approximately 0.2" w.c.Please note: To properly calibrate anair switch, a digital manometer or othermeasuring device should be used to con-firm the actual set point.POSITIVE PRESSURE ONLY: Con-nect the sample line to inlet H; inlet Lremains open to the atmosphere.NEGATIVE PRESSURE ONLY: Con-nect the sample line to inlet L; inlet Hremains open to the atmosphere.TWO NEGATIVE SAMPLES: Con-nect the higher negative sample to inletL. Connect the lower negative sampleto inlet H.TWO POSITIVE SAMPLES: Con-nect the higher positive sample to inletH. Connect the lower positive sampleto inlet L.ONE POSITIVE AND ONE NEGA-TIVE SAMPLE: Connect the positivesample to inletH. Connect the negativesample to inlet L.Cleveland ControlsDivision of UniControl Inc.1111 Brookpark RoadCleveland OH 44109Telephone:(216)398ñ0330Telefax:(216)398ñ8558(Figure 3)Location of Sample Lines for Typical ApplicationsPressure Conversion Table1" H2O = .0361 lbs./sq. in. or .0735 in. mercury1" Hg. = .491 lbs./sq. in. or 13.6 in. water1 psi = 27.7 in. water or 2.036 in. mercurySpecificationsModel PAS-2100 PneumaticSensing Switch with AdjustableSet PointMounting Position: Mount with thediaphragm in any vertical plane.Set Point Range: 0.15 ± 0.01" w.c. to2.0"w.c.Output:Fan ON and Air Flow: 20 psig @0.15"w.c. or higherFan OFF and no Air Flow: º psig @0.015"w.c. or lowerMeasured Media: AirMaximum Pressure: 1 psi(0.06 bar)Operating Temperature Range: 0F to 135F (-17.8 to 57.2C)Life: 100,000 cycles minimum at 1 psimaximum pressure each cycle and atmaximum rated load.Sample Line Connectors: Male,externally threaded 7/16" 24 UNS 2Athread, complete with nuts and self-aligning ferrules.Sample Line Connections: Connectorswill accept 1/4" OD rigid or semirigidtubing.Shipping Weight: 2 lbs.Accessories:ïP/N 18311 Slip-on º" OD TubingAdapter, suitable for slipping onflexible plastic tubing.ïSample line probes.ïOrifice plugs (pulsation dampeners).Next >