EXPLOSION PROOF PRESSURE SWITCH MODEL : P953 SERIES

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Sheena Potter
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EXPLOSION PROOF PRESSURE SWITCH MODEL : P953 SERIES SERVICE INTENDED P953 Diaphragm type pressure switch is applied with a variety of process lines.

Standard Features APPROVED BY STANDARDS Explosion Proof(Exd IIC T6) ADJUSTABLE RANGE 300mmH2O ~00kg/cm 2 DIMENSION Refer to Drawing Type MATERIAL Case & Cover : ALDC Pressure Connection : 36SS

1 EXPLOSION PROOF PRESSURE SWITCH MODEL : P953 SERIES SERVICE INTENDED P953 Diaphragm type pressure switch is applied with a variety of process lines. Internal micro switch is operated by pressure of various fluids, such as atmospheric pressure and water pressure. The pressure sensing is a force-balance, piston actuated assembly. Standard Features APPROVED BY STANDARDS Explosion Proof(Exd IIC T6) ADJUSTABLE RANGE 300mmH2O ~00kg/cm 2 DIMENSION Refer to Drawing Type MATERIAL Case & Cover : ALDC Pressure Connection : 36SS Diaphragm : 36SS & Viton Bracket : SCP2 REPEATABILITY ±.0% of Adjustable Range ADJUSTABLE 300mmH2O - 00kgf/cm 2 CONTACT Micro Contact Type One SPDT (Model : P953-B3) Two SPDT (Model : P953-2B3) CONDUIT CONNECTION 3/4 NPT ELEMENT Diaphragm PROCESS CONNECTION /4, 3/8, /2 PF, PT and NPT

2 ORDERING INFORMATION BASE MODEL P953 : EXPLOSION PROOF PRESSURE SWITCH (Only available with single set point) PD09-05 SWITCH FORM : One SPDT 2 : Two SPDT UNUSED CHARACTER B3 PROCESS CONNECTION C : /4 D : 3/8 E : /2 CONNECTION TYPE B : PF C : PT D : NPT MEASURING UNIT B : kgf/cm 2 G : mmh2o RANGE (Refer to Measuring Range Table) XXX PRESSURE CONNECTION ELEMENT MAT L 3 : 36SS & 36LSS V : 36SS & Viton OPTIONS 0 : None : Accessories P953 2 B3 E D B 04 V 0 SAMPLE MODEL NUMMBER

3 PD09-05 P953 : TYPE OF MOUNTING

4 PRESSURE SWITCH A bi-stable electro mechanical device than actuates/deactuates one or more electrical switching element at a predetermined discrete pressure upon rising or falling ADJUSTABLE RANGE The span of pressure between upper and lower limits within which the pressure switch can be adjusted to actuate/ deactuate. It is expressed for increasing pressure. SETPOINT That discrete pressure at which the pressure switch is adjusted to actuate/deactuate on rising or falling pressure. It must fall with the Adjustable Range and be called out as increasing. DEADBAND The difference in pressure between the increasing Set Point and the decreasing Set Point. PROOF PRESSURE The maximum input pressure that can be continuously applied to the pressure switch without causing permanent change of set point, leakage or material failure. BURST PRESSURE The maximum input pressure that can be continuously applied to the pressure switch without causing leakage or catastrophic material failure. Permanent change of Set Point may occur, or the device may be rendered inoperative. REPEATABILITY The ability of a pressure switch to successively operate at a Setpoint that is approached from a starting point in the same direction and returns to the starting point over three consecutive cycles to establish a pressure profile. The closeness of the measures Set Point values is normally expressed as a percentage of full scale (maximum adjustable range pressure). PD09-05 PRESSURE RANGE TABLE CODE ADJUSTABLE RANGE kgf/cm 2 PSI DEAD BAND ONE SPDT SET POINT TWO SPDT SET POINT mmh2o(kgf/cm 2 OVER RANGE BURST RANGE PROOF RANGE kgf/cm 2 PSI ~ ~ ~ ~ ~ ~ ~ 0.6~4.3.~7..28~8.5.7~.4 2.~4.2 Within Within 5% of 0% of Adjustabl Adjustabl e Range e Range 50% of ~2 4.3~28.4 Adjustable ~3 6~42.7 Range ~6 2.8~ ~0 2.3~ ~5 32~ ~ ~ ~30 7.5~50 64~498 07~ ~70 5 ~00 49~996 23~ *If Set Point has below 0.5kgf/cm 2, The element material is applied Vi to n.

5 RATED VOLTAGE RESISTANCE LOAD NC NO INDUCTIVE LOAD NC NO 25V AC 5(0) 5(0) 250V AC 5(0) 5(0) 480V AC 0 0 8V DC 5 5 4V DC V DC 2 25V DC V DC SPDT SWITCHING ELEMENT Single-Pole, Double Throw(SPDT) has three connection : C-Common, NO-Normally open and NC-Normally closed, which allows the switching element to be electrically to the circuit NO or NC state. DPDT SWITCHING ELEMENT Double-Pole, Double Throw (DPDT) is two SPDT switching elements operated by a common lever assembly so simultaneous actuation / deactuation occurs at both the increasing and the decreasing set point. Two independent electrical circuits can be switched, i.e. one AC and one DC. P953 B3 TYPE When the input pressure reach the upper or lower limit set point, The circuit is closed and opened. off on 0 Set Max. : : COM : NC P953 2B3 TYPE When the input pressure reach the upper or lower limit set point, Two circuit are simultaneously closed and opened. off on 0 Set Max. off on, : NO, : COM, : NC 0 Set Max.

6 CONVERSION TABLE PRESSURE CONVERSION CHART CONVERSION TABLE PSI ATM kg/cm in.h2o mmhg in.hg kpa Bar mmh2o DENSITY CONVERSION CHART lb/ft gm/cm kg/m lb/in VOLUME CONVERSION CHART GALLON (U.S) FEET INCHES BARRELS (OIL) CM METER LITER IMP. GALLON MASS CONVERSION CHART lb oz kg gm gal H2O (32F) long ton metric tonne ton

Explosion proof pressure switch Model: P953 series

Explosion proof pressure switch Model: P953 series Spec. sheet no. PD09-08 Service intended P953 diaphragm type differential pressure switch can be used in a variety of process lines. Internal micro switch