h PRESSURE SWITCHES - WE Instrumentation Limited

1 HMANUFACTURED IN THE SWITCHESSERIES 300 WITH ELECTRICAL OUTPUT FOR NON-HAZARDOUS AREASCONTACT HNL SALES SUPPORT ON 01642 765553 DATA SHEET TD300 ELC/EThe Series 300 PRESSURE SWITCHES offer accurate, reliableswitching in a robust cast enclosure. Featuring: COMPACT DESIGNH aving a width of only 70mm these SWITCHES are ideallysuited for applications where space may be Limited . Thedesign allows for any number of these SWITCHES to bemounted in a row whilst still providing easy access to theelectrical entry at the top of the switch and the processconnection at the bottom. COMPREHENSIVE RANGEThe Series 300 includes SWITCHES for monitoring bothpressure and vacuum. The ranges available from -1 to 600 Bar cover all medium to high PRESSURE industrialapplications. With a choice of aluminium or stainless steelIP66 housings these SWITCHES are equally well suited formounting on-site or use in between the wetted parts of the switch andyour process can be assured with a number of optionsavailable for both the process chamber and diaphragmmaterials.

2 WIDE RANGE OF OUTPUT SWITCHESThe wide range of electrical output SWITCHES availableincludes gold contacts for low current and silvercontacts for high current Switching differentials aretypically below 2% of the single pole double-throw microswitch (SPDT) can makeor break a circuit at the required switching point. Dualswitches (2 x SPDT) can make or break two independentcircuits at the same or different switching are also available for electrical switching inhazardous areas and pneumatic switching (see data sheetsTD300 HAZ and TD300 PNU). HIGH OVERLOAD RATINGSAll Series 300 PRESSURE SWITCHES use a diaphragm tomonitor the process PRESSURE . This type of switch canprovide high PRESSURE overload capabilities and is ideal forapplications where the maximum process PRESSURE canbe much greater than the required switching PRESSURE .

3 SIMPLE MAINTENANCET hese SWITCHES can provide many years of maintenancefree operation. However should the need arise output switchkits and diaphragm kits allow on-site repair rather thanreplacement to minimise the overall cost of ownership. PROVEN PERFORMANCES eries 300 PRESSURE SWITCHES have a long establishedreputation for providing good value without compromisingaccuracy and ASSURANCED esigned and manufacturedby HNL in accordance withBS EN ISO 9001 SERIES 300 DIMENSIONED OUTLINE1hCONTACT HNL SALES SUPPORT ON 01642 765553 DATA SHEET TD300 ELC/ESERIES 300 PRESSURE SWITCHESSPECIFICATIONS & CODINGNote on Vent Ring Option:As an additional safety feature, all of the Series 300 pressureswitches can be specified to include an optional vent ring. Itspurpose is to isolate the electrical housing from the process in theevent of process diaphragm failure, as a vent ring is included a new process diaphragm can be fitted toallow the switch to be returned to service.

4 Without a vent ring ingressof the process into the electrical housing may additionallynecessitate the replacement of the output switch or render theswitch of a vent ring will increase the overall length of the switchby RANGESSETPOINT RANGES (BAR)DIAPHRAGMCHAMBER PROOF RATING (BAR)RANGEMINMAX% 30345 PZ-1 230 30346 PZ-1 30344 30 30345 30 30346 230 30 3034B P11030 30 30347 P22135 35 35354 12 250 250355 P330 250 250356 P7703 250 250357 P20 210 350 350358 P60 600 1000 1000 DIFFERENTIAL PRESSURE RANGES344 30 30345 DPZ-1 230 30 30344 230 30 30345 30 30346 DP11030 30 30347 DP22135 35 35 Key to options: = available = not available = check availability with HNL Technical SaleshCONTACT HNL SALES SUPPORT ON 01642 765553 DATA SHEET TD300 ELC/ESERIES 300 PRESSURE SWITCHESSPECIFICATIONS & CODINGO utput Switch CodesSingle Twin SwitchOutput Switch RatingContactNotesSwitch 2 x SPDTM aterial1323250 Vac 4A, 28 Vdc 2A SilverHNL standard low differential microswitches1424125 Vac 800mA, 28 Vdc 800mA Gold1525125 Vac 800mA, 28 Vdc 800mA GoldEnvironment free encapsulated low differential microswitch1727250 Vac 4A, 28 Vdc 2A SilverEnvironment free encapsulated low differential microswitch1A2A250 Vac 6A, 28 Vdc SilverHNL standard encapsulated microswitches1B2B250 Vac 100mA, 28 Vdc 100mA GoldHousing Material:Aluminium housing with epoxy hardened.

5 Stoved enamel finishAustenitic stainless steel housing with self finishVent Ring:No vent ringWith vent ringElectrical Connections:M20 x top cable entry1/2 NPT INT. top cable entryProcess Connection:Rc 1/4 (1/4 INT. )1/4 NPT NPT NPT MaleChamber Material:Anodised Aluminium316 Stainless SteelHastelloy CDiaphragm Material:Nitrile-25 C to 90 CPTFE-40 C to 180 CHastelloy C -40 C to 200 CHousingCoding:ProcessOutput Switch345P1141137503 Range Code from table on previous page1 11 4160 10 30 60 8157127 Notes:1. Dust and weatherproof ratings are IP66 to BS EN 60529 (IEC60529).2. A Z within the range code signifies at or below zero. This isachieved with the use of a stainless steel biasing assemblywithin the process chamber. If stainless steel is not compatiblewith the process an alternative X option is available ( instead of 344PZ).

6 3. A large number of alternative threaded connections, diaphragm& chamber materials are available as special options. Pleasecontact HNL Technical Sales for on Output Switch Selection:1. Gold contact microswitches are especially well suited for lowvoltages and currents, or for applications with low switchingfrequencies or sulphurous atmospheres. When heavier loadsneed to be switched preference should usually be given to The use of twin SWITCHES will increase the basic reset by 1%. Thecombined reset band must not exceed 7%.3. When twin SWITCHES are set up to operate as DPDT, simultaneousoperation on both rising and falling pressures cannot be guaran-teed due to mechanical variations between The use of output switch codes 1A, 2A, 1B and 2B will increasethe basic reset by 1%.hCONTACT HNL SALES SUPPORT ON 01642 765553 DATA SHEET TD300 300 PRESSURE SWITCHESTECHNICAL SPECIFICATIONSC ombined Switching Errors & Maximum Working PRESSURE (MWP):In accordance with BS6134 1991:The sum of the average switching errors and the operating valuerepeatability will typically not exceed of range span, atsetpoints of 10%, 50% and 90% of span, at constant calibrationand measurement maximum working PRESSURE of the Series 300 SWITCHES x the proof PRESSURE .

7 It should be noted that diaphragm typeswitches generally have a high overload (Switching Differential):The reset varies throughout the range, normally increasing withsetpoint, and the figure quoted in the range table is the switchingdifferential value (as defined in BS6134) expressed as apercentage of the span at the mid range Temperature Ratings:Enclosures are rated for continuous use over thetemperature range 20 C to +85 C, with short term operationdown to 50 C .Storage limits for all enclosures are 50 C to +90 of the enclosure to direct sunlight should be such thatthe heat gain due to absorption of radiant energy does not causethe enclosure temperature to exceed the recommendedmaximum. Sufficient signal line cooling must always be providedto ensure that heat conduction from the process will not causethe switch enclosure to operate outside the stated ambienttemperature Coefficient:The additional error, relative to a setpoint calibration of 20 C, willnot exceed per 10 C change within the normal ambienttemperature range of the switch Options:For SWITCHES fitted with metallic diaphragms, a PTFE ring isincorporated on some ranges to provide additional sealing.

8 ShouldPTFE not be compatible with the process media please contactHNL Technical Sales for advice on Options & Specifications:For degreasing of process wetted materials for oxygen service and accessories,refer to data sheet TD OPT. For additional diaphragms, chamber materials andconnections, refer to data sheet TD product satisfies the requirements of the Low Voltage Directive 73/23/EECas amended by directive 93/68/EEC by compliance with standardsEN60947-1:1991 and EN60947-5-1 definitions are in accordance with BS6134:1991 ( PRESSURE andVacuum SWITCHES ).INTERNAL SWITCHVIEWM icroswitch ConnectingBlockPushrodSetpoint AdjustmentScrewMounting BracketPressure ChamberHNL Engineering Ltd comprises three Divisions offering a wide range ofproducts & services which includes:Instruments & ControlsPressure, DP and Temperature SWITCHES & Transmitters.

9 Rotary and linearpositioners. Flow regulators & Bubblers. Control MachiningTurning, Milling, Drilling, Tapping, Sawing, Welding, Painting, small to large batch sizes in a wide range of & ValvesWide range of distribution manifolds in both anodised aluminium andstainless steel. Stainless steel ball information contained in this data sheet may be changed without Industrial Estate Thornaby-on-Tees TS17 9LT UKTel: +44 (0)1642 765553 Fax: +44 (0)1642 762899 Email: & ControlsPrecision MachiningManifolds & Valves