GENERAL The digital pressure switch PDS-270 measures a differential pressure in spans between 175 and 48000 mmH2O with a static pressure up to 100bar. The pressure measuring element is a piezoresistive sensor. It is possible to choose between sensors to satisfy the process conditions. The sensor generates a signal corresponding to the actual pressure and it is complete with a PTC thermistor which also transmits the temperature of the measuring cell to the electronic system. On the basis of these two values and of the configured parameters the electronic system generates a output signal and displays all the necessary data on the LED display. The operating parameters can be changed by means of the four pushbuttons that are below the LED display. Among the relevant characteristics of this microprocessor based digital pressure switch, are the following: -wide rangeability for the measuring span. -square root extraction selectable -automatic temperature compensation in the measuring cell
FUNTIONAL DATA Maximum Pressure : 2times of nomial range. (Option : Max 100kg) Accuracy : 0.5% F.S ±1 Digit Temperature : 14+0.05% F.S./℃ (Accuracy ±0.05% F.S) (Zero, Span) Power : 24 V DC, AC 110~220V(Option) Display : 3-1/2 LED(number height 14.2mm) Cycle : approx. 0.2sec. Output : (either one of followings) Relay Output : single 2 contact. Response Time : within 10msec Electrical Rating : 110VAC 0.2A (resistance load) High Limit, Low Limit, Diff Contact : Working point within output range Analog output : 4~20mA DC or 1~5VDC(standard) Responding ; Within 10msec Resistance Load : 40 Max.(current output) 10 Min (voltage output) Option (For more details, Please contact factory) 1) Pick hold function 2) Comparator output 3) Dual unit display 4) 0~10V output Working Temperature : 0~50℃ Storage Temperature : -20~70℃ Material : Wetted Part - SUS 316. NER. Case - Aluminum Weight : approx. 400g.
ENVIRONMENT AND CONDITIONS Temperature: Process fluid : -20 ~ + 100℃ Housing : -20 ~ + 80℃ Handling and storage : -20 ~ + 90℃ Relative Humidity : 0 ~ 100% R.H. LCD display reading : -10 ~ + 65℃ Performance Unless otherwise stated, performance specifications are referred at atmospheric pressure, nominal span, silicone oil filling and are given as a percent of span. Accuracy rating: it is assured within the following limits. Non linearity : resettable with 0.1% accuracy. Repeatability : = 0.10%. Hysteresis : = 0.10%. Dead band : negligible. OPERATING INFLUENCES Thermal drift: It is referred to -10 ~ + 65℃ range. Zero: ± 0.1%/10。K. Span: ± 0.1%/10。K at nominal range. Static pressure effect Zero: ± 0.5% / 10 bar. Span: ± 0.5% / 10 bar Over range effect Zero: on either side ± 1% at 50bar. Power supply effect : Negligible between 12.35 and 30 V dc.
PHYSICAL SPECIFICATIONS Process wetted parts : Diaphragm in SUS 316 L / hastelloy C - process chambers and adapters forged steel UNI Fe50 / SUS 316 - drain and vent plugs SUS 316 - gaskets PTFE + Viton - bolts carbon steel / SUS 304. Housing : die cast aluminium alloy AL UNI 4514 finished with epoxy resin (RAL 5014). Filling fluid : silicon oil. Nameplate : stainless steel, fixed on housing. Bracket for 2" pipe mounting: zinc coated carbon steel Calibration Standard: at nominal range, direct action, transmitter mode. Optional: at the conditions specified with the order. Environmental protection: the transmitter is dust and sand tight and protected against sea waves effects as defined by IEC IP 66. Suitable for tropical climate operation as defined in DIN 50.015. Process connections: See table 1. Electrical connections : two cable entries on electronic housing, 1/2" NPT and cable gland PG 13.5 for 7 to 12mm diameter cable. Terminal board : 2 terminals for signal wiring up to 1.5 ㎟ (14 AWG). Connection for ground and cable shield. Mounting position : any position. EXPLOSION PROTECTION Classification Type: intrinsic safety Ex ia IIC, T6, T5, T4 Max Amb. temp.: 40℃ for T6, 55℃ for T5, 80℃ for T4 Condition A No-load voltage: = 30 V d.c. Short circuit current: = 120 mA. Max transferred power: 0,75 W. Condition B No-load voltage: = 25,2 V d.c. Short circuit current: = 152 mA. Max transferred power: 0,95 W. Note Explosion proof feature (Exd 〔ia〕 IIC T6) with the application of barrier
|