168 Low Differential Pressure Transducer
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alpha" instruments The Model 168 Series are low range differential pressure transducers and transmitters with NEMA 4 (IP-65) rated aluminum enclosures. They are very rugged and very reliable, good for many industrial applications. The Model 168 Series are available for full scale pressure range from 0 to 0.1"WC till 0 to 100"WC. Both unidirectional and bidirectional pressure ranges are offered. The output of the Model 168 Pressure Transducer is available in two versions: 0 to 5VDC and 0 to 10VDC, where 0VDC is true zero without offset. The output of Model 168 Pressure Transmitter is 4 to 20 mA. All units are temperature compensated. The accuracy can be 0.6%, 0.4% or 0.25% at room temperature. The patented variable capacitance pressure sensor is constructed by stainless steel and glass, no glue or other organics. That provides excellent performance, corrosion resistance and long-term stability. Additionally, our unique production setup allows us to accommodate special orders for nonstandard pressure ranges (e.g. -0.5"WC to +3.5"WC). Model 168 Specifications Performance Data Accuracy* (at room temp) Non-Linearity (BFSL) Hysteresis Non-Repeatability Thermal Effects: Zero/Span Shift (/°F) Compensated Range Maximum Line Pressure Overpressure Stability Warm-up Shift 0 to 185° F(-18 to 85°C) 15PSI(100kPa) 15PSI(100kPa) in Positive or Negative Direction for all Ranges ±0.5% FS/YR ±0.1%FS Applications: ■ Power Plant Air Flow Monitor and Control ■ Clean Room and Fume Hood Control ■ Duct Static Pressure Measurement ■ Draft Control ■ HVAC and VAV Control ■ Furnace air flow Control Features • Up to 15 PSI Overpressure on All Ranges • Incorrect Wiring Protection • Unsymmetrical Bidrectional Pressure Ranges • True Zero Output for Voltage Unit • Rugged Aluminum Housing Rated NEMA 4/IP 65 • Meets C€ Conformance Standards • Meets RoHS Requirements • Pressure Ranges as Low as 10Pa only! Position Effect Each unit is calibrated in the vertical position. For best accuracy, adjust zero of the unit if it is mounted in other position. It is not necessary to adjust the sensitivity. * RSS of Non-Linearity, Hysteresis, and Non-Repeatability. Environmental Data and Physical Description Operating Temperature Storage Temperature Electrical Termination Pressure Fittings Zero & Span Adjustment Pressure Media Enclosure Protection Rating Weight Installation 0 to 185° F(-18 to 85°C) -65 to 220° F(-54 to 105C) Pluggable Terminal Block with PG-9 or PG-7 Strain Relief 3/16” O.D. barbed brass for 1/8” I.D. push-on tubing(standard). 8mm O.D. barbed brass(optional). Accessible Inside of Enclosure. Typically air or similar non-conducting gases. Die-cast aluminum. NEMA 4/IP65 11.5OZ/330g There are two 0.165 inch dia. mounting holes inside the enclosure. Two M3 X 6 pan head screws with spring washers are included in the box. Outlines see diagram 1. Stainless steel mounting plate with tabs is optional. Visit us Online: www.alphainstruments.com E-mail: sales@alphainstruments.com 978-2

Model 168 Specifications Electrical Data (Voltage) Circuit Excitation Output* Output Impedance * 3-Wire (+EXC, -EXC, OUTPUT)，Protected against incorrect wiring 16-32VDC 0-5VDC， 0-10VDC ≤5.0 OHMS Zero output: factory set at ±25mV(0-5VDC), ±50mV(0-10VDC) Span output: factory set at ±25mV(0-5VDC), ±50mV(0-10VDC) Calibrate with a 50K OHM load. Operable with a load greater than 5K OHM for 0-5VDC output, greater than 10K OHM for 0-10VDC output. Electrical Data (Current) Circuit Output Bidirectional Output at Zero Excitation External Load * 2-Wire（+EXC, -EXC）, Protected against incorrect wiring...