Technical Specification Transmitter Type Intrinsically Safe Differential Transmitter Wetted Materials - Transmitters Alumina Ceramic, Aluminum, Epoxy, Glass, Gold, Nickel, PVC, RTV, Silicon, Stainless Steel Range Values - Transmitter -2.5 to 0 to 2.5 Range Units - Transmitter In. H2O/In. H2O Accuracy - Transmitter +/-0.50% Electrical Connections - Transmitter 4 Pin M12 Connector Power Required - Transmitters 10 to 35VDC Process Connection Size - Transmitter 1/8 Process Connection Type - Transmitter FNPT Shape - Transmitter Rectangular Overall Height - Transmitter 5.43 Overall Width - Transmitter 4.72 Overall Depth - Transmitter 3.44 Connection Location - Transmitter Bottom Output - Transmitter 4 to 20mA DC Display - Transmitter 4 Digit LCD Operating Temp. - Transmitter 32 Degrees to 104 Degrees F Safety Rating - Transmitter Class I Div. 1 Groups A, B, C, D; Class II Div. 1 Groups E, F, G; Class III Div.1 Wiring Entry - Transmitter None Loop Resistance 0 to 1250 Ohm Includes Instructions This listing is for each.
The Photohelic switch/gauge functions as versatile, highly repeatable pressure switches combined with a precise pressure gauge employing the time-proven Magnehelic gauge design. The Photohelic switch/gauge measures and controls positive, negative or differential pressures of air and compatible gases. Two phototransistor actuated, DPDT relays are included for low/high limit control. Easy to adjust setpoint indicators are controlled by knobs located on the gauge face. Individual setpoint deadband is one pointer width - less than 1% of full scale. Setpoints can be interlocked to provide variable deadband - ideal for control of fans, dampers, etc. Gauge reading is continuous and unaffected by switch operation, even during loss of electrical power. In typical applications, these switch/gauges control between high and low pressure set points. When pressure changes, reaching either set point pressure, the infrared light to the limiting phototransistor is cut off by the helix-driven light shutter. The resulting phototransistor signal is electronically amplified to actuate its DPDT slave relay and switching occurs. Dead band between make and break is 1% of full scale or less - just enough to assure positive, chatter-free operation. A plastic housing protects all electronic components. Solid-state and integrated circuit electronics are on glass-epoxy printed circuit boards and self-extinguishing terminal boards.<br><br> Photohelic switch/gauges are used to control pressures in air conditioning systems, clean rooms, fluidic and pneumatic control systems, materials handling equipment, alarm or control fume exhaust systems, control pressure in air structures, and monitor respiratory and blood pressures. 3-in-One Indicating gauge, low-limit and high-limit control set points and zero are easily adjusted on front of gauge
The Series DH Digihelic Differential Pressure Controller is a 3 in 1 instrument possessing a digital display gage, control relay switches, and a transmitter with current output. Combining these 3 features allows the reduction of several instruments with one product, saving inventory, installation time and money. The Digihelic controller is the ideal instrument for pressure, velocity and flow applications, achieving a 0.5% full scale accuracy on ranges from 0.25 to 100 in. w.c. The Digihelic controller allows the selection of pressure, velocity or volumetric flow operation in several commonly used engineering units. Two SPDT control relays with adjustable dead bands are provided along with a scalable 4-20 mA process output. In velocity of flow modes, a square root output is provided on the 4-20 mA signal to coincide with the actual flow curve. The Series DH provides extreme flexibility in power usage by allowing 120/220 VAC and also 24 VDC power which is often used in control panels. Programming is easy using the menu key to access 5 simplified menus which provide access to: security level; selection of pressure, velocity or flow operation; selection of engineering units; K-factor for use with flow sensors; rectangular or circular duct for inputting area in flow applications; set point control or set point and alarm operation; alarm operation as a high, low or high/low alarm; automatic or manual alarm reset; alarm delay; view peak and valley process readings; digital damping for smoothing erratic process applications; scaling the 4-20 mA process output to fit your application's range; Modbus communications; and field calibration. With all this packed into one product it is easy to see why the Digihelic controller is the only instrument you will need for all your pressure applications.