RPS-8000 Controller With Remote Sensing Heads
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RPS-8000A, 8001A Features Various Sensing Ranges Narrow Sensing Beam Analog Current and Voltage High Frequency Isolated Form C Relay Outputs Temperature Compensation Sealed Transducer Small Remote Transducer OVERVIEW The RPS-8000A was designed for applications where 2 or more sensors are needed in a general area. The RPS-8000A can handle up to 8 TSR-3 transducers, and the RPS-8001A up to 8 SSR-3 transducers (stainless steel). These transducers are multiplexed so they can all operate in close proximity with each other without interference. Each sensor has three outputs: an analog voltage, analog current, and form C relay. The Analog outputs each have a zero and span control as well as an inverting switch if a decreasing signal with distance is desired. There is a 25 turn pot provided for each relay output so the detect point can be adjusted. Another feature is the instrument's ability to compensate for temperature changes. To accomplish this sensor "0" looks at a fixed distance and adjusts the circuit to give a proper reading. Since all the other channels use this same compensated circuit they, too, become compensated for temperature, humidity, and pressure changes. The RPS-8000A also has the ability to be controlled from an external source. When operated in this mode the user can direct any of the 8 sensors to output "S1". This then requires the need for only a single input. Another external control is the RATE. This controls the rate at which the sensors will update. TRANSDUCERS The RPS-8000A uses the TSR-3 transducer. This is a sealed sensor with a galvanized steel threaded housing and a silicone rubber sensing face. The RPS-8001A uses the SSR-3 transducer. This is a sealed sensor with a 303 stainless steel threaded housing and a 302 stainless steel sensing face. Both types of transducers have a narrow sensing beam. OUTPUTS The RPS-8000A has three different outputs per sensor. Any one or all of the outputs may be used at the same time. The relay output is a form C containing a N.O. and N.C. contact. It is rated for a .5 Amp. at 120VAC. The analog voltage output is 2 - 10 volts. It's load must be 5K or greater. The analog current output is 4 - 20mA. It's load must be 300 ohms or less. These analog outputs can be scaled to occur over a variety of ranges. ZERO & SPAN CONTROLS The RPS-8000A comes with zero and span controls for each sensor. These two potentiometers allow the analog signal to be adjusted over a desired range. The adjustment ratio is 5 : 1. This means that with the 4" to 12" range the analog output can be adjusted to give an output over a range as small as 1.6" or as large as 8". Example: If you desire a 2v signal at 5" and a 10v signal at 10" you would adjust the following way: 1. Turn the span (gain) control fully cw. 2. Adjust the zero (bias) control for 2v with a target 5" away. 3. Place target at 10" and check

the voltage. It should read higher then 10v so turn the span control a half turn CCW. 4. Adjust the zero control for 2v with the target 5" away. Recheck the reading at 10". If it is still high turn the span control CCW a half turn again and continue repeating these steps until the desired range is reached. ( NOTE: When adjusting the span control do not try to tune in the desired voltage or current. This must be achieved by adjusting the zero control and then checking the far range. ) INVERTING ANALOG SIGNALS Both the analog current and voltage outputs of the RPS-8000A can be inverted. In...

Specifications: Operational Range: Adjustable 4" to 12" Adjustable 5" to 36" Adjustable 8" to 72" Power Input: Input Current: Ambient Temperature: Enclosure: Controller Transducers Metal Nema 12 TSR-3 Galvanized Steel Housing, Silicone Rubber Sensing Face, Epoxy Filled SSR-3 303 Stainless Steel Housing, 302 Stainless Steel Sensing Face, Epoxy Filled 8 N.O. N.C. Relays, one per sensor .5 Amps at 120 VAC Analog Voltage 2 to 10 VDC Load 5K ohms or greater Analog Current 4 to 20mA Load 300 ohm or less Zero and Span Controls Inverting capability Response Time: 12mSec. Standard per channel User...