The Bin Control PROCAP Series capacitance probes from Bin Control use advanced integrated circuit technology operating at low frequency to achieve both high sensitivity and stable calibration. The probe uses a simple timing technique t hat compares the discharge time of the probe capacitance to that of a reference capacitance.
Bin Control PROCAP probes outstanding stability results from several factors. (1) A single integrated circuit makes the critical timing comparison. Temperature variations have an equal effect on the timing of both the probe and reference and, therefore, cancel. (2) The time interval at which the discharge comparison is repeated is not involved in the sensing process, making calibration independent of oscillator frequency and stability. (3) Both the probe and the reference capacitance discharge are from a common voltage level. This makes calibration insensitive to power supply voltage variations.
Bin Control PROCAP Series capacitance sensors provide high sensitivity and accurate level detection without using radio frequency (RF) signals. According to the Federal Communications Commission, signals in excess of 9 KHz are classified as “RF” and are prone to radiate. Competitive capacitance sensors that emit RF signals may interfere with nearby electronic plant equipment.
Calibrating the Bin Control PROCAP Series sensors is made simple and precise with the Quick-Set design. Two single turn potentiometers are used to calibrate the sensor once it is installed in the vessel. One potentiometer labelled “fine” is set to the desired sensitivity for the vessel material. However, material does not need to be present when calibrating PROCAP Series sensors. And that’s it. Two quick turns and the sensor will maintain precise calibration and dependable operation even throughout temperature changes.
The Bin Control PROCAP Series sensors feature PRO-Shield to guard against false readings from build-up on the probe or bridging between the sidewall and the probe. The shield is a portion of the probe that emits a non-sensing signal that forces the active signal to examine a large area around the probe. The PRO-Shield allows the PROCAP Series sensors to be used in vessels storing a wide variety of dusty, sticky, or clinging materials.
The Bin Control PROCAP Series time delay feature minimizes false signals from sudden material shifts or splashing liquids caused by pro- cess activities. The time delay operates by "delaying" a set period of time prior to acknowledging the signal for a change in the presence or absence of material. The time delay is simple to adjust and may be set up to 30 seconds.
The Bin Control PROCAP series capacitance sensors feature fail-safe protection to eliminate process accidents caused by a power failure. A high/low selectable switch allows the sensor to be set for fail-safe high or fail-safe low.
The Bin Control PROCAP Series capacitance sensors are designed for industrys’ wide array of applications. PROCAP Series sensors may be used in solid, liquid and slurry materials. The sensors may be used for high and low level detection in bins, silos, tanks, hoppers, chutes and other vessels where material is stored, processed or discharged.
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