BinMaster PROCAP capacitance sensors from HMA INSTRUMENTATION detect the presence or absence of material in contact with the probe by sensing a change in capacitance caused by the difference in the dielectric constant of the vessel material and air.
BinMaster’s capacitance probes use a unique discharge time constant detector circuit which allows sensing capacitance changes less than one picofarad without the need for radio frequencies. PROCAP capacitance sensors operate at approximately 6 KHz, well below the RF level and therefore are not subject to FCC regulation. Plus, because the PROCAP sensors operate at such a low frequency, they will not interfere with nearby electronic plant equipment and are not susceptible to interference from other equipment.
PROCAP capacitance probes use advanced integrated circuit technology operating at a low frequency to achieve both high sensitivity and stable calibration. The probe uses a simple timing technique that compares the discharge time of the probe capacitance to that of a reference capacitance. The probe’s outstanding stability results from several factors.
A single integrated circuit makes the critical timing comparison. Temperature variations have an equal effect on the timing of both the probe and reference capacitance and, therefore, cancel. 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.
Both the probe and the reference capacitance discharge are from a common voltage level. This makes calibration insensitive to power supply voltage variations.
Equal internal capacitance in both the probe and reference circuitry make any temperature dependent changes to these component values cancel. In addition, these internal capacitors have zero temperature coefficients and are physically located together to assure they are at equal temperatures.
New calibration stability, along with static discharge survival, and RF immunity are three of the main reasons why BinMaster probes outperform the competition.
HMA Group | Specialty Industrial Equipment
The HMA Group of Companies manufactures, sells and services a wide range of capital plant equipment to a diverse range of industries. This includes mining, processing, materials handling, water management, power generation, and oil and gas.
Our group divisions include HMA Materials Handling, HMA Wear Solutions, HMA Instrumentation, HMA Power Generation, HMA Flow & Industrial, HMA Geotechnical. We can provide state of the art industrial equipment and also offer customers sound advice, consultation and technical backup. With a team of qualified engineers with extensive product training and experience.
We can offer a complete service, from equipment selection, through to installation, commissioning and maintenance. Our offices and service facilities are located around Australia, New Zealand and in Indonesia and South Africa. We are ready to assist you from the project inception stage, right through contract engineering to installation, commissioning and full maintenance support.