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HewTech Electronics LLC has developed a low-cost Quantity Gauge for Fuel-Level measurement for vehicles / systems using LIQUEFIED NATURAL GAS (LNG) as a Cryogenic Fuel. The Model SSU-33/240 is a signal conversion, level sending unit. The device interprets the measurement signal received from the probe, converts the liquid-level measurement to a compatible signal which can be displayed using a common 33~240 ohm automotive-type FUEL gauge (optional). The control utilizes analog & digital technology to precisely monitor the tank probe condition. The ZERO adjustment determines the EMPTY (0%) point of the probe. The design provides for various probe selection, by positioning a probe-select jumper. The probe-select jumper compensates for the different probe characteristic capacitance. ZERO & SPAN have been pre-calibrated to correspond to specific (capacitive characteristics) probes. The design takes into consideration intrinsic-safety
practices by supplying 5 volts DC circuit power. Low total circuit capacitance (less than 1-microfarad),
negligible inductance (no inductors used) and total DC signal isolation to the
probe. Supply power is from 12 Volt
vehicle battery
Enclosure:
IP54/65 (NEMA 4/5 Dust & Moisture proof)
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Copyright 1998 |
