Introduction: A 1bar ceramic sensor range fits low-pressure water, air, and other liquid lines, while absolute pressure and high-pressure hydraulics need different sensing choices.
A 0-1 bar gauge sensor core is not a general-purpose pressure device. It is a low-pressure part with a specific reference point: the local atmosphere. That makes it a good fit for many water lines, tank heads, and light positive-pressure gas or liquid circuits, but a poor fit for vacuum measurement, absolute-pressure work, or hydraulic lines that operate far above 1 bar. The useful question is not whether the sensor is "accurate" in a general sense, but whether the line's normal pressure sits inside that 0-1 bar gauge window.
Gauge pressure is measured relative to the surrounding atmosphere. A gauge sensor with a 0-1 bar range reads 0 bar when its pressure port is open to the same air pressure as the room, and it reads 1 bar when the line pressure is 1 bar above that local atmosphere. In SI terms, 1 bar is 100 kPa. The sensor does not read "absolute" pressure from a perfect vacuum, and it does not compare two process ports. It reads a positive pressure difference between the line and the local air. That reference point is why the same physical pressure can appear as one number on a gauge sensor and a different number on an absolute sensor. At sea level, for example, a line at 0 bar gauge is already near 1.013 bar absolute because the atmosphere is pressing on everything. The 0-1 bar core is built for the positive gauge window only. A line that runs below atmosphere, or one whose pressure is described in absolute terms, needs a different reference. Also, 1 bar full scale is a measuring range, not a strength rating. The RS186/RS183 core is a 0-1.0 bar gauge ceramic sensor core with a φ18 mm body, 2-30 V DC excitation, and a typical 2.0 mV/V/FS output. Its overload pressure is above 2×FS and its burst pressure is above 5×FS. Those higher numbers are safety limits for accidental pressure spikes. They do not turn the core into a 2 bar or 5 bar sensor, and they should not be used as normal operating ranges. A designer choosing this part should keep the normal line pressure inside 0-1 bar gauge and treat every excursion above full scale as a fault condition to avoid, not as extra measuring headroom.
A 1bar range is most useful when the water system is deliberately low pressure and the normal operating point sits comfortably inside the span. That is common in building water loops, small tanks, light process lines, and positive-pressure air or liquid circuits. The exact setpoint depends on the system, but the range logic is consistent: the sensor's full scale should sit above the highest normal operating pressure, and the expected pressure should not spend its life at the very top of the span. The three scenarios below show where the 0-1 bar gauge window fits naturally.
In all three cases, the sensor is reading a positive gauge pressure, not a level, flow, or absolute pressure. A tank head is a pressure that happens to relate to depth; a pump loop pressure is a pressure that relates to circulation; an air line pressure is a pressure that relates to the gas system. The 1bar range is the common thread, but the system reason for using it is different in each case.
The 1bar range stops being appropriate when the pressure reference is wrong or when the normal operating pressure is far outside the span. Absolute-pressure measurement is the first clear mismatch. An absolute sensor uses a sealed vacuum reference and reports pressure above perfect vacuum. A 1bar gauge core uses the local atmosphere as its zero. At sea level, 0 bar gauge is about 1.013 bar absolute, so a gauge core cannot report an absolute pressure directly. It also cannot measure vacuum or negative gauge pressure in the way a compound or absolute sensor can. If the process is described in absolute terms, choose an absolute sensor rather than trying to convert a gauge reading after the fact. High-pressure hydraulics is the second clear mismatch. Hydraulic lines often work at tens or hundreds of bar, and a 1bar full-scale sensor has no useful resolution in that world. The overload and burst ratings are not a licence to use the part on a high-pressure line. A core rated for 0-1 bar gauge with overload above 2×FS and burst above 5×FS may survive a brief spike, but it is not a 5 bar measurement device. On a 100 bar hydraulic line, the sensor would be far beyond its full scale and safety limits. The correct choice is a high-pressure sensor with a range and pressure connection matched to the hydraulic circuit. The same logic applies to any water system whose normal pressure is well above 1 bar gauge: a higher range is not an optional extra; it is the basic fit.
A 0-1 bar gauge ceramic sensor core is a focused low-pressure part. It fits water, air, and liquid lines whose normal positive gauge pressure stays inside the 0-1 bar window, and it gives designers a clear full-scale reference for shallow tank heads, low-pressure circulation loops, and light positive-pressure lines. It does not fit absolute-pressure measurement, vacuum service, or high-pressure hydraulics. The practical decision is to compare the line's normal gauge pressure with the sensor's full scale, then keep the overload and burst figures where they belong: as safety limits, not as hidden extra range. Readers who want to check the exact core dimensions and electrical figures can review the product data before matching it to a low-pressure line.
A: It means the sensor reads pressure above the local atmosphere, from 0 bar at atmospheric pressure to 1 bar at 100 kPa above atmosphere. In a low-pressure water line, that range covers positive gauge pressures that stay inside that window, such as a shallow tank head or a lightly pressurised loop. It does not cover vacuum or absolute pressure.
A: No. A 1bar ceramic pressure sensor core with a gauge reference uses the local atmosphere as zero, while an absolute sensor uses a sealed vacuum reference. At sea level, 0 bar gauge is about 1.013 bar absolute, so the gauge core cannot report absolute pressure directly. Absolute-pressure work needs an absolute sensor with the correct reference.
A: A 1bar range has a full scale of only 100 kPa, while hydraulic lines often run at tens or hundreds of bar. The overload rating above 2×FS and burst rating above 5×FS are safety limits for accidental spikes, not normal measuring ranges. A hydraulic line needs a sensor whose measuring range and pressure connection are matched to the working pressure.
Bioprocessing Equipment - ASME
