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Hitachi renovated the lineup of immersion-type level transmitters.
The pressure sensors—the heart of the level transmitters —employed in the new series are Hitachi’s highly reliable, well-proven semiconductor pressure sensors.
The sensors detect eligible pressure changes and provide stable measurements from a minimal level change in low level water to a large level change in dams. As proven by Hitachi pressure gauges used in severe chemical plant environments, the precision and long-term stability of the sensors will be well demonstrated under a variety of different conditions.
The ﬂexible designs offered by the selection of models support a wide range of applications from artesian wells to low-level measurements and fulﬁll the needs for sewage (optional) as well. The sewage type employs a diaphragm protective cover with PET ﬁlm to enhance maintainability. It also incorporates a highly corrosive-resistant FEP cable. Furthermore, the communicator (optional) remotely sets and modiﬁes the measuring ranges and performs self-diagnosis, allowing for measurement in remote or heavy snowfall areas.
The ELR200 series includes a variety of product types. In addition to the integral (model ELR 200) and separated types (model ELR200R), the optimal model can be selected with options best suited for a speciﬁc use or installation environment, consisting of the ﬂoor bracket, indoor/outdoor power supply (100 VAC and 24 VDC), and the cable relay box.
Water levels are measured by simply hanging the sensor in the water, which means the sensor is easy to install and handle. As long as the measuring range is between 0.1 m and 100 m, it can be applied to any ﬁeld from waterworks, sewage, rivers, dams, and wells to irrigation.
|Measuring method||Semiconductor pressure sensor|
|Measuring range and accuracy||Item||Model ELR200, integral type||Model ELR200R, separated type|
|Measuring range||0-0.1m to 0-1m||0-1m to 0-20m||0-2m to 0-60m||0-60m to 0-100m|
|Accuracy for each span||0.1–0.2 m: +/-0.3% of span
0.2–1 m: +/-0.2% of span
|1–3 m: +/-0.3% of span
3–20 m: +/-0.2% of span
|2–5 m: +/-0.3% of span
5–60 m: +/-0.2% of span
|0–100 m: +/-0.2% of span|
|Output signal||4–20 mA DC|
|Operating temperature range||–10°C to 60°C (non-freezing)|
|Indicator||Model ELR200: 3 1/2 digit actual water level (m) display
Model ELR200R: 4 1/2 digit actual water level (m) display
|Arrester||Built-in (built-in model HR-DS arrester for model ELR200)|