627 Series Intrinsically Safe Submersible Liquid Level Transmitters

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A level transmitter provides a continuous signal - typically 4?20 mA or 4?20 mA with HART® protocol - that represents the entire usable range of the tank. A level switch is a discrete instrument that simply changes state at a defined point, which is ideal for alarms and pump start/stop functions.

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Submersible transmitters are a strong choice in wells, sumps, and lift stations where side or top nozzles are limited and level is best sensed from below. For harsh water and wastewater environments, a cage-protected design helps keep the sensing diaphragm safe from debris, slurry and sludge.

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Sanitary applications demand crevice-free wetted surfaces, hygienic connections, and materials that meet standards such as 3-A or ASME-BPE. NOSHOK offers intelligent tank and silo transmitters with polished 316L Stainless Steel housings which are engineered specifically for these hygienic requirements.

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During CIP and SIP, instruments are exposed to hot caustic solutions, steam, and rapid temperature swings, so seals, diaphragms, and electronics must be designed for repeated thermal cycling. Modern sanitary transmitters place pressure and temperature sensors directly behind a compact flush diaphragm to provide active temperature compensation and maintain accuracy through cleaning cycles.

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Flush diaphragms eliminate dead legs where product can stagnate, which improves cleanability and reduces contamination risk. In balance tanks, compact flush-diaphragm transmitters with fast temperature compensation also give rapid, stable readings that help prevent overflows and low-level trips.

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Using standardized Tri-Clamp or ASME-BPE clamp connections allows instruments to be swapped without adaptors, simplifying maintenance, cleaning validation, and compliance documentation. NOSHOK sanitary transmitters are offered with a broad range of hygienic clamp and spud-style connections, so they integrate easily into existing food, beverage, and dairy vessels with no adaptors required.

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For suction protection, place a point level device just above the minimum safe liquid height and use a continuous transmitter to control normal start/stop levels. For transfer or filling applications, a high level switch near the top of the vessel provides a hard overfill limit that backs up the continuous level signal.

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HART® is a digital communication signal superimposed on the 4?20 mA loop, allowing you to remotely range, trim, and diagnose transmitters over the same two wires. Level and pressure devices often offer optional HART®, which lets you access extended configuration and status information without removing the instrument from service.

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A transmitter with a 10:1 turndown can be configured for a wide variety of spans, so one model can cover several tank heights or product densities. Intelligent sanitary transmitters use this capability to reduce spare-parts inventory while still maintaining accuracy on the adjusted span.

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A rotatable, backlit display allows operators to instantly read process variables (like tank volume, height, or percentage) and configure device settings in the field, even in tight installations.

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A cage-protected version surrounds the sensing diaphragm with a perforated guard, deflecting rocks, rags, and heavy solids while still allowing pressure transmission. This style is particularly well suited for sludge tanks, storm canals, and municipal lift stations where unprotected sensors can be easily damaged.

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In classified hazardous locations such as wellheads, digesters, or solvent storage, intrinsic safety ensures that the energy in the instrument circuit cannot ignite a flammable atmosphere. NOSHOK offers submersible and head-mounted transmitters that have approvals like FM and CSA to meet these requirements.

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When a device's stated accuracy is tied to the adjusted span rather than full scale, you retain high accuracy even after narrowing the range in the field. This is especially beneficial in food and beverage tanks where working levels may be only a fraction of the sensor's maximum rating.

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Corrosion resistant materials such as 316/316L stainless steel, PVDF, PUR cables, and Hastelloy C-276 wetted parts help level instruments survive aggressive or high chloride media, preventing stress cracking and corrosion over time. Choosing the appropriate wetted materials up front is critical for minimizing downtime and avoiding premature diaphragm or cable failures in harsh oil and gas, chemical, and water/wastewater environments. In sanitary food and beverage applications, NOSHOK level and pressure transmitters use 316L stainless steel wetted parts with polished, crevice free surfaces that meet 3-A requirements and are fully compatible with CIP/SIP cleaning.

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By continuously measuring process temperature at the diaphragm and applying compensation in real time, the transmitter minimizes temperature-induced errors in the sensor and fill fluid. This technology keeps readings stable during CIP/SIP, batch heating, or cold-start conditions.

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In addition to level or pressure, a smart device can expose sensor temperature, error codes, configuration changes, and status flags such as signal saturation or over range. This information can be used to identify plugged impulse paths, empty tanks, or failing sensors before they cause process interruptions.

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Yes, in some applications you can mount a radar level instrument outside the tank, provided several conditions are met. With a non-contact radar, external mounting is feasible when the tank or container wall is made of a radar-transparent plastic and the wall thickness is within the limits recommended by the manufacturer.

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Yes, the LTI20 is designed for simple field calibration. Using the supplied magnet, you touch and hold it at the CAL label on the housing to initiate the calibration routine. This magnetic key method allows calibration without opening the housing, preserving the environmental seal.

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Hydrostatic transmitters are ideal for continuous level measurement in wells, lift stations, and tanks where the media is relatively clean. Vibrating fork switches are excellent for high or low point-level protection and pump run-dry protection when you need simple binary level alarms. Radar level transmitters provide continuous, non-contact level measurement that excels in applications with varying dielectric properties, agitation, or where you want to avoid any wetted sensor in the tank.

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Many plants choose a common platform of level and pressure transmitters with shared programming, displays, and communication options, then vary only connection type or range. This approach helps streamline training, commissioning, and spare-parts management.

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Level transmitters and switches ensure that a pump only operates when there is sufficient liquid present, preventing overheating, excessive wear, and potential cavitation caused by air ingestion. Early empty-pipe detection via continuous level monitoring or a point-level switch minimizes unplanned downtime and protects the pump.

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In food and beverage measurement, hygienic and sanitary are closely related but not always identical. Sanitary often implies conformity with specific regulations or standards such as 3-A or ASME-BPE clamp designs, while hygienic is a broader term describing designs that are cleanable, drainable, and resist product buildup. In practice, many engineers and OEMs use the terms interchangeably when referring to level and pressure instruments that feature polished stainless steel wetted surfaces, crevice free process connections, and CIP/SIP ready construction.