Small Accurate Temperature Sensor

Würth Elektronik (Waldenburg, Germany) is introducing a 2.0 × 2.0 × 0.5 mm temperature sensor. Its accuracy in the measuring range of -40 to 125°C is ±0.5°C, while in the range of -10 to 60°C it goes down to ±0.25°C. Applications extend from PCB temperature monitoring and system monitoring for power supplies, heating, ventilation, air conditioning, and cold chain monitoring, to sensor technology in industrial controls, domestic appliances or wearables.

The sensor is factory calibrated and can therefore be used without time-consuming remeasurements. The sensor’s 16-bit output signal can be read out via an I²C interface with output data rates up to a maximum of 200 Hz. An additional interrupt pin can optionally be used to indicate when a programmed temperature threshold value is exceeded. WSEN-TIDS is well suited for battery powered applications as it operates from 1.5 to 3.6 V and draws a current of only 1.75 μA.

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Barometric Pressure Sensor for Smartphones, Wearable, and Hearable Devices

Bosch Sensortec (Reutlingen/Kusterdingen, Germany) announces the BMP390, a barometric pressure sensor that delivers high accuracy for altitude tracking in smartphones as well as wearable and hearable devices. The new sensor can measure height changes below 10 centimeters thanks to improved resolution and is 50 percent more accurate than its predecessor.

Typical relative accuracy is 0.03 hPa, typical absolute accuracy is 0.5 hPa. The sensor offers high temperature stability across its entire operating temperature and pressure ranges of 0 to 65° C and 700 to 1100 hPa respectively. Average temperature coefficient offset (TCO) is 0.6 Pa/K. Noise is 0.9 Pa typical, an improvement of 25 percent relative to its predecessor, BMP380.

Accurate altitude detection helps localize people indoors, where GPS signals are not available. The addition of vertical-specific position to existing horizontal information enables first responders to determine the floor level of smartphone users who trigger an emergency call.

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Flow Sensor with Bluetooth

AW-Lake Company (Oak Creek, WI) introduces the new EDGE Flow Sensor with optional Bluetooth for use in flow meter applications requiring an analog, pulse, or Modbus signal to a PLC or other control system. Easily mounted on meters, it outputs a frequency or analog signal, which gives users more installation flexibility, especially when unsure of readout equipment or a control room interface. With the ability to force the sensor to output a frequency or analog signal, connections to a user interface are verifiable without the need to run fluid flow.

Operators can configure, set parameters, fine-tune adjustments, and troubleshoot the sensor remotely using a mobile device. The mobile application also supports basic scaling and advanced functions, allowing for remote correction of nonlinear flow meters to maintain a linear analog output. Using the mobile application, users can turn a smart-phone or tablet into a wireless flow monitor.

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Humidity Resistant Strain Gage Sensors

The Micro-Measurements® brand of Vishay Precision Group, Inc. (Raleigh, NC) has introduced the CHA Series of humidity resistant strain gage sensors. The CHA Series offers better humidity performance compared with the CEA family, making it a good choice for the most demanding applications, such as humidity conditioned composite materials. Built to improve performance under ASTM-5229 “Standard Test Method Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials” test conditions, they are currently available in several uniaxial, tee rosette, and rectangular rosette configurations.

CHA features:

  • Cast polyimide backing for flexibility and toughness

  • Larger integral copper coated tabs for easier lead wire connection

  • Protective encapsulation film with enhanced moisture protection

  • Strain range: ±3% for all gage lengths, 5% for gage lengths of 0.250 inch or greater

  • Fatigue life: ±1500 microstrain for 106 cycles

  • Temperature range: –100° to +350°F (–75° to +175°C)

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Low Torque Sensor With 50kHz Bandwidth

The TorqSense ORT 230/240 low torque sensor from Saelig Company, Inc. (Fairpoint, NY) offers precise dynamic measurement of rotary and static torque from 10 mNm to 100 Nm for signal bandwidths up to 50kHz. It precisely measures bi-directional rotary or static torque and can be fitted with speed sensors for monitoring dynamic applications, enabling direct measurements of transmitted power. The ORT transducers require no external instrumentation and have their own built-in test capability. Their compact size makes them suited for use in applications where there is little space for extra equipment. Analog voltage outputs are standard, with current outputs available as an option. TorqView software, provided free, allows the ORT240 series to be connected to a PC via USB (optional) or RS232 so that configurations can be changed, and to display torque, speed, and power.

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Oil Dipstick Thermocouple Temperature Probe

Harold G. Schaevitz Industries LLC (Bloomfield Hills, MI) announces the new Oil Dipstick Thermocouple Temperature Probe. Made in the USA, it is intended for use in research & development applications to measure engine fluid temperatures. This flexible probe slides down the dipstick tube into the pan or reservoir and can be custom made to any length per the user’s specification. The probe’s compression fitting is adjustable, allowing the probe tip to be set at various depths.

Oil Dipstick Thermocouple Temperature Probe Features:

  • Available as Type J, K, or T thermocouple

  • Probe is flexible

  • Probe fitting is adjustable allowing for various tip depth settings

  • Ideal for engine oil, water, & transmission fluid temperature measurements

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Hermetically Sealed, Spring-Loaded LVDTs

NewTek Sensor Solutions (Pennsauken, NJ) introduces an extended family of spring-loaded LVDTs for highly accurate and repeatable dimensional gaging of components. Available in AC- and DC-operated versions, these sensors are used in R&D labs for quality testing, printing operations for roller alignment, and automated production lines for dimensional gaging of parts in go/no go inspection. Data collected by the probes can be used for online quality control and post-process statistical analysis.

Featuring a stainless-steel, spring-loaded probe assembly and welded ¾-inch diameter hermetically sealed housing, the sensors are available in ranges from ±0.050” (1.27mm) to ±2” (50.8mm). With near-infinite resolution and excellent repeatability, these gage heads operate at linearity of ±0.15% over wide operating temperature ranges of -65°F (-54°C) to 275°F (135°C).

The AC-operated LVDT can work in a hostile environment, while a signal conditioner provides power to the sensor and demodulates the output, which operates remotely in a benign area.

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MEMS Environmental Pressure Sensor

Bourns (Riverside, CA) announced the addition of four new model families to the Bourns® Precision Sensor (BPS) line. Based on state-of-the-art MEMS technology, the new sensors are cost-effective pressure sensor solutions that feature ultra-fast response times, high resolution, and long-term stability. They can work with pressure ranges from 5 to 500 psi, so they are useful for an array of packaging requirements and applications including industrial systems and low/medium risk medical devices.

The Model BPS310 series is designed to provide high sensitivity/accuracy for ultra-low pressures. For gauge and pressure measurement, the Model BPS320 series offers a robust configuration in a surface mount package. The Model BPS330 series is a through-hole pressure sensor with an aluminum port for low pressure applications with an operating range up to 125 °C. With an ability to handle certain harsh media, the Model BPS340 series is offered in a surface mount package capable of supporting pressure ranges up to 500 psi.

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Self-Contained Displacement Sensor

An off the shelf, self-contained analog output displacement sensor for high-precision, and high-repeatability applications has been introduced by The Measuring Division of Kaman Precision Products, Inc. (Middletown, CT).

The temperature of the SC-2440 sensor is continuously monitored, and the circuit provides a voltage output of 0.5 to 1.2 VDC from 0 to 70° C. This temperature-proportional voltage can be monitored by a microprocessor or PLC for active correction of the displacement output with changing temperature conditions. When used in precision automation applications, the output is as accurate at the beginning of the first shift on a cold January morning as it is at the end of the shift on a hot July afternoon.

Additional features of the SC-2440 system include self-contained electronics, submersible IP-67 rugged housing, built-in temperature sensor, fixed gain output, reverse polarity, and short circuit protection. The system also features extremely low hysteresis and performs well with ferrous targets.

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Electromagnetic Flowmeter

Endress+Hauser (Greenwood, IN) has launched its Promag W electromagnetic flow meter, featuring the “0 × DN full bore” option, a solution for a close-knit pipeline network or obstacles in pipes, which provides maximum measuring performance without tube restriction, and thus without pressure loss.

Promag W 300/400/500 flow meters have accuracy of ±0.5%, even directly downstream of pipe bends, T fittings, or insertion devices. They are particularly suitable for installation in tight spaces because they do not need any inlet or outlet runs. They can handle swirls that frequently occur downstream of obstacles such as pipe bends and insertion devices, and even those downstream of unknown obstacles such as build-up on the pipe wall, protruding seals or different inside diameters.

The meter uses multiple measuring electrodes to detect flow. These electrodes generate a substantially higher density of measured data than standard devices. Together with refined signal analysis, reliable measurement results are realized even in swirl conditions.

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Sensor Technology Magazine

This article first appeared in the June, 2020 issue of Sensor Technology Magazine.

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