Instrumentation Monthly Test | Measurement | Control
Improve product temperature accuracy with the SMT172 digital temperature sensors from MMS Electronics Ltd. The SMT172 sensor provides clinical-grade temperature measurement accuracy (0.1°C) with fast response time to temperature changes. The SMT172 is a digital ultra-low power, factory calibrated, high accuracy temperature sensor with pulse width modulated output signal. PWM output sensors have high noise immunity <0.002 ºC. Easy to interface and measure on PCB or at spot when extending cable length. Duty cycle output is proportional to the measured temperature. Inaccuracy of the T018 package sensor is ±0.1 ºC between -20ºC to 60ºC, ±0.25 ºC between -10ºC to 100ºC. Max temperature +130ºC. Supply voltage 2.7V to 5.5V. This is the most energy efficient temperature sensor with an average current of < 60µA or 220nA based on 1 measurement per second. Consuming less power than PT100 sensors and easier to interface than RTDs. The ultralow power consumption also minimises the self-heating effect.
The SMT172 sensor is designed using the most recent advances in silicon temperature sensing, sophisticated IC design techniques are applied with high-precision calibration methods. The pulse width modulated output is proportional to the measured temperature value. A measurement of eight consecutive pulses or multiples of 8 is recommended. There may be a variation between each pulse but the average is very precise and stable. A simple calculation of the duty cycle returns the sensor temperature. Only one input pin on a microprocessor is required to connect to the SMT172 sensor. No analogue circuits or analogue to digital converter is required, reducing design complexity, power consumption and system cost.
MMS Electronics Ltd has the SMT172 sensor available in TO18, TO92, TO220, SOT223, SOIC-8 and a 7mm robust stainless steel probe with 5 meter cable. The wide range of packages allows the designer to pick a sensor suited to the application. Application are found in biotechnology, medical, humidifiers, dialysis, sterilizers, wearables, IOT, refrigerators, freezers, solar panels, heat pumps.
The SMT172 temperature sensor presents the temperature data in the frequency domain. Sensors that work in the frequency domain have many advantages in comparison with analogue output sensors namely: a high noise immunity, high reference accuracy, wide dynamic range, simplicity of coding, multiplexing and interface.
Most frequency-to-digital conversion are usually performed by a low-cost microcontroller, but when very accurate measurements over a wide dynamic frequency range are required these bring design problems. To overcome these problems MMS Electronics supplies the UFDC-1, UFDC-1M-16 and USTI fully digital frequency-to-digital converters for use with any sensor or transducer with a frequency, period, duty-cycle, interval, PWM , phase shift or pulse number output. The frequency converters are perfectly suited to any applications where frequency-time parameters need to be measured with highest resolution and programmable accuracy. 16 programmable modes to measuring frequency, period, duty-cycle, pulse, count or rpm. The relative error, non-redundant conversion time and accuracy (1 to 0.0005%) is programmable. RS232, SPI and I2C interface.
MMS Electronics Ltd is introducing a new compact PLC series from DISPLAY VISIONS. These innovative controllers are designed to be particularly communicative, the central control unit already has a colour touchscreen display integrated and can address up to 50 remote satellite displays. This makes these PLCs ideal for a wide range of AV, home and industrial applications, where it is important to be able to visualize process data, enter parameter data, and control the system from multiple locations. The PLC central control unit, “PLC-Core”, is simple to use and displays your measurement and process data on a brilliant 2.8 inch IPS display with a PCAP touch panel to enter control commands and parameters. The PLC-Core is networked with the satellite display units automatically. For this, the PLC-Core has Ethernet capabilities and an RS-485 interface, it can also communicate wirelessly via Wi-Fi.
The core has eight digital inputs, 4 analogue inputs (4-20 mA and 0-10 V) and 4 relay outputs. Depending on the complexity of the input and output data, satellites with different display sizes are available, from a 1.5″ display to the 10.1″ panel. The measurement values and parameters are updated automatically. The satellites automatically synchronise with the core in real time and are individually configurable. All touch and display functions are programmed with the free Windows tool “PLC Designer”. Various housings are available for the satellite terminals EA PLCS043-DS.
MMS Electronics Ltd is based in Leeds and is the authorised UK distributor and stockist for the 2,000 plus display products from Display Visions GmbH. Call us about your application and learn how these innovative controllers can be used. Sample orders for the sensors and displays can be placed directly from the MMS Electronics web shop.
MMS Electronics Ltd
Tel 01943.877668
