ISM™ sensors help you sustain process consistency because they provide extremely reliable measurements and tell you when maintenance will be required - giving you more confidence in your processes.
Juan de Dios Tecalco, Superintendent, Piasa Group, Mexico
ISM sensors utilize METTLER TOLEDO’s decades long expertise in process analytics sensor technology to ensure the highest measurement accuracy, regardless of how challenging the process conditions are. Once measured, the sensors' interference-prone analog signal is converted to a robust digital signal before being sent to the connected transmitter.
Built-in health monitoring in ISM sensors mean you always know if they are measuring reliably.
The combination of leading-edge sensor technology and health monitoring ensures you can always fully rely on the measurements from ISM sensors.
This video explains why ISM sensors provide more reliable measurements than other analytical sensor technologies:
Analog sensors output a sensitive signal that’s easily affected by the surrounding environment. Inside ISM sensors, the analog signal is converted to a robust digital signal. Being digital, the signal is unaffected by nearby equipment, long cable lengths, or moisture in the environment.
Regardless of how tough your process conditions might be, you need analytical sensors that enable you to run your production efficiently and smoothly. That’s why our wide range of ISM sensors are designed with features that allow them to better endure challenging environments than other sensors.
Unexpected sensor failure or erratic measurements can be huge problems. The built-in health monitoring of ISM high precision sensors uses past and present data to predict exactly when a sensor will need to be calibrated or replaced, so you can fully rely on every measurement.
.png/_jcr_content/renditions/cq5dam.web.1280.1280.png "ISM pH Sensors")
.png/_jcr_content/renditions/cq5dam.web.240.240.webp "Transmitters")
To achieve process consistency, you need accurate and reliable sensors. Measurements from ISM sensors are very accurate because they use a measurement technology which better endures challenging processes. Measurements are calculated directly in the sensor and transmitted digitally, eliminating any losses caused by interference or long cables. Further, diagnostics in the sensor inform operators of a sensor’s need for maintenance. If a sensor requires maintenance, it can be exchanged for another that does not. Therefore, sensor reliability can remain very high.
Typically, analytical sensors output a weak, analog signal. Interference of the signal caused by nearby electromagnetic fields (e.g., from motors) and humidity in the environment can alter the signal or cause it to fluctuate. Also, transmitting the signal over long cables can lead to it being degraded and unreliable. Analytical sensors that output a digital signal are not affected by electromagnetic fields, moisture, or cable length.
Extremes of pressure, temperature, pH as well as conditions such a high percentage of solids in the medium can impact analytical sensors, leading to the need for frequent maintenance to restore measurement accuracy and also reduced sensor life.
For analog pH sensors it can be problematic to tell if a sensor is working correctly. However, there are various indications that a pH sensor is not operating as it should, e.g., slow response time, high membrane resistance, small slope, and large offset. ISM pH sensors continuously monitor their condition and predict how many days remain until maintenance, to restore correct operation, will be due. If maintenance is not required, you can be confident that an ISM sensor is working reliably.
