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Home Solutions Fiber Optic Sensors for Microwave Digestion Instrument

Microwave heating is very popular for quick and selective digestion of materials in various industries e.g. Food and feed, Pharmaceutical, Chemistry, Environmental, etc. In these application, the sample is mixed into an acid mixture and heated to high temperature, up to 250 or 300⁰C. However, spontaneous heating of acid mixture induces exothermic reaction resulting into very rapid change in temperature and pressure.

Therefore, faster and accurate monitoring of temperature and pressure is crucial in minimizing safety risks. Fiber optic sensors for temperature and pressure measurement have been widely successful in microwave assisted digestion applications due their immunity to electro magnetic field within the microwaves.

 Vessel temperature monitoring increases safety of digestion operation
• Increases lifetime of digestion vessel by direct temperature monitoring
• Programmable temperature limits for starting cooling operation
• Close observations, recording and reporting
• Sample temperature monitoring for highly accurate research analysis
• Precise and automatic sample temperature control


Benefits of Fiber Optic Temperature Sensors

    1. Faster Reaction Time
    The measuring speed of the sensor is extremely important for controlling exothermic reactions effectively. The in-situ Fiber optic temperature sensors provide fastest response time (within 0.1s) in detecting temperature change.

    2. Direct and Accurate Measurement
    Direct contact with vessels and sample ensures efficient and safe control of the digestion process. It also helps in analyzing different vessel's reaction for consistency and detecting any abnormality.

    3. Immunity to Microwaves and EMI Fields
    Immunity to microwave and EMI fields helps in using Fiber Optic temperature sensors without any bulky shielding (as it would be required in case of thermocouples). Bulky shielding always introduces delay and inaccuracy in measurements.

    4. No Contamination to Digestion Sample
    Fiber optic temperature sensors bounded with PTFE material never pose a risk of contaminating digestion sample and leading to failure of experiment or safety measures.

    5. Corrosion Resistant
    Corrosion from the sensor coating / shielding always have risk of failing experiments. Fiber optic temperature sensors are bounded by PTFE, the same material that is used for making vessel caps. Therefore no risk of corrosion.

    6. Pressure Neutral Temperature Measurement
    GaAs (Gallium Arsenide) based Fiber Optic temperature sensors are not impacted by pressure and provide similar accuracy in high pressure and low pressure environment. Ideal for pressure digestion applications.

    7. Ease of Handling (Plug and Play)
    Fiber optic temperature sensors do not need any special mounting requirements and can be mounted at tiny spaces. These sensors do not require complex calibration and can be reused in different applications.


    We provide range of fiber optic temperature sensors, monitors and accessories to microwave manufacturers for digestion applications. Fiber optic sensors and monitors are being used during the product testing of microwaves and installed into microwaves for temperature monitoring during the digestion process. 

    Our solution is capable of monitoring variety of microwave digestion applications ranging from one sensor per microwave (in the reference vessel) to large quantity of sensors (up to 256 sensors) for independent vessel and sample monitoring.

    microwave RELATED PRODUCTS
    Measurement Range-80 °C to +300 °C (cryogenic 4 °K range optional)
    Measurement range (Optional Range extensions)Down to 4 °K / Up to +300 °C
    Accuracy±1.0 °C (+/- 0.2 °C in relative temperature)
    Number of Channels1 - 8 Channels
    USB (to use with Rugged connect windows software)1 sec interval on USB / Micro SD card
    Config portUSB (to use with Rugged connect windows software)
    Measurement Range-80 °C to +300 °C (cryogenic 4 °K range optional)
    Resolution0.1 °C
    Accuracy±1.0 °C (±0.2 °C in relative temperature)
    Scan Rate200 ms / channel ( Optional: Faster scanning rates available)
    Number of Channels2, 4, 6 and 8 channels
    Serail PortRS485 with Modbus support
    CANBUS PortCANBUS Master/Slave support for CAN Dataloggers
    Temperature range-200 °C to +250 °C
    Temperature range (Optional Range extensions) RepeatabilityDown to 4 °K / Up to +300 °C
    Repeatability0.2 °C
    Accuracy absolute temperature+/- 0.8 °C
    Accuracy relative temperature+/- 0.2 °C
    Probe sheathing materialTeflon Coated
    ConnectorStainless Alloy / Optional - Dielectric
    Temperature range-200 °C to +250 °C
    Temperature range (Optional Range extensions) Down to 4 °K / Up to +300 °C
    Repeatability0.2 °C
    Accuracy absolute temperature+/- 0.8 °C
    Accuracy relative temperature+/- 0.2 °C
    Probe sheathing materialTeflon Coated, with Polyimide protection for sensor tip
    ConnectorStainless Alloy / Optional - Dielectric



    Rugged connect provides remote visualization of temperature and other data being measured / monitored by various rugged monitoring systems. The software can connect to multiple monitoring devices for data collection and advance visualization. The intuitive user interface of the software is designed to give quick access to the most relevant information with highest level of data security.

    •  Cyber Security
    •  Real-time Data
    •  Data Logging
    •  Health Check

    Extension Cables

    Fiber Optic extension cables for applications where test equipment are very far from test object


    Fiber Optic Cable connectors (Metal and Dielectric) to connect two Fiber Optic and Extension cables

    Terminal rings

    Terminal rings for fiber optic probe tip mounting for places like cable terminals, battery etc.

    Disposable Tip

    Disposable Dielectric Tip that allows Fiber Optic sensors to be reused

    Quantity with Comments 1 (for each Vessel) 1 (for each Sample) Multi-Channel (up to 08 in one board) OEM Module - O201 Multi-Channel (up to 08 in one board) Monitor - L201 Multi-Channel (up to 256 sensors) Monitor - R501 01 (for each sensor)
    Equipment (System Component) FO Temperature Sensors on the vessel surface FO Temperature Sensors for Sample temperature FO Temperature Monitor (to fit with Temperature control electronics) FO Temperature Monitor (independent temperature monitoring during microwave development) FO Temperature Monitor for applications that require to monitor large number of temperature points (up to 256) Accessories: V-Pin Crimp and Cleave connector