Thermo Scientific™ Orion™ 261S Basic Waterproof Portable pH Meter

Measure pH, mV and temperature using the Thermo Scientific™ Orion™ 261S Intrinsically Safe (US) Portable pH Meter

Manufacturer: Thermo Scientific™ 0261S2

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Catalog No. 13-650-112


This item has been discontinued by the manufacturer and is no longer available. Please call customer service for assistance: 1-800-766-7000. 


    Warranty 3 year meter warranty
    Calibration pH
    Temperature Selection Automatic with ATC temperature probe
    Model Orion Intrinsically Safe 261S pH/mV/Temperature Portable Meter
    Channels 1
    Keypad Measure, cal, scroll up, scroll down, power keys
    Measurement Modes pH with mV and temperature
    Item Description Orion Intrinsically Safe 261S pH portable meter
    Languages English
    Outputs None
    Power Supply 3 AA batteries (included)
    Dimensions (L x W x H) 16cm x 13.3cm x 3cm (6.30 in. x 5.24 in. x 1.18 in.)
    Weight (English) 1.4 lb.
    Weight (Metric) 0.6kg
    Backlight Option None
    Resolution (mV) 0.1mV
    Resolution (Temperature) 0.1°C
    Inputs E-DIN Waterproof (pH electrode), banana plug (ATC temperature probe)
    Probe Type pH electrode, ATC temperature probe (purchase separately)
    Battery Life 1000 hours
    Range (pH) -2.00 to 16.00pH
    Resolution (pH) 0.1, 0.01pH
    Range (Temperature) -20° to 120 °C, -4° to 248° F
    Accuracy (Temperature) ±0.3°C
    Display Type LCD
    Battery Type Three AA (included)
    IP Rating IP-66
    Temperature (Metric) Operating -10° to 55°C (ambient)
    Accuracy (pH) ±0.01pH
    Description Orion Intrinsically Safe 261S pH portable meter
    Accuracy (mV) 0.1% of reading ±0.3 mV
    Calibration Points (pH) 1 to 3
    Includes Orion 261S pH meter, 3 AA batteries
    Certifications/Compliance CE, FM (IS, Class I Div 1 Group A, B, C, D, T4), Ex (Intrinsically Safe)
    Temperature (English) Operating 14° to 131°F (ambient)
    Range (mV) ±1300.0mV

    Measure pH, mV and temperature in environments where non-sparking equipment is required using the Thermo Scientific™ Orion™ 261S Intrinsically Safe (US) Portable pH Meter. Intrinsically safe approval rating by Factory Mutual (FM) for US only.


    • 2.00 to 16.00pH range
    • -20° to +120° temperature range
    • ±1300mV range
    • Safely measure in hazardous and confined space environments and anywhere nonsparking equipment is desired
    • Battery-operated
    • Large, easy-to-read display to monitor electrode condition, calibration status and pH, mV and temperature readings
    • Automatic or manual calibration with up to three calibration points


    • Meter Only package includes meter, built-in quiver, neckstrap and instruction manual
    • Meter/Electrode package includes meter, Triode™ 3-in-1 Combination pH Electrode, built-in quiver, neckstrapand instruction manual
    • Meter Field Kit package includes meter, built-in quiver, neckstrapand instruction manual, case, stand, electrode holder, beakers, 4, 7, 10 buffers, RS232 cable and software

  • Description & Specifications

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