• WTW-472103-DIQS281-front-pH_screen.jpg
  • WTW-472103-DIQS281-front-Cond_screen.jpg

Universal monitor DIQ/S 281-CR2 - WTW

  • SKU: 472103
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  • Description

    Universal monitor DIQ/S 281-CR2. The new system 281 – the digital and cost-efficient single parameter measuring point with proven IQ Sensor Net technology and IQ sensors for the standard parameters. Low-cost alternative to analog measuring points

    The System 281 combines the known performance of analog products with the advantages of the digital IQ Sensor Net:

    • Proven and reliable IQ Sensor Net technology
    • 100 % IQ Sensor Net look & feel
    • 2 mA for main and secondary parameter
    • 2 relays for alarm for main and secondary value
    • You can easily upgrade to DIQ/S 282/284, since IQ sensors can be retained
    • Free software updates with new features
    • Matching digital IQ sensors for pH/ORP, conductivity, O2 and turbidity
    • Stable, robust and proven measuring technology

    With the system 281, WTW offers a digital and cost-effective alternative to analog measuring points. Our IQ sensors (also as seawater version) are available for the parameters pH/redox, conductivity, oxygen or turbidity.

    You will receive a cost-effective measuring point with proven WTW IQ Sensor Net technology. In addition to the power supply via a wide range power supply (100-240VAC) or via 24 V, 2 current outputs and 2 relays are also available.

  • Specifications

    Max. number of sensors


    IQ Sensor Net connections



    2 x (0) 4 ... 20 mA, 2 x Relays


    Graphic TFT Display; Resolution: 320 x 240 pixel; backlit

    Control Functions/
    Function Keys

    5 operating keys: measurement (M), calibration (C), set/system settings (S),
    3 master keys for functions:
    2 keys for: confirmation/switching menu O.K. (OK), escape (ESC)
    Arrow keys for rapid selection of software functions and input of alpha-numeric values (up), (down)

    Electric Supply

    100 … 240 VAC (50/60 Hz), 24 V AC/DC

    DIQ Modules

    DIQ/JB and DIQ/CHV

    Cable Feeds

    4 screw cable glands M 16 x 1.5 (expansible to M 20 if required)

    Terminal Connections

    Screw terminal strips; Terminal area for solid conductors: 0.2 ... 4.0 mm2
    Terminal area for flexible conductors: 0.2 ... 2.5 mm2; accessible by opening cover

    USB interface

    USB-A for software updates

    Ambient Conditions

    Operating temperature: -4 °F … 131 °F (-20 °C … +55 °C); Storage temperature: -13 °F … 149 °F (-25 °C … +65 °C)

    Housing Material

    PC – 20 % GF (polycarbonate with 20 % fiberglass)

    Protection Rating

    IP 67 / corresponding to NEMA 4X (not for direct conduit connections). Conduits need to be connected with flexible adapters (CC-Box), respectively with adapters CC-PM..

    Dimensions (W x H x D)

    144 x 144 x 125 mm (5.67 x 5.67 x 4.92 in.)


    Approx. 1,2 kg (2.6 pounds)



    Electromagnetic Compatibility

    EN 61326-1, Class A; FCC Class A

    Integrated Overvoltage Protection

    According to EN 61326-1 enhanced overvoltage protection for the entire system

    Connection Medium Cable

    IQ Sensor Net cable SNCIQ or SNCIQ/UG (underground cable with additional PVC coating): 2-wire with shield; 2 x 0.75 mm2; filler cord for easy connection of shield: 0.75 mm2; pressure resistant to 10 bar

    Connection Characteristics

    Power supply and data transmission on these wires; resistant to polarity reversal with respect to switched shield and inner conductor (no damage); comprehensive EMC shield control; Cable topology within the IQ Sensor Net system as required, e.g. in the form of a line, tree, star; total cable length max. 250 m (273 yds)


    3 years for defects of quality


DIQ/S 281 (English)

DIQ/S 281
Universal transmitter for one digital sensor
Operating manual 

IQ SENSOR NET System 281

Titelseite of WTW's Flyer zum System 281Flyer, 4 pages, German, 999148D
"Das System 281: für pH/Redox, Gelöst-Sauerstoff, Trübung oder Leitfähigkeit - einfach, digital, modern"

IQ SENSOR NET System 281

Cover English Product Flyer of WTW's IQ SENSOR NET System 281Flyer, 4 pages, English, 999148US
"The System 281: for pH/ORP, Dissolved Oxygen, Turbidity or Conductivity - simple, digital, modern"

IQ SENSOR NET System 281

Datasheet D1.09, German, 999215D
for IQ Sensor Net System 281

IQ SENSOR NET System 281

Datasheet D1.09, English, 999215US
for IQ Sensor Net System 281

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