SNAP 8-Ch Multifunction RTD/Resistance Analog Temperature Input Module

Price: $650.00
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    Availability: In Stock
    Usually ships In 24 - 48 hours

    Item #: SNAP-AIRTD-8U

    Description

    The SNAP-AIRTD-8U analog input module provides 8 input channels, each individually software configurable. This module is commonly used for 3-wire RTD temperature inputs but is also suited to high-resolution resistance measurements. It features open circuit detection if any wire breaks.

    You can individually configure each of the module's 8 points for a variety of behaviors, including a fixed temperature range for nickel, platinum, or copper RTD inputs; a fixed range in ohms; or two types of auto-ranging where the module scrolls within a range (in ohms) and chooses the best resolution.

    The SNAP-AIRTD-8U has a plug-in terminal on top with spring-clamp connectors for easy wiring. An insertion tool is provided in the box with the module.

    All 8 inputs share the same reference terminal. Make sure you use isolated RTD probes.

    The SNAP-AIRTD-8U requires a SNAP PAC brain or R-series controller with firmware R9.5a or higher. The module cannot be used with legacy brains or controllers.


    Specifications

    SNAP-AIRTD-8U

    3-wire RTD input and maximum temperature table range (actual range depends on your probe)

    1000 ohm platinum @ 0 °C α= 0.00385
    Range: -200 to 850 °C
    (-328 to 1,582 °F)

    100 ohm platinum @ 0 °C
    α= 0.00385
    Range: -200 °C to 850 °C
    (-328 to 1,582 °F)

    10 ohm copper @ 25 °C
    α= 0.00427
    Range: -60 to 355 °C
    (-76 to 671 °F)

    1000 ohm nickel @ 0 °C
    α= 0.00618
    Range: -60 to 170 °C
    (-76 to 356 °F)

    100 ohm nickel @ 0 °C
    α= 0.00618
    Range: -60 to 250 °C
    (-76 to 482 °F)

    1000 ohm nickel @ 70 °F
    α= 0.00637
    Range: -46 to 148.9 °C
    (-50 to 300 °F)

    120 ohm nickel @ 0 °C
    α= 0.00672
    Range: -80 to 260 °C
    (-112 to 500 °F)

    Input Range

    0 to 4000 ohms

    0 to 400 ohms

    0 to 40 ohms

    Accuracy
    From factory
    After setting gain and offset

    0.8 °C (Pt); 0.6 °C (Ni)
    0.6 °C (Pt); 0.4 °C (Ni)

    0.8 °C (Pt); 0.6 °C (Ni)
    0.6 °C (Pt); 0.4 °C (Ni)

    1.7 °C
    1.2 °C

    Excitation Current

    0.325 mA

    2 mA

    4.28 mA

    Over-Range Limit

    10% overrange for all measurements in ohms

    Resolution
    In Ohms
    In RTD Temperature

    The greater of: (Ohms Range / 100,000) or 1 milliohm

    Better than or equal to 0.05 °C (0.09 °F)

    Input Filtering
    Front end filtering
    DSP Notch filter

    -15 dB @ 50 Hz, -20 dB @ 60 Hz

    20 Hz (-3 DdB = 5.24 Hz)

    Data Freshness (Max)

    1.2 s

    Auto-range Settle Time

    Step change from 10 to 8000

    Step change from 8000 to 10

    1.2 s to the next higher or lower range

    <= 10 s ranging up (channel may show overrange until settled)

    <= 10 s ranging down (channel will give a reading while settling)

    Total Lead Resistance

    200 ohms maximum

    DC Common Mode Rejection

    >-120 dB

    AC Common Mode Rejection

    >-120 dB at 60 Hz

    Maximum Survivable Fault Voltage at Input (between any 2 field wires)

    ±8 V

    Maximum Operating Common Mode Voltage

    250 V field terminal to logic connector

    Isolation

    1500 V field side to logic side

    Power Requirements

    5.00 to 5.20 VDC @ 135 mA

    Operating Temperature

    -20 °C to 70 °C

    Storage Temperature

    -40 °C to 85 °C

    Humidity

    5-95%, non-condensing

    Maximum wire size

    20 AWG

    Torque, hold-down screws

    4 in-lb (0.45 N-m)

    Agency Approvals

    UL, CE, RoHS, DFARS

    Warranty

    Lifetime