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    St420 Users Manual Rev D

    Uploaded by

    Sherif M. Dabour
    The ST420 is a shaft speed sensor that outputs a 4-20mA analog signal proportional to rotating shaft speed. It detects magnetic pulses from a pulser target mounted on the shaft. The sensor housing contains magnetic pulse detection, signal processing, and 4-20mA circuitry. It is intrinsically safe for use in hazardous environments. The sensor mounts with a 1/4" gap from the pulser target and has a 10ft cable. It provides a smooth analog output between 2-2000rpm or 2-200rpm, depending on the model.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    St420 Users Manual Rev D

    Uploaded by

    Sherif M. Dabour
    204 views4 pages
    The ST420 is a shaft speed sensor that outputs a 4-20mA analog signal proportional to rotating shaft speed. It detects magnetic pulses from a pulser target mounted on the shaft. The sensor housing contains magnetic pulse detection, signal processing, and 4-20mA circuitry. It is intrinsically safe for use in hazardous environments. The sensor mounts with a 1/4" gap from the pulser target and has a 10ft cable. It provides a smooth analog output between 2-2000rpm or 2-200rpm, depending on the model.

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    Original Title

    St420 Users Manual Rev d

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    The ST420 is a shaft speed sensor that outputs a 4-20mA analog signal proportional to rotating shaft speed. It detects magnetic pulses from a pulser target mounted on the shaft. The sensor housing contains magnetic pulse detection, signal processing, and 4-20mA circuitry. It is intrinsically safe for use in hazardous environments. The sensor mounts with a 1/4" gap from the pulser target and has a 10ft cable. It provides a smooth analog output between 2-2000rpm or 2-200rpm, depending on the model.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    204 views4 pages

    St420 Users Manual Rev D

    Uploaded by

    Sherif M. Dabour
    The ST420 is a shaft speed sensor that outputs a 4-20mA analog signal proportional to rotating shaft speed. It detects magnetic pulses from a pulser target mounted on the shaft. The sensor housing contains magnetic pulse detection, signal processing, and 4-20mA circuitry. It is intrinsically safe for use in hazardous environments. The sensor mounts with a 1/4" gap from the pulser target and has a 10ft cable. It provides a smooth analog output between 2-2000rpm or 2-200rpm, depending on the model.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    ST420

    4-20mA
    Shaft Tachometer Sensor/Transmitter

    USERS MANUAL
    (with I.S. control drawing)

    Description

    The ST420 is an analog-output shaft speed sensor/transmitter. It detects magnetic


    pulses from a rotating shaft-mounted pulser target (disc or wrap) and outputs a
    smooth, continuous 4-20mA analog signal in direct proportion to the pulse frequency
    (rotating shaft speed). See the Output Function graph on p. 4.
    The ST420 combines a magnetic pulse detector, signal processing and 2-wire looppowered 4-20mA circuitry into a stainless-steel M18x1 sensor housing.

    Installation

    Mount the pulser target (disc or wrap) to the shaft.


    Mount the ST420 with the arrow label aligned with the center path of the pulser
    target magnets as shown. Adjust the gap (A) to inch (6.35 mm).

    With Pulser Disc

    With Pulser Wrap

    Wiring Diagram (non I.S.)

    I.S. Control Drawing


    Entity Parameters

    Vmax
    Imax
    Pmax
    Ci
    Li

    30 Vdc
    100mA
    0.75 W
    0.3 uF
    0 uH

    Wiring Diagram (I.S.)

    I.S. Requirements

    Equip
    Vmax
    I max
    Pmax
    Ci + Cc

    Barrier
    Voc
    Isc
    Po
    Ca

    Notes

    Voc is the barrier max open-circuit voltage


    Isc is the barrier max short-circuit current
    If Po is not known, use Po = (Voc * Isc)/4
    Cc = (cable pF/ft) * length (in ft),
    Ca is the barrier max allowed external capacitance
    Li + Lc
    La
    Lc = (cable H/ft) * length (in ft),
    La is the barrier max allowed external inductance
    Selected barriers must be third party approved as providing intrinsically safe circuits for the
    application.
    The transmitter-barrier cable length is limited by the Cc, Lc restrictions given above.
    If the cable pF/ft and/or H/ft values are unknown, use 60 pF/ft and/or 0.2H/ft.
    The DIN rail (I.S. Ground) must be insulated from the surrounding cabinet (and all other potentials)
    and connected to earth ground at the 24V supply only. See NEC Article 504, CEC Section 18.
    Barrier output current must be limited by a resistor such that the output voltage-current plot is a
    straight line drawn between open-circuit voltage and short-circuit current.
    Barriers must be installed in accordance with barrier manufacturers control drawing and Article 504
    of the National Electrical Code, ANSI/NFPA 70, for installation in the United States, or Section 18 of
    the Canadian Electrical Code for installations in Canada.
    When required by the manufacturers control drawing, the barrier must be connected to a suitable
    ground electrode per the National Electrical Code, ANSI/NFPA 70 or the Canadian Electrical Code,
    as applicable. The resistance of the ground path must be less than 1 ohm.
    Control equipment must not use or generate more than 250 V rms or dc with respect to earth.
    Warning:
    Substitution of components may impair intrinsic safety.
    Warning:
    To prevent ignition of flammable or combustible atmospheres, read, understand and
    adhere to the manufacturers procedures.

    Specifications

    Sensor Gap
    Vin (min max)
    Operating Temp
    Accuracy
    Output response time

    1/4 in 1/8 in
    8 30 Vdc (nominal loop power: 24Vdc)
    -20 80 C
    Max error at 25C
    0.25%
    Max error over temp 0.50%
    < 9 mS

    Cable

    Type
    Length
    Color code

    Alpha 5092C (shielded, 2 x 24 (7/32) AWG)


    10 ft
    Brown (V+), Black (V-)

    Protection

    Intrinsically safe for use in Class I (Grp C,D), Class II (Grp E,F,G)

    Reverse-wiring protected.
    Dimensions

    80 mm (3.15 in) long, 18 mm (0.71 in) diameter

    Output Function

    I(f) = 4mA + 16mA*(f fmin)/(fmax - fmin)

    Models/p.n.
    Model
    ST420-H
    ST420-L
    ST420-C-XXXX
    Notes

    fmin fmax
    p.n.
    ppr rpm range @ ppr
    800-001601 0.267 266.7 Hz 8
    2 2000
    800-001600 0.267 26.67 Hz 8
    2 200
    800-0016XX
    Specified by customer

    rpm = f * 60/ppr
    ppr is the number of disc/wrap pulses-per-revolution.
    The ST420 detects each passing magnet as a pulse, regardless of north/south
    polarity. The ST420 PPR must be matched to the number of magnets in the
    disc/wrap.
    Custom ppr and frequency range ST420 models may be ordered consult factory.

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