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    Digital Pressure Transducer 5 PSI/30 PSI/100 PSI/3000 PSI/8000 PSI

    5 out of 5 based on 5 reviews | Write a review
    Digital pressure transducer with classic 2088 type head has high accuracy of 0.5%FS, medium temperature of -40~+60℃ (-40~+140℉) and optional measuring range -0.1~60MPa/ -1~600bar/ -14~8702psi. Pressure transducer is used for gauge pressure/absolute pressure/sealed pressure measurement of air, water, oil, etc. The output signal can be 4-20mA or RS485.
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    Delivery date: 6-12 days

    Digital pressure transducer for air/water/oil pressure measurement has optional output signal 4-20mA or RS485.

    Application: Pressure transducer is widely used in process control, chemical, petroleum and metallurgical industry and other fields.


    Model ATO-PRES-PX400
    Weight 1.6kg
    Measuring range * -0.1~60MPa (-1~600bar/-14~8702psi)
    Pressure type Gauge pressure (standard)
    Contact us for absolute pressure, sealed pressure type (note that the measuring range for these two types must ≤1MPa)
    Measure medium Air, water, oil
    Power supply * DC 12V, DC 24V, DC 12-36V
    Output signal * 4-20mA, RS485
    Accuracy * ±0.5%FS, ±0.3%FS
    Zero temperature drift ±0.03%FS/℃
    Sensitivity temperature drift ±0.03%FS/℃
    Long term stability ≤0.2%FS/year
    Overload pressure 200%FS
    Frequency response (-3dB) 5kHz~650kHz
    Thread of pressure connection * G1/4, G1/2, 1/4NPT, 1/2NPT, M14*1.5, M20*1.5
    Response time <10ms
    Operating temperature -40~+80℃ (-40~+176℉)
    Medium temperature -40~+60℃ (-40~+140℉)
    Material Housing: 304 stainless steel
    Fill fluid: silicon oil
    Pressure port: 304 stainless steel, or 316L stainless steel (customizable)
    Separating diaphragm: 304 stainless steel, or 316L stainless steel (customizable)
    Protection class IP67

    Note: * denotes optional parameters, you can select every parameter in drop-down lists to finish your order.

    Digital pressure transducer dimension drawing (unit: mm):
    Digital pressure transducer dimensional drawing
    Pressure transducer wiring diagram:
    Pressure transducer wiring drawing

    RS485 output wiring diagram

    Pressure transducer rs485 output wiring

    Note: For the output signal RS485, it is only a 485 communication protocol, if you need the data to be received from the PC through the RS485 port, then the PC used should be a PC for industrial application, which can support 485 communication function (such as touch screen HMI upper computer, etc.), A USB to 485 communication interface is also needed to connect the sensor to the PC.

    Tips: Why the pressure transducer has no output?

    1. When the pressure transducer is used with a display instrument, if there's no display on the instrument, it should be judged first whether the pressure sensor has no output or the display instrument is faulty. Measure the output of analog pressure transducer with a multimeter to see if it has a current output of 4-20mA. If the pressure transducer is used with a signal isolator and DCS, it can be judged by measuring the current with a multimeter.
    2. If the pressure transducer doesn't have output, check firstly whether the 24V power supply is normal. If the 24V power supply and power supply are normal, but the pressure transducer still has no output, check whether the power cord is connected reversely, whether the positive and negative poles of the signal are connected incorrectly. If they are, check whether there are open circuit faults in the whole circuit.
    3. If all above inspections are normal, the hardware of the pressure transducer may break. If the circuit board of pressure transducer is damaged, it directly leads to no current output. Overload or over-voltage of the pressure transducer will also lead to damage of its measuring component, which may also lead to no current output; Damage of the transducer's gauge outfit would also lead to no current output. Short-circuit the gauge outfit directly with two wires and it will be normal after short-circuit, indicating that the gauge outfit is damaged. If the LCD head has no display, check the LCD board first, and then check the circuit board. If there's still no output, check the EMI board and circuit board.

    Measuring range conversion table:

    Unit kPa MPa bar psi
    Measuring range 0~5 0~0.005 0~0.05 0~0.7
    0~10 0~0.01 0~0.1 0~1.5
    0~20 0~0.02 0~0.2 0~3
    0~50 0~0.05 0~0.5 0~7
    0~100 0~0.1 0~1 0~14
    -100~0 -0.1~0 -1~0 -14~0
    -100~100 -0.1~0.1 -1~1 -14~14
    0~600 0~0.6 0~6 0~87
    0~1000 0~1 0~10 0~145
    0~1600 0~1.6 0~16 0~232
    0~2500 0~2.5 0~25 0~362
    0~6000 0~6 0~60 0~870
    0~10000 0~10 0~100 0~1450
    0~20000 0~20 0~200 0~2900
    0~30000 0~30 0~300 0~4351
    0~40000 0~40 0~400 0~5801
    0~50000 0~50 0~500 0~7252
    0~60000 0~60 0~600 0~8702
    0~100000 0~100 0~1000 0~14503

    Existing reviews of Digital Pressure Transducer 5 PSI/30 PSI/100 PSI/3000 PSI/8000 PSI
    Problem about pressure transducer
    The VFD runs the pump just fine from zero to 60hz. The problem is the pump never stops or slows down and the pressure gauge switches between 3.01 PSI and 4.206mA. Pressure gauges in the home are reaching critical at 130 plus psi so I know the pressure gauge is not reading pressure.
    I took current readings at 60hz with both a digital and analog meter. DC mA shows zero but when I switch to AC mA, I get the attached readings. Current remains the same from 0-60hz until pump is powered down then goes to zero.
    Well the troubleshooting is over. The pressure gauge you sent me is defective. I replaced with one I purchased off of Amazon and it’s working perfectly. See attached photos.
    Running about 44hz with each zone of the irrigation system.
    Do you want me to return for a refund or do you want to exchange it?
    The only thing I don’t have figured out is hibernation and sleep modes when pump has reached desired pressure but there is no flow.. I can start the VFD and it runs up to 30HZ and it stays there until I open a valve to allow some water flow. Then it runs up to about 44hz and stays there even after reaching full pressure at .52. It remains at 44HZ even after the valve is closed with no flow. The VFD does not hibernate or go to sleep.
    I’m using these settings. Any suggested changes?
    From: adler | Date: 06/04/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    1. Since you have purchased a new pressure sensor, we agree to refund you the faulty pressure sensor.
    2. Regarding hibernation and sleep modes, this is because there is no pressure difference when you set the pressure parameters. Assuming that the target pressure you set is P705=0.52, then the VFD will enter the sleep mode when the pressure slowly decreases to the sleep pressure, so P7.20 should be set to 0.4, and P7.19=0.35.
    In other words, there should be a pressure difference between the target pressure level, the sleeping pressure level, and the waking pressure level. The above pressure bits can not be set to the same value, otherwise it will not automatically adjust and change as you do now.
    How to connect a pressure sensor?
    Thank you can you point me to the correct cable for connecting the vfd, how do I vfd to connect to an ato-pres-px400 pressure sensor with 4-20 mA output?
    From: Joseph | Date: 03/03/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The pressure sensor ato-pres-px400 you bought has a power supply voltage of 24VDC and an output signal of 4-20ma. So you need to use a 4-core cable (it is better if there is a shielded cable), 2 wires are used to connect to the 24V power supply, and 2 wires are used to connect the output signal 4-20ma. The diameter specification of the 4-core control signal wire is 0.5-0.75mm².
    I see this sensor has rs485 capabilities. Can it also talk modbus over this?  How can I read pressure information?
    From: Greg | Date: 24/02/2022
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes, it  complies with the MODBUS communication protocol and adopts the subset RTU
    mode and RS485 half-duplex working mode in the MODBUS protocol. And if you want more information,  you can click the link
    Questions about pressure sensors
    I want to ask you can I connect the pressure sensor output RS485 directly with pc by used cable RS485 converter, also can I connect 4 sensors to the computer at the same time?
    From: Yannis | Date: 20/12/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Yes. First, all four sensors and PC (such as touch screens) must support RS485 communication protocol.
    -0.1MPa ~ 0.1MPa Digital Pressure Transducer
    I specially come to write a review after the completion of the system test. I bought a digital pressure transducer with measuring range of -0.1MPa ~ 0.1MPa. The pressure transducer has very good stability and quality. I install it near a 55kW fan VFD, and I don't use the shielded wire. The digital pressure transducer is still not disturbed.
    From: Hayden | Date: 07/08/2019
    Was this review helpful? Yes No (0/0)
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