The provided document is an operation manual for the SMC Digital Flow Switch, model PF3W7##.
Function Description
The SMC Digital Flow Switch is designed to detect and display fluid flow, offering various switch functions and output modes. It can measure the instantaneous flow rate of water and ethylene glycol solutions. Certain models also incorporate a temperature sensor to detect fluid temperature.
The device operates in a measurement mode where it detects and displays the flow, and the switch function is active. This is the basic operating mode, with other modes available for setting parameters and functions.
Key functions include:
- Flow Measurement: Detects and displays the instantaneous flow rate.
- Switch Output: Provides ON/OFF signals based on set flow values. It supports hysteresis mode (output turns ON when flow exceeds a set value and OFF when it falls below the set value minus hysteresis) and window comparator mode (output turns ON within a set flow range).
- Accumulated Flow Output: Generates a pulse every time a predefined accumulated flow passes, allowing for total accumulated flow calculation. It also supports accumulated increment and decrement modes, where the output turns ON when a set accumulated value is reached (increment) or when the value decreases to zero (decrement).
- Analog Output: Provides a variable output (1 to 5 V or 4 to 20 mA) proportional to the measured flow quantity. For models with a temperature sensor, analog output for fluid temperature is also available.
- Temperature Sensing (Optional): Detects and displays the fluid temperature, with switch outputs configurable for temperature (hysteresis or window comparator mode).
- External Input: Allows for remote resetting of accumulated flow, peak values, and bottom values.
- Display: Features a 2-color main screen (4-digit, 7-segment, red/green) and a sub-screen (6-digit, 11-segment, white) for displaying flow, set values, accumulated flow, peak/bottom values, fluid temperature, and line names.
- Response Time Setting: Allows adjustment of the switch output response time to prevent chattering due to pulsation.
- Power Saving Mode: Turns off the display after 30 seconds of inactivity to reduce power consumption, with decimal points flashing to indicate the mode.
- Security Code: Provides a key-lock function to prevent accidental changes to set values, with an optional security code for unlocking.
- Line Name Input: Allows input of up to 6 English characters/numbers to name the piping line.
- Output Check: Enables testing of circuit wiring by forcing outputs ON or OFF, irrespective of flow conditions.
Important Technical Specifications
General Specifications:
- Measured Fluid: Water and ethylene glycol solution with a viscosity of 3mPas or less.
- Detection Method: Karman vortex.
- Fluid Temperature Range: 0 to 90 °C (No freezing and condensate).
- Operating Pressure Range: 0 to 1 MPa.
- Proof Pressure: 1.5 MPa.
- Display Updating Frequency: 5 times/sec.
- Accuracy: ±3%F.S. (Display and analog output).
- Repeatability: ±2%F.S.
- Temperature Characteristics: Max. ±5%F.S. (25 °C reference).
- Power Supply Voltage: 12 to 24 VDC.
- Current Consumption: 50 mA.
- Enclosure: IP65.
- Operating Humidity Range: Operation, Storage: 35 to 85%RH (Non-condensing).
- Withstand Voltage: 1000 VAC, for 1 min. between external terminals and case.
- Insulation Resistance: 50 MΩ or more (with DC500V mega meter) between external terminals and case.
- Vibration Resistance: 10 to 500 Hz and 1.5 mm or 98 m/s² amplitude, whichever is smaller, in each direction X, Y and Z for 2 hours (un-powered).
- Impact Resistance: 490 m/s² 3 times each in directions of X, Y and Z respectively (un-powered).
- Material of Wetted Part: PPS, SUS304, FKM, SCS13 (Grease free).
Model-Specific Flow Ranges:
- PF3W704: Rated flow range 0.5 to 4 L/min, Display flow range 0.35 to 5.5 L/min, Min. setting unit 0.01 L/min.
- PF3W720: Rated flow range 2 to 16 L/min, Display flow range 1.7 to 22 L/min, Min. setting unit 0.1 L/min.
- PF3W740: Rated flow range 5 to 40 L/min, Display flow range 3.5 to 55 L/min, Min. setting unit 0.1 L/min.
Switch Output:
- Type: NPN or PNP open collector output.
- Max. Load Current: 80 mA.
- Max. Applied Voltage: 28 VDC.
- Internal Voltage Drop: NPN: 1 V max. (at 80 mA load current), PNP: 1.5 V max. (at 80 mA load current).
- Response Time: 0.5 s/1 s/2 s (for flow), 7 s (for temperature sensor output).
- Output Protection: Short circuit protection.
Analog Output:
- Voltage Output: 1 to 5 V, Output impedance: 1 KΩ min.
- Current Output: 4 to 20 mA, Max. load impedance: 300 Ω for 12 VDC and 600 Ω for 24 V.
Temperature Sensor (Optional):
- Rated Temperature Range: 0 to 100 °C.
- Setting/Display Temperature Range: -10 to 110 °C.
- Min. Setting Unit: 1 °C.
- Display Accuracy: ±2 °C.
- Analog Output Accuracy: ±3%F.S. (compared with displayed value).
- Ambient Temperature Characteristics: ±5%F.S.
Usage Features
- Easy Setting: Intuitive button operations (UP, DOWN, SET) for changing set values, selecting output modes, and configuring functions.
- Display Customization: The sub-screen display can be configured to show various parameters like set value, accumulated flow, peak/bottom hold values, fluid temperature, or line name.
- Rotatable Display: The monitor with integrated display can be rotated at 90° intervals (clock and anticlockwise) and also at 45° and 225° clockwise for optimal viewing.
- Accumulated Flow Memory: The accumulated flow value can be stored in permanent memory every 2 or 5 minutes, ensuring data retention even after power loss.
- External Input for Reset: Accumulated flow, peak, and bottom values can be reset remotely via an external input signal.
- Security: Key-lock function prevents unauthorized changes to settings, with an optional 3-digit security code.
- Line Identification: Ability to input a 6-character line name for easy identification in complex systems.
- Output Test Function: Allows for quick verification of wiring and output operation without actual flow.
Maintenance Features
- Retained Settings: Product settings are retained even after power cuts or unexpected power removal.
- Regular Maintenance and Inspections: Recommended to prevent unexpected malfunction of components.
- Cleaning: Use a soft cloth to remove stains. For heavy stains, use a cloth soaked with diluted neutral detergent and fully squeezed, then wipe with a dry cloth. Avoid solvents like benzene or thinner.
- Troubleshooting Guide: The manual includes a comprehensive troubleshooting section with common failures, possible causes, investigation methods, and countermeasures.
- Error Indication: The device displays error codes (e.g., Er 1 for OUT1 over current, Er 12 for temperature sensor failure) to help identify problems.
- Default Settings Reset: Allows restoration of all settings to their default values if configurations become uncertain.
Important Safety Instructions for Maintenance:
- Turn off the power supply.
- Ensure the flow is shut off before performing any maintenance.
- After maintenance, perform appropriate functional inspections and leak tests.
- Stop operation if equipment malfunctions or fluid leaks.
- Do not apply fluid if there is a leak.
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