Contrec 425 Flow Computer

The Contrec 425 is a mass flow computer that reads a pulse or frequency signal from just about any flowmeter and gives a stable flow rate and totalised reading, with digital filtering built in to smooth out a pulsating signal so the rate display doesn’t jump around. We see this used across a wide range of flow applications where the customer needs a reliable local readout and totaliser, not just a raw pulse count.

It has two relay outputs for high and low flow alarms, and an optional isolated 4-20mA output if the reading needs to go to a PLC or SCADA system. RS232 and RS485 ports support ticket printing with timestamps and sequential numbering, useful for anyone who needs a paper record of each batch or delivery. It also supplies 8-24V DC to power the flowmeter transducer itself, so in a lot of installations no separate transducer power supply is needed.

Before we quote this, we would normally confirm the flowmeter’s pulse output characteristics, whether the 4-20mA output or ticket printing is actually needed, and whether the installation calls for the standard enclosure or an explosion-proof housing. Power is flexible, 12-28V DC or universal AC mains, so we’d also confirm which is available on site. Hope this helps.

Technical Specifications
● POWER SECTION
Power Supply OptionsUniversal AC Mains: 110 to 240 Vac ±10%, 50 to 60Hz
DC Supply Line: 12 to 28.5 Vdc (Optionally upgradeable to 950Ω maximum loop load capability)
Transducer Power OutputAdjustable 8 to 24 Vdc regulation supply; provides up to 50mA maximum current loop output to power external sensors.
Power Isolation Loss ProtectionIntegrated Real Time Clock (RTC) and internal flash memory preserve programming parameters, totals, and logs permanently during complete power blackout conditions.
● INPUT SECTION
Frequency Pulse InputsFrequency Input Range: 0.25Hz minimum baseline up to 10kHz maximum signal bandwidth.
Compatible Types: Open Collector, Reed Switch, TTL Logic, Magnetic Pickup, Namur Proximity, or Current Pulse train signals.
Input Impedance / SensitivityMagnetic Pickup: 15mVp-p minimum trigger sensitivity threshold.
Logic / Pulse Inputs: 10kΩ internal pull-up resistance configuration.
K-Factor Scaling ParametersFully programmable pulses-per-unit metric system across a 5-digit decimal point matrix configuration.
● OUTPUT SECTION
Telemetry Output ChannelsAnalog Output Loop: Fully isolated 4 to 20 mA DC current loop output (Standard load up to 390Ω; option expands to 950Ω).
Scaled Pulse Output: Open collector transistor output stage; max. 100mA source capacity, programmable pulse width resolution.
Flow Rate Limit Alarms: 1x High Flow Alarm Output and 1x Low Flow Alarm Output (Open collector standard).
Digital Comms InterfaceRS232 Port: Standard serial protocol connection for direct PC terminal setup or hardware ticket printing link.
RS485 Port: Multi-drop network bus interface; supports comprehensive slave logging across long distance factory lines.
Local Interface OutputLarge, highly visible alphanumeric backlit LCD display detailing continuous flow rate parameters, concurrent totalizer metrics, and custom field ticket headers.
● PERFORMANCE
Computation AccuracyBetter than ±0.05% of reading for all internal flow mathematical calculations.
Analog Loop Linearity±0.1% of full scale range calibration accuracy.
Local LED DiagnosisOnboard diagnostic Green, Red, and Orange LED status lamps providing real-time hardware status indicators.
● PHYSICAL
Enclosure ConstructionField-mounting enclosure layout molded from heavy-duty impact-resistant polymers.
Mounting ConfigurationSupports panel mounting, wall surface installation, pipe attachment, or heavy industrial execution configurations.
Operator Input InterfaceErgonomic, heavy-duty tactile keypad designed to provide crisp operator interaction even when utilizing industrial gloves.
● STANDARDS CONFORMITY
Ingress Protection RatingIP65 dust tight and weatherproof certified casing protection.
Hazardous Location ApprovalsCertified under IEC, IECEx, and CSA standards for industrial safety deployment.
CE ComplianceConforms fully to standard European community electromagnetic compatibility and low-voltage electrical safety directives.

Download Contrec 425 Flow Computer information here

Datasheet: Contrec_425_Flow_Computer
Manual: Contrec_425_Manual

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