Precise chemical dosing / Simple control / Reliable operation
REACH® is a compact solenoid-driven diaphragm metering pump designed for accurate dosing of compatible liquid chemicals in water-treatment and industrial processes.
The pump regulates chemical feed through independently adjustable stroke length and stroke frequency. External pulse control, configurable pulse multiplication or division, level-switch connectivity and optional signal inputs allow the dosing rate to follow actual process demand. A corrosion-resistant housing, PTFE-faced diaphragm, double-ball check valves and selected liquid-end materials support reliable operation across a range of compatible chemical-feed applications.
Controlled chemical feed / Matched to real process demand
One dosing platform.
Multiple chemical-feed applications.
REACH® can be integrated into water-treatment and chemical-processing systems for proportional, continuous or pulse-controlled dosing. Chemical compatibility must be confirmed for the selected liquid-end, valve, seal and tubing materials.
Disinfection Chemical Dosing
Controlled dosing of compatible liquid disinfectants into appropriately designed treatment systems.
pH Adjustment
Metering of compatible acids or alkalis for automatic process-pH control.
Scale and Corrosion Control
Proportional dosing of compatible antiscalants and corrosion inhibitors.
Coagulation and Flocculation
Controlled dosing of suitable liquid coagulants or polymer solutions within viscosity limits.
Boiler and Cooling Water
Chemical conditioning for compatible boiler-feed, closed-loop and cooling-water programs.
Industrial Process Dosing
Repeatable chemical addition in manufacturing and water-dependent production processes.
Four operating capabilities engineered into one metering pump
Virtually Wear-Free Drive (SOLENOID-DRIVE™)
A short-stroke solenoid moves the diaphragm through magnetic pulse action. The armature is the principal moving drive component, supporting compact and overload-resistant operation.
Stroke Length and Frequency Control (DUAL-ADJUST™)
Metering capacity can be adjusted through continuous stroke-length control and ten stroke-frequency settings, allowing the output to be matched to process requirements.
External Signal Integration (PULSE-LINK™)
Voltage-free contact control and configurable pulse multiplication or division enable integration with water meters, controllers and other process signal generators.
Chemical-Resistant Liquid End (LIQUID-GUARD™)
A PTFE-faced diaphragm, PVDF liquid-end option, double-ball check valves and leak-routing weep hole support reliable chemical handling when material compatibility is confirmed.
Science & Technology
REACH® uses electromagnetic pulses to move a flexible diaphragm through a controlled stroke, alternately drawing chemical into the dosing head and discharging it into the process line.
- Electromagnetic Actuation – Each electrical pulse generates a magnetic field that moves the solenoid armature and attached diaphragm forward.
- Positive-Displacement Metering – Forward diaphragm movement displaces a defined liquid volume through the discharge valve. Spring-assisted return movement draws fresh chemical through the suction valve.
- Dual Capacity Adjustment – Output is controlled by changing stroke length, stroke frequency or both. The brochure recommends operating at a minimum 30% stroke length for stated repeatability.
- Automatic Process Integration – Pulse contacts, optional analogue inputs, level-switch connection and relay options allow the pump to respond to process demand and system status.
Technical Data
Key specifications, performance data for BT4b 0402, and control options for REACH®.
Selected BT4b 0402 Performance
| Performance Point | Standard Liquid End | Self-Bleeding Head |
|---|---|---|
| Delivery at 4 bar | 2.8 L/h | 2.1 L/h |
| Volume per stroke at 4 bar | 0.26 mL | 0.19 mL |
| Delivery at 2 bar | 3.6 L/h | 2.5 L/h |
| Volume per stroke at 2 bar | 0.36 mL | 0.23 mL |
| Connection size | 6 × 4 mm | 6 × 4 mm |
| Suction lift | 6.0 mWC | 6.0 mWC |
| Priming lift | 2.5 mWC | 2.5 mWC |
| Maximum suction-side pressure | 5.5 bar | 0.5 bar |
General Technical Specifications
| Property | Published Specification |
|---|---|
| Pump technology | Solenoid-driven diaphragm metering pump |
| Maximum stroke length | 1.25 mm |
| Stroke-length adjustment | 0–100%; recommended 30–100% |
| Stroke-frequency adjustment | 10 settings from 10–100% |
| Metering repeatability | ±2% under constant conditions at ≥30% stroke |
| Housing | Fiberglass-reinforced PPE |
| Diaphragm | PTFE-faced, fabric-reinforced EPDM with plastic core |
| Listed liquid-end option | PVDF |
| Check valves | Double ball |
| Enclosure protection | IP65 |
| Insulation class | Class F |
| Ambient temperature | -10°C to 45°C |
| PVDF fluid temperature | 65°C continuous; 100°C short-term |
| Standard power supply | 100–230 VAC, single phase, 50/60 Hz |
| Low-voltage versions | 12–24 VDC and 24 VAC/DC options |
| Power cable | Approximately 2 m |
| Shipping weight | Approximately 2.9 kg |
| Standard-liquid-end viscosity | Maximum 200 mPa·s/cP |
| Auto-degassing-head viscosity | Maximum 50 mPa·s/cP |
Listed Control Options
- Voltage-free external On/Off contact
- External pulse control
- Pulse multiplication and division
- Connector for two-stage level switch
- Stop and test/priming functions
- Operating-status LEDs
- Optional 0/4–20 mA input
- Optional fault or pacing relay
- Optional diaphragm-failure detector
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Frequently
Asked Questions
Important information about REACH® selection, control, chemical compatibility, installation and maintenance.
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