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Manually Adjustable Metering Pump With Low Level Cut-Off

Manually Adjustable Metering Pump AT2-BL with low level cut-off

The AT2-BL is a manually adjustable dosing pump with a low level cut-off from a volt free input.

AT2-BL Manually Adjustable Metering Pump Introduction

The AT2-BL is a chemical metering pump designed to precisely dose chemical reagents into a process.  The AT2-BL delivers a constant flow rate which is manually adjustable using the front mounted potentiometer.  The AT2-BL also includes a low level cut off via a volt free digital input, allowing the pump to automatically stop or start from a volt free signal.

The low level cut-off signal is normally provided from an optional Low Level Float Switch or from a Suction Lance Assembly. 

The AT2-BL is ideal for most general dosing applications, even where concentrated chemical reagents are used.  The AT2-BL also includes a special low dosing dosing mode. This restricts the maximum output of the pump to 20% of the rated output and gives the user full control from 0 - 100% of the restricted output.

The AT2-BL can be attached to a flat vertical surface for surface mounting installation or used with the optional foot-mounting bracket for foot mounting applications.  Designed primarily for water treatment, waste-water treatment, effluent treatment and process control, the AT2-BL is a simple and reliable dosing pump, for general applications.

The AT2-BL is powered from a switch mode power supply, suitable for a mains supply of 100 - 240 VAC 50hz or 60Hz.

AT2-BL Dosing Pump Outputs

The AT2-BL dosing pump series are available with the following outputs:-

Model Number*Output (Litres / Hour)Pressure (Bar)Speed (Strokes / Min)Output (mls / stroke)Hose Size (mm)Power (Watts)
AT2-BL-12-03 0 - 3.0 12.0 160 0.31 4 x 6 15
AT2-BL-10-04 0 - 4.0 10.0 160 0.42 4 x 6 15
AT2-BL-08-05 0 - 5.0 8.0 160 0.52 4 x 6 15
AT2-BL-02-08 0 - 8.0 2.0 160 0.83 4 x 6 15

AT2-BL Method of Operation

The AT2-BL is incredibly simple to operate.  The pump has an On/Off toggle switch to locally control the pump, and with power applied to the dosing pump and the switch turned to on, the AT2-BL will begin metering chemical into a process at a desired rate, using the front mounted potentiometer.

The low level input is provided from a volt free input.  This automatically causes the pump to stop or start depending on an open / closed contact.  The signal is normally provided from a Low Level Float Switch or a Suction Lance Assembly. This prevents the AT2-BL from "running dry" which is to operate when no chemical is present in the original container.

For low chemical dosing modes (below 20% of the rated output), the pump has a special low dosing mode accessed using the selector switch.  When the low dosing mode is enabled, the pumps output can be adjusted across 0 - 20% of the output using the front mounted potentiometer.

The pump can either be directly connected to a mains supply voltage or switched on using the relay output from a piece of control equipment, such as a pH controller, cooling water controller or other piece of process control equipment.

With a fixed stroke length, the flow rate of the pump can be reduced using the front mounted potentiometer which adjusts the stroke frequency and therefore ensures precision control of the flow rate.

Priming the dosing pump couldn't be simpler.  The AT2-BL has an adjustable bleed valve which is located on the pump head and using the supplied tubing that is connected back to the chemical container or chemical origin, making the priming process as simple as possible.

The AT2-BL is designed to IP65 specification, making it suitable for indoor or outdoor operation and can be foot mounted or surface mounted to a flat vertical surface.  Power is via a switch mode power supply, meaning that an AC supply voltage of 100 - 240 Volts at 50Hz / 60Hz can be used to power the pump.

AT2-BL Wetted Parts / Liquid End

The AT2-BL is designed as a chemical metering pump for industrial usage and as such has wetted parts developed specifically for chemical handling.

As standard the AT2-BL is available with a liquid end manufactured in either PVC or PVDF, with Ceramic or PTFE balls and a PTFE diaphragm.  The seals and O-rings are available in either Viton (© DuPont / Chemours) or EPDM with PTFE O-rings available as an option.

  • Head Material

    The wetted parts of the pump head are manufactured in PVC or PVDF.

  • Double ball valves

    Double union ball valves are manufactured in PVC or PVDF with Ceramic or PTFE balls 

  • Diaphragm

    The diaphragm is manufactured in PTFE.

  • Injection Valve

    The injection valves are manufactured in PVC or PVDF

  • Foot Valve & Strainer Valve

    The foot valve and strainer assembly is manufactured in PVC or PVDF

  • Seals & O-Rings

    The seals and O-Rings are manufactured in VitonEPDM or PTFE.

Our chemical compatibility database can be used to check the wetted parts.  Please don't hesitate to get in touch if you are unsure.

What's in the box with the AT2-BL?

The AT2-BL is supplied complete with everything required to begin metering chemical reagents into a process.

Supplied with the dosing pump itself are:-

  • Injection Valve with 3/8" and 1/2" BSP male threaded connections
  • Foot-valve & Strainer assembly
  • 1 metre of discharge tubing
  • 2 metres of suction / bleed tubing
  • Surface mounting kit

An optional foot mounting bracket can be included for no additional charge, if requested.

AT2-BL Features & Benefits

The AT2-BL is a robust, reliable and accurate chemical dosing pump, designed for most general process control applications in the water treatment, effluent treatment or process control sectors.  The AT2-BL is ideal for either stand alone operation or integration with process control equipment, where output control relays provide a control loop for process automation.

The AT2-BL volt free input allows the pump to be automatically stopped or started, based on a volt free input from an external device.  This is designed to be used with a Low Level Float Switch or a Suction Lance Assembly to prevent the pump from operating when no chemical is present.

Designed specifically for chemical metering, the AT2-BL is fitted with wetted parts which are suitable for many chemical reagents, and the liquid end is manufactured in PVC or PVDF, a PTFE diaphragm, with Ceramic or PTFE balls and either Viton, EPDM or PTFE seals and O-rings.  Designed to IP65 specification, the AT2-BL is suitable for mounting outside.

The AT2-BL is available as the following model types:-

  • AT2-BL-12-03 for an output flow rate of 3.0 Litres / Hour at 12 Bar pressure
  • AT2-BL-10-04 for an output flow rate of 4.0 Litres / Hour at 10 Bar pressure
  • AT2-BL-08-05 for an output flow rate of 5.0 Litres / Hour at 08 Bar pressure
  • AT2-BL-02-08 for an output flow rate of 8.0 Litres / Hour at 02 Bar pressure

As the AT2-BL series are powered from a switch mode power supply, it can operate with a mains supply of 100 - 240 VAC at 50Hz / 60Hz, making the AT2-BL suitable for integration with process plant, destined for export.

As part of our Red Dosing Pump range the AT2-BL is rated hot for continuous dosing duty, and the pump is designed to provide a long, trouble free life of precision chemical dosing.

AT2-BL Specifications

  • Specifications


    Manually Adjustable Dosing Pump With Low Level Cut-Off

    Model Number:- AT2-BL

    Control Options:-

    • Constant Dosing With Manually Adjustable Output
    • Volt Free Input for automatic stop / start. (Low level float switch input)

    Frequency:- Max 160 Strokes / Min

    Liquid End Materials:- PVC or PVDF

    Diaphragm Materials:- PTFE

    Valve Housings:- PVC & Ceramic, PVDF & Ceramic, PVDF & PTFE

    Seals & O-Rings:- Either Viton, EPDM or PTFE

    Input / Output Connections:- 4 x 6 mm tubing


    • AT2-BL-12-03:- 0 - 3.0 Litres / Hour at 12 Bar Pressure
    • AT2-BL-10-04:- 0 - 4.0 Litres / Hour at 10 Bar Pressure
    • AT2-BL-08-05:- 0 - 5.0 Litres / Hour at 8 Bar Pressure
    • AT2-BL-02-08:- 0 - 8.0 Litres / Hour at 2 Bar Pressure

    Power Consumption:- 15 Watts

    Pump Body:- Designed to meet IP65

    Mains Supply:- 100 - 240 VAC 50Hz / 60Hz

    Supplied with:- 

    • Surface Mounting Bracket
    • Injection Valve
    • Foot-valve & Strainer Assembly
    • Discharge tubing
    • Suction tubing / Bleed tubing
    • Optional foot mounting bracket
  • Ordering Information

    Model Number*Output (L / Hr)Pressure (Bar)Liquid EndSeals & O-rings
    AT2-BL-12-03-PVC-V 0 - 3.0 12.0 PVC Viton
    AT2-BL-10-04-PVC-V 0 - 4.0 10.0 PVC Viton
    AT2-BL-08-05-PVC-V 0 - 5.0 8.0 PVC Viton
    AT2-BL-02-08-PVC-V 0 - 8.0 2.0 PVC Viton
    AT2-BL-12-03-PVC-E 0 - 3.0 12.0 PVC EPDM
    AT2-BL-10-04-PVC-E 0 - 4.0 10.0 PVC EPDM
    AT2-BL-08-05-PVC-E 0 - 5.0 8.0 PVC EPDM
    AT2-BL-02-08-PVC-E 0 - 8.0 2.0 PVC EPDM
    AT2-BL-12-03-PVDF-V 0 - 3.0 12.0 PVDF Viton
    AT2-BL-10-04-PVDF-V 0 - 4.0 10.0 PVDF Viton
    AT2-BL-08-05-PVDF-V 0 - 5.0 8.0 PVDF Viton
    AT2-BL-02-08-PVDF-V 0 - 8.0 2.0 PVDF Viton
    AT2-BL-12-03-PVDF-E 0 - 3.0 12.0 PVDF EPDM
    AT2-BL-10-04-PVDF-E 0 - 4.0 10.0 PVDF EPDM
    AT2-BL-08-05-PVDF-E 0 - 5.0 8.0 PVDF EPDM
    AT2-BL-02-08-PVDF-E 0 - 8.0 2.0 PVDF EPDM

    Viton (© DuPont / Chemours)

    For PTFE options please call.


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