High Flow Rate Microprocessor Controlled Dosing Pump
The AT4-MT is a high flow rate dosing pump which offers a number of smart dosing modes including PPM dosing, batching or timer controlled dosing as well as proportional dosing of chemical reagents into a process.
AT4-MT Microprocessor Controlled Dosing Pump Introduction
The AT4-MT is a microprocessor controlled solenoid dosing pump. The microprocessor control allows the dosing pump to be fully configured by the operator to provide a number of dosing modes combined with a precision delivery and chemically resistant wetted parts.
The dosing modes offered by the AT4-MT are as follows:-
- Constant flow rate - where the chemical delivery is set manually using the front mounted dial
- Proportional to a pulsed input signal - this can come from a water meter or compatible instrument, such as our P7685, P7687 or P6587
- Proportional to a 4-20mA output - supplied from a compatible instrument or process controller
- PPM Dosing Mode - the dosing pump will maintain a desired PPM rate in a pipe proportional to flow rate
- Batch Dosing Mode - the user sets volume of chemical in the pump which is then transferred or batched into a process
- Timer Dosing Mode - the user sets the volume of chemical to be transferred and sets a delay or interval timer between the batches
When operating in proportional mode the external control signal automatically varies the frequency or number of strokes the dosing pump makes per minute. This allows the pump to increase or decrease the flow rate depending upon the instruction from the instrument and makes it ideal for flow proportional dosing or pH correction applications.
The AT4-MT also includes a number of inputs allowing the pump to start / stop or pause, based on set conditions.
The start / stop input is from a volt free contact, which is designed to operate as a low level cut-off. The volt free input can be connected to an optional Low Level Float Switch or Suction Lance Assembly to prevent the pump from running when a low chemical level is present. The low level cut-off can be used in all operation modes.
The remote control input (start / stop or pause). This can be used to remotely pause the pump in all operating modes, or to initiate the Timer or Batch dosing modes.
The Flow Sensor Input works with an optional input. When this mode is activated the dosing pump counts the number of strokes it has made and compares it to the signal from the flow sensor. The pump then compares the two signals and if the pump is stroking and no signal is received from the flow sensor, it enters into an alarm condition. The relationship between flow sensor outputs and pump strokes is fully user configurable (default value is 6).
The Alarm Relay is an internal alarm which energises when the pump enters an alarm condition (such as a low chemical level, or no signal from a flow sensor). This can be used to either trigger remote equipment such as an audible alarm, flashing beacon, BMS or PLC system. The volt free alarm relay can also be wired into another AT4-MT dosing pump to automatically stop / start the pumps, if they are being used in tandem.
The AT4-MT 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, wastewater treatment, effluent treatment and process control, the AT4-MT is a powerful and reliable smart dosing pump, for most general chemical dosing applications.
The AT4-MT is powered from a switch mode power supply, suitable for a mains supply of 100 - 240 VAC 50hz or 60Hz and is designed to IP65 specification.
AT4-MT Dosing Pump Outputs
The AT4-MT 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)|
|AT4-MT-20-05||0 - 20.0||5.0||300||1.11||8 x 12||25|
|AT4-MT-30-03||0 - 30.0||3.0||300||1.66||8 x 12||25|
|AT4-MT-40-02||0 - 40.0||2.0||300||2.22||8 x 12||25|
|AT4-MT-60-01||0 - 60.0||0.5||300||3.33||8 x 12||25|
AT4-MT Manual Control
The AT4-MT has a number of operating modes each of which is simple to setup and integrate into a process. The AT4-MT can be used in a manual operation mode, although our AT4-BX or AT4-BL models maybe more appropriate, using the menu driven software. The output of the pump can then be controlled using the front mounted potentiometer across 0 - 100% of the rated output.
AT4-MT Proportional to Pulsed Input / Flow Proportional Dosing
The AT4-MT is designed as a chemical dosing pump, suitable for a high flow rate applications and is able to dose proportional to a pulsed input signal. This volt free input signal can be supplied from a water meter or a process controller which provides a pulsed output.
When dosing proportional to the flow from a water meter, the water meter provides pulses based on the measured flow rate, eg. 1 pulse per litre. As the flow rate increases or decreases, the number of pulses which are transmitted to the dosing pump increase or decrease, causing the dosing rate to increase or decrease. This allows the dosing pump to maintain an even delivery of chemical into the flow, making it ideal for water treatment and boiler dosing applications.
When dosing proportional to a process controller, the instrument will supply a pulsed output to the dosing pump. This causes the pump speed or number of strokes per minute to increase or decrease proportionally. The benefit of this is that the chemical reagent is delivered more quickly, the further away from the setpoint and a smaller amount as it approaches the setpoint, reducing chemical usage and minimising the risk of over-dosing.
To ensure compatibility with a wide range of external equipment, the AT4-MT can multiply or divide the incoming pulses. The following multiplication and division modes are available:-
- 1:1 mode - where 1 pulse from the control equipment results in 1 stroke of the pump
- The signal can be multiplied from a factor of 1:n where 1 pulsed input equals n strokes, n can be any number from 1 to 999.
- The signal can be divided from a factor of n:1 where n pulsed inputs equals 1 strokes, and n can be any number from 1 to 999.
In 1:n dosing mode - at the first signal received, the AT4-MT will make n strokes at the maximum speed. The AT4-MT will then measure the time between the successive pulses (maximum period of 60 seconds), and distribute the strokes evenly across the time period to ensure consistent dosing. The time between which signals are ignored (timeout) can be set in the dosing pump software to prevent the pump from responding to signals over excessively long times.
AT4-MT Dosing Pump Proportional to a 4-20mA signal
In addition to dosing proportional to a pulsed input signal, the AT4-MT is a 4-20mA proportional dosing pump, allowing the pump speed to be automatically regulated. By default, the AT4-MT stops at 4mA and at 20mA allows the user to set the dosing rate (eg. 100% at 20mA). The 4-20mA input signal can be configured in the dosing pump software in the following ways:-
- Invert the 4-20mA signal (e.g. 100% at 4mA and 0% at 20mA)
- Expand the 4-20mA signal (e.g. dose at 0% at 8mA and 100% at 12mA
- Select a flow rate to dose at based on the 4-20mA signal - the figure can be entered in Percentage, frequency, L/Hr, Gph or ml / min.
AT4-MT PPM Dosing Pump
The AT4-MT is ideal as a flow proportional dosing pump as it allows a set PPM rate to be maintained in a pipeline or flow. Using a water meter to measure the flow rate, the AT4-MT delivers enough chemical reagent into the flow, to maintain a set PPM rate. The PPM rate is entered into the pump software using the menu driven configuration process.
AT4-MT Batching Dosing Pump
The AT4-MT can also be used as a batching dosing pump with the required amount to be batched easily set using the inbuilt dosing pump software.
In batch dosing mode, the AT4-MT can be configured to deliver a set volume of chemical. The range is from 0 - 30'000ml (30.000 litres), which can be started by pushing the enter button on the pump itself or by using a volt free signal to the remote stop / start input, or from using the pulsed input from a water meter. The amount to be batched is entered in ml (millilitres) into the pump software.
The amount of chemical that has been transferred in dosing mode is counted on the bright LCD (Liquid Crystal Display) so the operator can see both the amount to be batched, and how much has been batched so far, viewed at the same time.
When working to an external signal, when the signal is received, the dosing pump will then batch the desired amount of chemical. The AT4-MT includes a memory function which allows it to store input pulses, while enabling multiples of the batched amount to be transferred if required.
The speed at which the chemical reagent is batched into the process can be manually adjusted also, allowing the flow rate to be set between a value of 1% and 100% of the pumps rated output.
AT4-MT Timer Controlled Dosing Pump
The AT4-MT offers a sophisticated timer dosing mode, allowing the timer to be set by pushing the enter key on the dosing pump, or from a remote volt free signal. The pump can be set with a delay timer so that it begins dosing at a set time, and also an interval timer between two successive doses. The timers can be set in Days, Hours and Minutes.
AT4-MT Wetted Parts / Liquid End
The AT4-MT is designed as a chemical metering pump for industrial usage and as such has wetted parts developed specifically for chemical handling.
As standard, the AT4-MT 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.
Our chemical compatibility database can be used to check the wetted parts. Please don't hesitate to get in touch if you are unsure.
Priming the liquid end for dosing couldn't be simpler. The AT4-MT is supplied with tubing and has an adjustable bleed valve located on the pump head. Loosening the bleed valve allows the chemical reagent to be circulated through the pump quickly and easily to ensure accurate dosing.
What's in the box with the AT4-MT?
The AT4-MT 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.
AT4-MT Features & Benefits
The AT4-MT is a powerful, reliable and accurate chemical dosing pump, offering high flow rates for a wide range of chemical dosing applications. It can dose accurately to an external signal; batch a specific amount of chemical; maintain a PPM rate or run for a desired time period.
The AT4-MT is ideal for water treatment applications, either as a stand alone device or as part of a larger integrated piece of control equipment.
The powerful dosing pump software makes the AT4-MT ideal for operation directly on the pump or from a remote stop / start signal. This can be from a PLC or the relay contact outputs of a process controller, such as a pH controller or Conductivity controller.
When operating in proportional control modes, the AT4-MT can condition the signal to ensure that the operation of the dosing pump meets the requirements of the process. This includes full inversion and expansion of the 4-20mA and granular multiplication and division of the pulsed input, making setting up and commissioning the metering pump as simple as possible.
The microprocessor driven dosing pump can operate in batch dosing mode and timer dosing mode, independently from external controls, ensuring simple batching processes are delivered accurately and safely.
Adding simple control devices such as a low level float switch, and flow verification input from a flow sensor allows the dosing pump to stop in an alarm condition, to ensure processes can be controlled safely.
For more complicated applications, the output alarm relay can be used in a number of ways: including connecting to another AT4-MT, an external audible / visual alarm, or integrated into control panels, PLC's, BMS systems or other devices.
For more sophisticated applications, the AT4-MT can use the remote Start / Stop / Pause functionality to call for batching or timer based dosing of chemical reagents. In addition, using 4-20mA operations with conditioning of the signal taking place in the dosing pump software, ensures that the AT4-MT can be ready for even the most demanding dosing application.
Each of the different dosing modes of the AT4-MT are simply selected using the menu driven programming guide. The onscreen prompts and simple push button operation means that programming the AT4-MT is as simple as possible.
The AT4-MT is designed specifically for chemical dosing with the wetted parts suitable for many chemical reagents. With a liquid end manufactured in PVC or PVDF, a PTFE diaphragm, Ceramic or PTFE balls, either Viton, EPDM or PTFE seals and O-rings and designed to IP65 specification, the AT4-MT is suitable for mounting outside.
The AT4-MT is available as the following model types:-
- AT4-MT-20-05 for an output flow rate of 20.0 Litres / Hour at 5.0 Bar pressure
- AT4-MT-30-03 for an output flow rate of 30.0 Litres / Hour at 3.0 Bar pressure
- AT4-MT-40-02 for an output flow rate of 40.0 Litres / Hour at 2.0 Bar pressure
- AT4-MT-60-01 for an output flow rate of 60.0 Litres / Hour at 0.5 Bar pressure
As the AT4-MT is designed to IP65 specification, it is suitable for locating either inside or outside and is powered from a switch mode power supply which is able to accept a mains supply of 100 - 240 VAC at 50Hz / 60Hz and makes the AT4-MT suitable for export markets too.
As part of our Red Dosing Pump range, the AT4-MT is rated hot for continuous dosing duty, and the pump is designed to provide a long trouble free life of accurate chemical dosing.
High Flow Rate Manually Adjustable Dosing Pump
Model Number:- AT4-MT
- Constant Dosing With Manually Adjustable Output
- Proportional to 4-20mA input signal
- Proportional to pulsed input with multiply / divide function
- PPM dosing proportional to flow signal from a water meter
- Batch dosing up to 30'000ml (30 Litres)
- Timer dosing with delay and interval timer settings in Days, Hours & Minutes
- Remote Start / Stop from Volt Free Contact (low level input)
- Remote Stop from pulse verification input (flow sensor required)
- Remote Start / Stop / Pause also used to remote trigger timer and batch dosing modes
- Volt Free Alarm relay output from low level or flow verification inputs
Frequency:- Max 300 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:- 8 x 12 mm tubing
- AT4-MT-05-20:- 0 - 20.0 Litres / Hour at 5 Bar Pressure
- AT4-MT-03-30:- 0 - 30.0 Litres / Hour at 3 Bar Pressure
- AT4-MT-02-40:- 0 - 40.0 Litres / Hour at 2 Bar Pressure
- AT4-MT-01-60:- 0 - 60.0 Litres / Hour at 0.5 Bar Pressure
Power Consumption:- 25 Watts
Pump Body:- Designed to meet IP65
Mains Supply:- 100 - 240 VAC 50Hz / 60Hz
- Surface Mounting Bracket
- Injection Valve
- Foot-valve & Strainer Assembly
- Discharge tubing
- Suction tubing / Bleed tubing
- Optional foot mounting bracket
Model Number* Output (L / Hr) Pressure (Bar) Liquid End Seals & O-rings AT4-MT-05-20-PVC-V 0 - 20.0 5.0 PVC Viton AT4-MT-03-30-PVC-V 0 - 30.0 3.0 PVC Viton AT4-MT-02-40-PVC-V 0 - 40.0 2.0 PVC Viton AT4-MT-01-60-PVC-V 0 - 60.0 0.5 PVC Viton AT4-MT-05-20-PVC-E 0 - 20.0 5.0 PVC EPDM AT4-MT-03-30-PVC-E 0 - 30.0 3.0 PVC EPDM AT4-MT-02-40-PVC-E 0 - 40.0 2.0 PVC EPDM AT4-MT-01-60-PVC-E 0 - 60.0 0.5 PVC EPDM AT4-MT-05-20-PVDF-V 0 - 20.0 5.0 PVDF Viton AT4-MT-03-30-PVDF-V 0 - 30.0 3.0 PVDF Viton AT4-MT-02-40-PVDF-V 0 - 40.0 2.0 PVDF Viton AT4-MT-01-60-PVDF-V 0 - 60.0 0.5 PVDF Viton AT4-MT-05-20-PVDF-E 0 - 20.0 5.0 PVDF EPDM AT4-MT-03-30-PVDF-E 0 - 30.0 3.0 PVDF EPDM AT4-MT-02-40-PVDF-E 0 - 40.0 2.0 PVDF EPDM AT4-MT-01-60-PVDF-E 0 - 60.0 0.5 PVDF EPDM
Viton (© DuPont / Chemours)
For PTFE options please call.