High Pressure Microprocessor Controlled Dosing Pump

The AT1-MT is a high pressure dosing pump controlled from an integrated microprocessor giving the pump fully configurable proportional control to a PFM or 4-20mA signal and built in timer, batching and PPM dosing modes.

AT1-MT High Pressure Microprocessor Controlled Dosing Pump Introduction

The AT1-MT is a high pressure 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 AT1-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.  This is ideal for flow proportional dosing or pH correction applications.

The AT1-MT also includes a number of inputs allowing the pump to start / stop or pause, based on set conditions.

The start / stop input from a volt free contact 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 AT1-MT dosing pump to automatically stop / start the pumps, if they are being used in tandem.

The AT1-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, waste-water treatment, effluent treatment and process control, the AT1-MT is a powerful and reliable smart dosing pump for high pressure dosing applications.

The AT1-MT is powered from a switch mode power supply which is suitable for a mains supply of 100 - 240 V AC 50hz or 60Hz and is designed to IP65 specification.

AT1-MT Dosing Pump Outputs

The AT1-MT dosing pump series are available with the following outputs:-

AT1-MT Manual Control

The AT1-MT has a number of operating modes, each of which is simple to setup and integrate into a process.  The AT1-MT can be used in a manual operation mode (although our AT1-BX or AT1-BL models may be more appropriate), by switching the selector switch.  The output of the pump can then be controlled using the front mounted potentiometer across 0 - 100% of the rated output.

AT1-MT - Proportional to Pulsed Input / Flow Proportional Dosing

The AT1-MT is designed as a high pressure low flow rate dosing pump, 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.  This causes the dosing rate to increase or decrease, allowing the dosing pump to maintain an even delivery of chemical into the flow.  This model is 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 AT1-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 AT1-MT will make n strokes at the maximum speed.  The AT1-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.

AT1-MT Dosing Pump Proportional to a 4-20mA signal

In addition to dosing proportional to a pulsed input signal, the AT1-MT is a 4-20mA proportional dosing pump which allows the pump speed to be automatically regulated.  By default, the AT1-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 (eg. 100% at 4mA and 0% at 20mA)
• Expand the 4-20mA signal (eg. 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

AT1-MT PPM Dosing Pump

The AT1-MT is ideal as a chlorine or sodium hypochlorite dosing pump, as it allows a set PPM rate to be maintained in a pipeline or flow.  The AT1-MT delivers a small amount of chemical and can deliver at high pressure, when operating in PPM dosing mode, the calibrated pump doses proportional to a Water Meter.  Using the incoming pulsed signal the AT1-MT automatically calculates the relationship between the chemical strength, the flow rate and the pump strokes to ensure the desired PPM value is maintained.

AT1-MT Batching Dosing Pump

The AT1-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 mode the AT1-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, 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 AT1-MT includes a memory function which allows it to store input pulses to enable 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.  This allows the flow rate to be set between a value of 1% and 100% of the pumps rated output.

AT1-MT Timer Controlled Dosing Pump

The AT1-MT offers a sophisticated timer dosing mode, allowing the timer to be set by pushing the dosing pumps enter key, 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.

AT1-MT Wetted Parts / Liquid End

The AT1-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 AT1-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 AT1-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 to quickly and easily to ensure accurate dosing.

What's in the box with the AT1-MT?

The AT1-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.

AT1-MT Features & Benefits

The AT1-MT is a powerful, reliable and accurate chemical dosing pump, designed for high pressure operation where a specific chemical amount is to be dosed into a process or where precision control of the dosing pumps output is required. The AT1-MT is ideal for water treatment applications as either a stand alone device or as part of a larger integrated piece of control equipment.

The powerful dosing pump software makes the AT1-MT ideal for operation directly on the pump or from a remote stop / start signal 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 AT1-MT can condition the signal to ensure that the operation of the dosing pump is as required, by 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 allow 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 AT1-MT, an external audible / visual alarm, or integrated into control panels, PLC's, BMS systems or other devices.

For more sophisticated applications, the AT1-MT can use the remote Start / Stop / Pause functionality, to call for batching or timer based dosing of chemical reagents as well as 4-20mA operations, with conditioning of the signal taking place in the dosing pump software.  This ensures that the AT1-MT can be ready for even the most demanding dosing application.

Each of the different dosing modes of the AT1-MT are simply selected using the menu driven programming guide.  The onscreen prompts and simple push button operation means that programming the AT1-MT is as simple as possible.

The AT1-MT is designed specifically for chemical dosing with the wetted parts suitable for many chemical reagents.  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 AT1-MT is suitable for mounting outside.

The AT1-MT is available as the following model types:-

• AT1-MT-20-015 for an output flow rate of 1.5 Litres / Hour at 20 Bar pressure
• AT1-MT-18-02 for an output flow rate of 2.0 Litres / Hour at 18 Bar pressure

The AT1-MT is designed to IP65 specification making it suitable for locating either inside or outside and it is powered from a switch mode power supply which is able to accept a mains supply of 100 - 240 VAC at 50Hz / 60Hz making the AT1-MT, making it suitable for export markets too.

As part of our Red Dosing Pump range, the AT1-MT is rated hot for continuous dosing duty, and the pump is designed to provide a long trouble free life of accurate chemical dosing.