Dosistar NT-Switch

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The Dosistar NT-Switch are designed for switching medium to high power pumps. Due to the switching characteristics of the outputs (internal relays), the pumps will always run at 100%. There is no active flow regulation.

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    The Dosistar NT-Switch are designed for switching medium to high power pumps. Due to the switching characteristics of the outputs (internal relays), the pumps will always run at 100%. There is no active flow regulation.

    The Dosistar NT-Switch are designed as multi-channel devices. They are especially suitable for applications in which multiple liquids have to be dosed. The modular design of the device allows a multitude of different variants which can be customised for your specific application.

    In their maximum configuration the Dosistar NT-Switch offer the following functionality:

    • 4 power relays (switching of medium to high power pumps)
    • 4 transport relays (potential free relay contacts for switching small loads, e.g. warning lamps or shut-off valves, function freely configurable)
    • 1 alarm relay (potential free relay contact for signalling dosing errors)
    • 4 impulse inputs for flowmeter
    • 4 configurable digital inputs (e.g. level indicators or pause buttons)
    illustration shows a example configuration for mixing of up to four liquids

    With the Dositerm NT control unit it is possible to assign each component to one or more medium channels. This flexibility allows it to adapt the device to any hardware configuration.

    Once the medium channels have been configured, dosing profiles can be saved in the device. A dosing profile contains the following information:

    • What substance (calibration value of the flow meter)
    • What amount (absolute when charge dosing / percentage during flow measurement)
    • How many partial charges (periodic rotation between all liquids for optimal mixing)
    • Which pipe (choosing a medium channel)

    Once the configuration has been saved in the device, starting a dosing process is but a buttons press away.

    Like with all Dosistar models the Dosistar NT-Switch has the two dosing modes flow measurement and charge dosing. During flow measurement a liquid is continuously dosed, flow rate and amount are logged and displayed. The dosing only ends if the user manually stops it. During charge dosing the dosing process automatically stops once a predetermined amount has been pumped.

    Of course, the proven warning and alarm functions to protect against under-dosing and dry-running are also integrated in the Dosistar NT-Switch.

    The Dosistar NT-Switch is available in both a 230 Vac variant for stationary use and a 12/24Vdc variant for mobile applications.

    Technical Data

    ControlThrough the Dositerm NT terminal
    Supply voltage VCC230VAC, 2~ (Dosistar NT-Switch 230V)
    10…30VDC (Dosistar NT-Switch 12/24V)
    Output power relays…4 pcs. VCC, 9A each (Dosistar NT-Switch 230V)
    1…4 pcs. VCC, 20A each (Dosistar NT-Switch 12/24V)
    Output transport relays1…4 potential free relay contacts, max. 230 V, 5 A each
    Output alarm relay1 potential free relay contact, max. 230 V, 5 A
    Inputs1…4 impulse inputs for flow meter
    1…4 configurable digital inputs
    Supply: 12 V, 500 mA total / 24 V, 250 mA total (optional)
    Protection classIP 65
    Dimensions262 x 186 x 100 mm
    Weight2800 g


    The Dosistar NT model line is the redevelopment of the Dosistar pump controls. The devices allow the control and regulation of pumps in different performance classes, and are usable in a wide array of dosing applications in industrial or agricultural environments. They unify the proven operating and device concept of the Dosistar model line with the newest technology.


    The Dosistar NT devices contain of two main components:

    • The power unit, which contains the power electronics and the necessary interfaces for controlling and monitoring the pump, and all other peripheral components.
      • Dosistar NT-LV (control of medium-power DC pumps: up to 35A)
      • Dosistar NT-LVP (control of high-power DC pumps: up to 180A)
      • Dosistar NT-Switch (switching of pumps via internal relays, single or multi-channel, ideal for mixing liquids)
    • The Dositerm NT control unit, a compact and intuitive user interface.

    Features of the Dosistar NT device series

    The separation into two devices keeps the assembly costs down and cable length short. A complicated installation of entire wire harnesses from the machine to the user is no longer necessary.

    The Dosistar NT devices can have multiple optional wireless interfaces. 866 Mhz wireless communication between power and control unit, as well as WLAN and Bluetooth modules can be integrated into the devices. This allows a multitude of new applications. Remote control via mobile phone or downloading internal data logs to a PC are equally possible.

    All power units of the Dosistar NT model line have a robust and waterproof casing of protection class IP 65 (dustproof, protection against water jets). They are perfectly viable for use in rough agricultural environments. The Dositerm NT control unit has a protection class of IP 54 (protection against dust ingress in damaging quantities and splash water from any direction).

    If you are interested in our devices, here is a short checklist which helps us to find the optimal solution for your application:

    • Which supply voltage is available?
    • What is the nominal voltage and current rating and how big is the maximum flow rate of the pump?
    • Which active periphery components have to be controlled by the Dosistar NT?
    • Which sensors will be connected with the Dosistar NT and what supply voltage do these sensors need?
    • What are the required cable lengths?

    Not 100% what you were searching for? Contact us anyways. Due to the modular design of the devices we are well prepared for future developments and new applications. We will gladly offer advice and help you with finding your individually optimised solution.