We are experts in the field of laboratory pump OEM integration, our laboratory pumps are used in multiple third party equipment. The level of integration is up to you. The entire laboratory pump can be used as a modular part or you can use the pump without the cabinet inside your own equipment, or you can use just the pump mechanism without the electronic control. What option is best will depend on the level of complexity for your application. Most customers use the laboratory pump key pad to control the pump. This is a simple operation – set the flow rate using the UP/DOWN arrows then press RUN to start the pump. If you want to control the laboratory pump through a third party piece of equipment then there are various options available these are (depends on pump type) Simple RUN/STOP – there is a contact closure that allows the laboratory pumps to be started and stopped. The flow rate would have to be programmed through the keypad or via a PC. This is useful for Post Column Reactors or other applications where the flow rate is unlikely to change, or will not change regularly RS232. All the laboratory pumps have mini USB and RS232 connections. These can be used to control the pump in “real time”. So you can set the flow rate, read the pressure and start/stop the pump. There is no timer function, so if you want to run the pump for a set period of time you would have to issue separate start/stop commands. This is a useful level of control as the safety mechanisms that prevent overpressure or detect pump stalls remain in place.
Direct laboratory pump control.
For customers that have the capability we can supply the pump mechanism on its own. This would involve you powering the stepper motor directly and measuring the speed via the rotation sensor directly. This would typically be for applications where you want to speed or slow motor directly and where the calculated flow rate does not need to be precisely controlled. In this way it is possible to correlate the speed of the pump with another metering device, typically a Coriolis flow meter. The speed of the motor can still be measured by taking the standard sensor signal. The HF300 laboratory pumps use servo motors rather than stepper motors and require their own servo controllers. We can provide details on this if required.
The laboratory pumps measure pressure with a pressure transducer. This is normally either in the pulse damper or within a Tee. The transducer itself is a static device that preduces a small voltage that varies according to pressure it is put under. As there is a slight variation in these devices they have to be calibrated in each individual pumps.