A syringe pump tester

Abstract

The equipment described allows the accuracy of a syringe pump to be tested quickly and conveniently. A digital micrometer assembly clips in place of the disposable syringe and transmits readings to a separate unit which displays flow rates in ml/h. Initial readings of pump output are given in 30 s, with readings to a higher accuracy within 4 min.

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“…Therefore it is important to collect calibration data and we present such data on our device. Several technical solutions have been proposed to test the precision of syringe pumps (Nieman et al, 1986). We programmed various fixed amounts of solution, 0.45, 0.61, 0.76, 0.91, 1.06, 1.51, 1.97, 3.03, 3.94 and 4.54 l, corresponding to 3, 4, 5, 6, 7, 10, 13, 20, 26 and 30 motor steps (each step corresponding to 0.15 l) and measured the corresponding volume of solution stored in the cup with a 5 ml capillary tube.…”

Reduced Pressure Drop in Viscoelastic Polydimethylsiloxane Wall Channels

“…Constant flow rates (0.1–1.25 mL/min) were generated to attain laminar flow ( Re : 0.69–58.6) with a syringe pump (Nexus Fusion 4000, Chemyx). Due to the working principle of the syringe pump, back pressure could be exerted in the flowing fluid, which is exerted due to the resistance of a liquid against the forward motion . To minimize this back pressure and create a stable and constant flow rate, we used syringes with a large inner diameter (58.4 mm) and attached a rubber plunger that fits tightly in the syringe.…”

“…Due to the working principle of the syringe pump, back pressure could be exerted in the flowing fluid, which is exerted due to the resistance of a liquid against the forward motion. 20 To minimize this back pressure and create a stable and constant flow rate, we used syringes with a large inner diameter (58.4 mm) and attached a rubber plunger that fits tightly in the syringe. Also, while testing, the syringe pump did not stall, which indicates that the syringe pump did not reach the programmed maximum back pressure of 107.94 kPa.…”

A calibration service for biomedical instrumentation maintenance laboratories

“…Som e 7% of the workload is e quipm e n t de sign e d inh ouse such as in fusion pum p te ste rs [ 2] an d e xte rn al pace m ake r te ste rs [ 3] . Th e calib ration proce dure s are unique to e ach in strum e n t m ode l n um be r an d are de ® n e d usin g METCAL, Fluke' s spe cialize d com pute r lan gu age .…”