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A Multichannel Syringe Pump for Steady State Flow in Soil Columns¹

ABSTRACT

A multichannel syringe pump³ was designed for maintaining a constant rate of outflow over long periods of time. Low flow rates are obtained by using a timer-control which causes the pump to make one cycle per set time interval. The pump is not pulse free, but for many studies requiring steady state water movement in soil columns this is not considered too great a disadvantage. Measured over a 10-day period at a rate of outflow of 173 ml/day, the mean day-to-day variation was less than 0.2 ml/day.

¹ Journal Article No. 414, Agr. Exp. Sta., New Mexico State Univ., Las Cruces, New Mexico 88003. Contribution from the Dep. of Agronomy, Electrical Engineering, and the Physical Science Laboratory, respectively. The work upon which this report was based was supported in part by funds obtained from the US Dep. of the Interior, Officer of Water Resour. Res., as authorized under the Water Resources Research Act of 1964.

² Associate Professor of Agronomy, Associate Professor of Electrical Engineering and Supervisor, Machine Shop, Physical Science Laboratory, respectively.

³ The pump may be constructed with the aid of a machinist, or may be purchased from the Physical Science Laboratory, New Mexico State University. Approximate costs are $450, including labor and parts, for one six channel pump as described here. Construction details are available from the authors.

Received for publication March 23, 1972. Accepted for publication September 13, 1972.