Hoefer PP24 - Manual (Page 6)

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Publication 5392-001-REV-A
Operating Instructions
Description
The Harvard MPII Mini-Peristaltic pump takes only one size of tubing, 1.6
mm ID x 3.2 mm OD (1/16 x 1/8 in). It can be used with either a single tube
or two tubes simultaneously.
Two front panel controls provide flow rates from approximately 0.8 to
12.25 ml/min. The control knob provides variable adjustment from 0 to
100% of the selected flow rate range.The second control is a two position
toggle switch marked x1, x2 which selects low or high flow rates, see table
to right.
The easy-loading four-roller pump head is on top of the stout metal box.The
back of the pump head effortlessly rotates into an ‘open’ position and either
one or two tubes can be dropped into slots. The loaded section simply
rotates back against spring loaded jaws and locks into place. The tubing is
automatically in proper wiping contact with the pump head rollers. Each
Pump is provided with a 12.5 mm (0.5 in) rod clamp on the back so that
multiple pumps can be mounted vertically on a lattice rod.
Location Requirements for the MP II Mini-Peristaltic Pump
• A Sturdy, level, clean and dry surface
• Minimum of one inch (2 cm) clearance around the pump
• Adequate power supply
• Room temperature 4°C to 40°C (40°F to 104°F)
• Relative humidity 20% to 80%
• A well ventilated room
Power Requirements
The MP II Mini Peristaltic Pump requires 12 VDC at 800 mA. The power
receptacle has a 2.5 mm center pin, which is the positive polarity. One (1)
universal power supply is provided for 120/230 VAC operation. Plug the out-
put connector into the rear receptacle of the Mini Peristaltic pump.The uni-
versal power transformer automatically adjusts the supply voltage. The
North American plug can be replaced with a similar power cord with an IEC
320 plug. Observe the color coding of the international line cord.
Brown – High
Blue – Neutral
Green – Ground (earth)
Tubing
The pump is designed for silicone rubber tubing 1/16 inch I.D. x 1/8 inch
O.D. only.The pump is supplied with two short lengths of tubing with end
connectors fitted. If other tubing materials are used, please verify pump
flow rates. Excessively hard tubing may overload the pump motor and
cause if to ‘stall’.