Watson-Marlow 120U IP31 pumps: operating instructions 22.1 PumpspecificationsA nameplate is fixed to the rear of the pump. It con-tains manufacturer and contact details, product ref-erence number, serial number and model details.120UThis pump can be controlled from the keypad orremotely. It features:Manual controlSpeed adjustment; run and stop; direction con-trol; “max” key for rapid priming; “auto start”for automatic power recovery; “auto” key forchanging between manual and auto controlRemote digital controlThe pump can be digitally controlled with acontact closure or logic input signalAnalogue controlThe pump speed can be controlled through ananalogue signal input of 4-20mA or 0-10VOutputsLogic output designated for an alarm onlyDC Tacho outputPump specificationsControl range (turndown ratio)Manual control:With 102R: 0.1-32 rpm (320:1)With 114DV: 0.1-200 rpm (2,000:1)With 400D1: 0.1-200 rpm (2,000:1)With 400DM2: 0.1-100 rpm (1,000:1)With 400DM3: 0.1-100 rpm (1,000:1)Auto control:With 102R: 0.01-32 rpm (3,200:1)With 114DV: 0.01-200 rpm (20,000:1)With 400D1: 0.01-200 rpm (20,000:1)With 400DM2: 0.01-100 rpm (10,000:1)With 400DM3: 0.01-100 rpm (10,000:1)Power supply DC input 24V @ 1ASoftware version Accessible through combination keypressEnclosure ratingIP31 to BS EN 60529. Equivalent to NEMA 2, suiable for indooruse. Protected against dripping water and falling dirt. May bewiped with a damp cloth, but should not be immersedPumphead options 114DV, 102R, 400D1, 400DM2 and 400DM3Operating temperature range 5C to 40C, 41F to 104FStorage temperature range -25C to 65C, -13F to 149FMaximum altitude 2,000m, 6,560ftHumidity (non-condensing) 80% up to 31C, 88F, decreasing linearly to 50% at 40C, 104FWeight See Section 1, General informationNoise <60dB(A)Function comparison, models 101U and 120UFunction 101U 120UAnalogueinput0-30mA and0-30V 4-20mA and 0-10VRange andoff-settrimmingpossible can only set themaximum speedSignalinversion possible not possibleTachooutput+5V and –5V atmaximum speed5V at maximumallowed speedInputimpedance 255Ω 250ΩMax speedoptions2 rpm or32 rpm, model-dependantsingle speed range,pumphead-dependantSpeedincrements10% or 1%increments0.1 rpm in manualmode and 0.01 rpmin analogue modeAnaloguecontrol2,000:1control ratio20,000:1control ratio