Known world-wide for speed, and long service intervals Welch Chemical Duty vacuum pumps use dry, oil-free membrane (diaphragm) technology to deliver faster pumping dynamics that support filtration, evaporation, drying, degassing, impregnation, and other rough vacuum applications. There are twelve models available, with free air displacement from 0.8 cfm to 7.8 cfm, and ultimate vacuum pressure as deep as 1.5 torr. All have strong pumping dynamics to near their ultimate vacuum pressure. DryFast family models are CSA certified; 4-head and 8-head models are cUL listed. All have 1PH motors with built in thermal protection. Welch Chemical Duty dry vacuum pumps can be used for vacuum degassing, vacuum impregnation, rotary evaporators, vacuum ovens, vacuum filtering, solid phase extraction, falling film evaporators, rough vacuum distillations, gas recycling, leak detection, gas sampling and many other laboratory and industrial applications. 1.5/2.0 torr models can strip DMF @ 35C or be used with vacuum ovens. Contact your local Welch representative for expert support in selecting the best model for you specific application/sample composition requirements. V BUILT IN VACUUM CONTROLLERS (DryFast) V VACUUM CONTROLLERS AVAILABLE (4,8-head) V FASTER TO EVACUATE, STRIP, EVAPORATE, DEGAS, GAS SAMPLE, DRY, OR FILTER V LONG LASTING MEMBRANES, EASY TO REBUILD V SOLID PTFE HEADS, PTFE MEMBRANES V THE RIGHT VACUUM PUMP FOR YOUR APPLICATION Depend on Welch for durable vacuum pumps with highest performance AMERICAS Gardner Denver Thomas Inc. 1601 Feehanville Drive Suite 550 [email protected] © Gardner Denver Thomas Inc. All rights reserved. 04/2022

DryFast models DryFast models CHEMICAL DUTY DIAPHRAGM VACUUM PUMP SPECIFICATIONS Explosion proof Motor, 115/230V 60Hz 1Ph1 1. Explosion proof motor (CSA, UL) is Class I, Div. 1, Groups C&D and Class II, Div I Groups E, F & G. 2. For Models 2052, 2054, manual vacuum level control use chemical resistant, vacuum bleed valve regulators with stainless steel gauges, polypropylene construction with PVDF hose barb for 1/4” ID vacuum hose.

FLOW RATE >100 L/MIN 2. For models 2090 & 2085, tubing options are NW25 metal hose (2 m, cat. no. 710776) or gum rubber hose (5 feet hose, cat. no. 331060-5, NW25 to 13/16” ID rubber hose adapter, cat. no. 501283, with NW25 clamp cat. no. 302202, NW25 and centering ring cat. no. 303102). For manual vacuum level control use chemical resistant, vacuum bleed valve regulator (cat. no. 2090K-05) with dial vacu

MODEL 1640 DIGITAL VACUUM REGULATOR Controls and reads vacuum level from 700 to 2 Torr. Flows to 40 L/min Two-point vacuum control via in-line PTFE solenoid valve Internal chemically resistant, piezoelectric sensor A membrane keypad and intuitive menus enable easy vacuum control via process time and vacuum pressure set points. User designates 1 or 2 point vacuum level set points to control vacuum levels for a designated timed runs for up to five programs. Bench or rack mountable using thumbscrew fitting. Connect pump and apparatus using 1/4” ID tubing. Vacuum pressure units of Torr, mbar, and...