Tacmina PZ Series electronic metering pumps operate at a capacity that can range from 1 to 1,300 mL/min, and at pressures up to 220 psi. They are available in manual control, external input and programmable models. The pumps are suitable for applications that require accurate, reliable injection of liquid chemicals, nutrients or disinfectants. They will operate on any single-phase voltage, from 94 VAC to 264 VAC, and their patented design leaves flowrates and accuracy unaffected by voltage fluctuations.

For pumping radioactive chemicals where a beta or gamma shield must be present, the KDS 310 Nano Pump syringe pump features a remote pumping unit and control box that can be located up to 6 ft away, thereby protecting the operator. The pump is used exclusively with micro-syringes in sizes from 0.5 to 250 µL. Small size, remote control and a rugged mounting arm make it suitable for use with micromanipulators, stereotaxic frames and other clamping devices. When used on a stereotaxic frame, direct injection can be performed, thus reducing the volume of sample required.

The 2- and 3-in. ported metallic models in the ARO Pro Series of diaphragm pumps are now available in additional materials of construction. Previously offered only in aluminum, the Pro Series now includes cast iron and stainless steel models. Like their aluminum counterparts, the new models feature patented air-valve technology that eliminates pump stalling by utilizing an unbalanced design — by creating an optimal pressure differential, air valves do not center, even under low air inlet pressures.

Optos Series metering pumps employ a positive-displacement, reciprocating piston assembly to provide precise metering at high pressures (up to 6,000 psi). The piston is driven by a high-resolution stepper motor using advanced sine-wave-adjustment speed algorithms to maximize flow output and minimize pulsations. Three models are available for flows of 0.002–20 mL/min, 0.003–40 mL, and 0.01–80 mL/min. The materials in the liquid end are chosen based on corrosion resistance; the piston is sapphire, and the inlet and outlet valves incorporate sapphire seats and ruby balls.

Its compact, vertical, close-coupled design allows this pump to easily fit into confined areas, where it can be flange-mounted to closed tanks or affixed to mounting beams above open tanks. The pump has a flow range of 20–350 gal/min and pressure capability to 150 psi, and is compatible with vessels up to 20 ft deep. Mechanical seal replacement is simple and can be done without removing the pump from the sump or its mount. The pump can handle high-viscosity, high-solids-content materials, as well as abrasive fluids.

A single ball check valve enables the H-Flo packed-plunger, positive-displacement metering pumps to provide heavy-duty, virtually maintenance-free metering of chemicals and solutions. The pumps are available in both simplex and duplex models, with capacities ranging from 20 to 682 gal/h at pressures up to 7,200 psi with an accuracy of ±0.5% at steady state. Pump capacity is adjustable from 0 to 100% by varying the piston stroke length while the pump is stopped. Duplex pumps are normally 180-deg. out of phase, but can be synchronized so that two fluids can be pumped simultaneously.

Two new sizes have been added to this firm’s line of ANSI B73.1 centerline discharge, rear-pullout horizontal process pumps, Model CGA-8×6×13 (ANSI-A-90) and Model CGA-8×5×15 (ANSI-A110). Flow capacities range to 3,100 gal/min and heads to 350 ft. Fluid contact is restricted to thermoplastics — polypropylene and polyvinylidene fluoride (PVDF) — and other non-metallic materials.

The SPX corrosive chemical pump features a Bioprene thermoplastic elastomer (TPE) hose element that has excellent chemical resistance to many of the harshest chemicals. And because the hose element is the only component in contact with the pumped product, corrosive and abrasive wear are not factors for the pump’s rotor or body. With no seals to replace, no check valves to clog, and no rotors or stators to wear out, the SPX pump is virtually maintenance-free.

Made of polypropylene and nylon, and elastomers such as Santoprene, Viton and EPDM, the Triplex positive-displacement pump can handle tough chemicals without corroding. It is manufactured using co-injection mold diaphragm technology, which virtually eliminates potential leak paths. A unique bypass design allows the pump to adapt to a range of flowrates at a constant pressure — up to 2 gal/min and 150 psi. It is available in 12- and 24-VDC, as well as 115- and 230-VAC, models.

Despite its small size and light weight (3 lb), the E8 3/8-in. Mini-Matic can pump up to 6.8 gal/min (26 L/min) at pressures up to 100 psi (6.8 bar). It can be mounted upright, sideways or inverted for use in a wide variety of applications. It features the Elima-Matic air valve system to eliminate leakage and deliver non-stalling, non-icing lube-free operation. Wetted components can be made of polypropylene or Kynar, and interiors of Santoprene, Geolast or Teflon.