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| FEATURES |
| These plastic purge meters are low capacity, variable-area flow meters which incorporate several improvements in basic meter design. They feature a positive, easily secured tube lock. A plastic frame of Kynar ® vinylidene fluoride resin is outstanding for its strength and rigidity; also for its corrosion resistance in hostile atmospheres. These purge meters are designed for such service as: liquid-level measurement; orifice or control line purging; leak detection; controlling flow of aggressive fluids – all in the moist, highly corrosive atmospheres often found in pulp and paper mills, petrochemical refining plants, and waste treatment plant influent manholes. They are also ideal for air sampling in industrial atmospheres and for proportioning in devices that require mixtures of gases or liquids, such as continuous photographic processes. For measuring high-volume flows at 2% full scale accuracy, request TI 520.215 on the PVC-tube Varea-Meter ® . This flanged meter handles aggressive chemicals in highly corrosive atmospheres and is ideal for connection to plastic pipe. |
| STRUCTURALLY STRONG FRAME |
| For strength and rigidity, frames are one piece of solid, molded Kynar. The frame and "end fittings" are molded in one piece to produce a rigid unit which resists pipe strains and protects tube alignment. |
| CORROSION-RESISTANT MATERIALS |
| The one-piece frame and "end fittings", tube retainers, and tube lock are Kynar. This fluorocarbon plastic frame, unlike acrylic-frame and combination plastic-metal- frame meters, resists aggressive process environments and high temperature process fluids. O-rings are Viton, with Buna N and EPR (ethylene-propylene rubber) optional. The optional con-trol valve and valve trim are Kynar and can be located on the inlet or outlet. |
| POSITIVE TUBE LOCK, TUBE SHIELD |
| A threaded-tube-locking plug, external to the flow, exerts pressure on the tube retainer and locks the tube firmly in place. The tube lock has a screwdriver slot and is accessible from the top of the meter. Tube removal is quick and easy with the meter in the line. O-rings seal the tube at both ends. A clear plastic shield covers the tube. It has tabs which snap into slots in the frame. |
| STABLE FLOAT PERFORMANCE |
| Wallace & Tiernan Products Purge Meter floats are highly stable, give consistently repeatable readings after flow surges and in spite of considerable vibration. |
| INTEGRAL BACKCHECK |
| A guided glass ball is built into the meter discharge. It serves as an effective anti-backflow device. |
| FEATURES MINIMUM PARTS |
| All parts, including frames, tubes, tube locks and retainers, and plastic shields are interchangeable for all meter capacities. O-rings are the same size at both ends of the tube. Spare-parts stocking is simplified. |
| CHOICE OF ARRANGEMENTS AND OPERATING POSITIONS |
| Kynar-frame Purge Meters are available with or without a characterized-stem control valve with knob control. Viton O-rings are standard; Buna N and EPR are optional. Inverting the meter and reversing the tube changes the control valve from the inlet to the discharge. |
| CONVENIENT TO USE |
| This meter’s 3-inch scale makes it easy to read out the flow rate. Long movement of the characterized needle in the control valve gives a fine degree of flow control. It also gives positive shut-off. |
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