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December 1, 1998

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Product News - Circulating Oil Temperature Controls Have Higher Heating CapacitiesAnd Flow Rates

Circulating Oil Temperature Controls Have Higher Heating Capacities And Flow Rates

pn4-1298.jpgThe HF series of circulating oil temperature control systems is an addition to the manufacturer's HTF System series and is designed with higher heating capacities and flow rates for larger applications. Units start at $11,000.

Two models are available: the 3-hp unit has a flow rate of 40 gal/min and the 5-hp unit has a flow rate of 60 gal/min. Heating capacities range from 12 to 96 kw/zone for one-zone units and 12 to 48 kw/zone for two-zone units.

The HF series follows the HTF System design for heating and cooling. Heating is provided via individual 2 kw heating elements horizontally mounted in an insulated manifold. The small hold-up volume and design of the manifold is said to ensure maximum accuracy, with reduced power requirements for start-up, mold changeovers and reaction to setpoint.

A 'continuous flow' cool oil reservoir is said to eliminate thermal shock by isolating the cooling circuit from the heating circuit. The 'continuous flow' heat exchanger is said to increase heat transfer rates and, thus, cooling capacity. The reservoir also introduces oil to the recirculating circuit while hot oil is returned to the reservoir for controlling and cooling purposes based on process demand.

Other HF series features include:

  • Glycerin-filled pressure gages

  • Microprocessor-based controller

  • Dual high-temperature/low-pressure safety shut-off

  • 3 hp three-phase centrifugal ductile iron pump

  • Automatic air purge

  • Motor, heater and transformer fusing.

PN 5-1298 In a related move, the company has announced that Barber-Colman controls are now standard on its line of circulating oil temperature control systems and optional on water systems (this option adds $125 to the cost). These controls, now standard, were announced as available last year (see Mar/Apr' 97 PA, p 27).

The control's adaptive tuning is said to provide faster, better process control because it constantly monitors the process for changing load characteristics and adjusts the tuning as necessary.

A ramp to setpoint feature is said to take the process to setpoint quickly and accurately. The user can adjust and match the controller response time to varying process load characteristics.

Other control features include: AT Self-Tune for hands-off automatic PID tuning at start-up, push-button dual setpoint, serial or linear communications, dual LED indication of setpoint and process fluid temperature, remote control and a three-year warranty.

Mokon Div.,
Protective Closures Co., Inc.
Buffalo, NY

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