8 Magnetic Stirrers 8.5 www.hannainst.com | heavy-duty When stirring a solution, to work with a constant speed is an important factor in ensuring that the best repeatability in tests and processes is achieved. Without a tachometer, there is no way of knowing the RPMs. HI304N is a heavy-duty stirrer with a built-in tachometer. It is often desirable to stir in two directions in order to achieve maximum homogeneity. An advanced circuit allows HI304N to reverse the direction of the stir at a user-selected interval. The interval can be adjusted from 30 seconds up to 3 minutes. In addition to precision speed control, a limiter will also assure that the maximum speed will never be exceeded (Speedsafe™). Often, a sample is removed from the stirrer before the user reduces the speed. This can cause the motor to accelerate until it is destroyed. Hanna stirrers incorporate a VCO device that will stop the motor from accelerating as soon as the load is removed. HI304N Auto-reverse Magnetic Stirrers with Tachometer Specifications HI304N Maximum Stirring Capacity 2.5 liters (0.66 gallons) Low Speed Range 100 rpm High Speed Range 800 to 1000 rpm Tachometer four-digit LCD Reverse Interval from 30 seconds to 3 minutes Power Supply 110/115 VAC or 220/240 VAC, 50/60 Hz Installation Category II Cover Material AISI 316 stainless steel Environment 0 to 50°C (32 to 122°F); RH max 95% Dimensions / Weight 180 x 180 x 70 mm (7.1 x 7.1 x 2.8”) / 1.4 kg (3.1 lbs.) Ordering Information HI304N-1 (115V) and HI304N-2 (230V) is supplied with magnetic stir bar and instructions Accessories HI731320 Magnetic stir bar (10) HI731361 Retriever bar for magnetic stirrers HI324N is a heavy-duty stirrers that incorporate a timer control that will turn the motor o after a selected amount of time. The time is adjustable from 5 minutes to 2 hours. This feature allows the user to carry out other tasks without worrying about over or under stirring. HI324N can stir up to 5.0 liters (1.3 gallons), making it ideal for laboratory and production use. This stirrer allows regulated speed control. A limiter will assure the maximum speed is never exceeded (Speedsafe™). HI324N has an automatic feedback feature and incorporates an LCD tachometer. The motor is electronically-controlled to maintain the chosen speed as the load changes. If the viscosity or the level increases or decreases, the circuitry will adjust the output power. The HI324N’s RPM display guarantees repeatability in QC tests and research by constantly displaying the RPMs. HI324N Timer Controlled Magnetic Stirrers Specifications HI324N Maximum Stirring Capacity 5 liters (1.3 gallons) Low Speed Range 100 rpm High Speed Range 800 to 1000 rpm Auto-Feedback standard Timer Range from 5 minutes to 2 hours Tachometer four-digit LCD Power Supply 110/115 VAC or 220/240 VAC, 50/60 Hz Installation Category II Cover Material AISI 316 stainless steel Environment 0 to 50°C (32 to 122°F); RH max 95% Dimensions 180 x 180 x 70 mm (7.1 x 7.1 x 2.8”) Weight 1.4 kg (3.1 lb.) Ordering Information HI324N-1 (115V) and HI324N-2 (230V) are supplied with magnetic stir bar and instructions Accessories HI731320 Magnetic stir bar (10) • Stainless steel cover • Stainless steel cover Speedsafe™ Speedsafe™
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