Section 11240

CHEMICAL FEED EQUIPMENT

2.                 PRODUCTS

2.1  DRY VOLUMETRIC FEEDERS

A.     Feeder shall be capable of delivering soda ash or activated carbon at a rate of ( ) cubic feet per hour. Unit shall be the volumetric twin-screw type.

B.      Unit shall have interchangeable bayonet-mounted screws, a hemispherical feed bowl with integral agitator to promote material flow, and ( ) cu. ft. extension hopper.  Screw length as measured from centerline of feed hopper shall be ( )

C.      All material contact surfaces shall be 316ss with a 2B mill finish inside

D.      Control shall be microprocessor based DC speed controller with pulse width modulation.  Unit shall have motor speed feedback thus providing closed loop control.  Accuracy shall be +/- 1 rpm over a 100:1 turndown.  Motor drive shall instant electronic range shift with no mechanical change necessary.

E.       Operator interface shall be NEMA 4 construction and shall have LED display and keypad configuration.

F.       Feeder shall have the capability of being paced with a 4-20 mA input signal.

G.      Underload alarm shall be provided

H.      Power input shall be 115 VAC with a maximum power consumption of 0.80 KVA

I.        Motor shall be 90VDC washdown type with 2000 max rpm.