8

51-650 Echotel SIL Safety Manual

5.5.1 Hygienic-Specific Installation

The hygienic version of the Model 961 is available with a

deep-drawn 304 stainless steel housing. A variety of hygienic

process connections are offered for use in food and beverage,

pharmaceutical, and biotechnology applications. These

hygienic transducers have 3-A (Authorization #596), EHEDG

certification (per TNO Report # V4772/01) and a 20 Ra

finish providing a uniform and ultra-smooth surface that

inhibits microbial growth. Electron beam welding technology

is utilized to facilitate a crevice-free surface inside the trans-

ducer tip. This allows these transducers to be used in a wide

variety of hygienic applications where CIP (clean-in-place) is

used to remove any contamination from the transducer surface.

5.5.2 Pump-Specific Installation

A DIP switch on the Model 962 allows it to be configured

to control level, or to function as a pump controller. In the

pump control mode the unit can perform auto-fill or auto-

empty of tanks, sumps, or wet wells. The tip sensitive lower

from the bottom of the vessel. The rigidity of the flow

through upper gap allows the Model 962 to be used even

when sumps experience severe turbulence from vessel fill lines.

5.6

Configuration

Refer to Section 2.5 in the Echotel Model 961/962

Ultrasonic Single and Dual Point Level Switches Installation

and Operating Manual (Bulletin 51.646) for complete

configuration instructions.

5.6.1 Time-Delay Potentiometer

The time-delay potentiometer is used in applications where

turbulence or splashing may cause false level alarm. The

response time can be adjusted from factory-set standard of

0.5 seconds to a maximum of 45 seconds. The time-delay

potentiometer is an option for both Model 961 and Model 962

in either line-powered or loop-power configuration.

5.6.2 Level Test Push Button

The level test push button is used to manually test the

DPDT process level relay and whatever is connected to the

relay. Pressing this push button reverses the state of the

DPDT relay from engaged to de-engaged, or vise-versa.

The level test push button is an option for both Model 961

and Model 962 in line-powered configuration only.