Kenco Engineering KUST Switch User Manual

KENCO ENGINEERING COMPANY

Sensor Length

Process Connection

Flange Size

Flange Material

Input Power

Output

P.O. BOX 470426 TULSA, OK 74147-0426 ● PHONE: [phone] FAX: [phone]

www.kenco-eng.com e-mail: [e-mail]

MODEL KUST ULTRASONIC SWITCH

INSTALLATION / OPERATION INSTRUCTIONS

GENERAL DESCRIPTION

The KUST Series Ultrasonic Level Switches are ideal, low cost solutions for many liquid level control applications. They
operate in a wide variety of services.

PRINCIPLE OF OPERATION

Ultrasonic switches use piezoelectric crystals to transform electrical energy into mechanical motion (sound). The
Transmit Crystal sends a pulse of sound through the space between the crystals, to the Receive Crystal. If the space is
filled with air, gas, or vacuum, the Receive Crystal does not detect the sound pulse. However, if the space is filled with
liquid, any liquid, the pulse is detected by the Receive Crystal, and the switch output changes.

MODEL DESCRIPTION

Input Power

Output

Switch Mounting

Sensor Material

Sensor Length

Process Connection

Flange Size

KUST - - - - - - - -

Flange Material

Description Code Description Code Description Code Description Code

Standard (2.25”) 00 ¾” NPT 1 None None
*Inches (3” – 120”) xxx 150# Flange F 1-1/2” 0 Carbon Steel A
*316SS Sensor Only 300# Flange H 1 1 316SS S
Sanitary Flange S 2 2
3 3

INSTALLATION

Unpack the switch carefully. Inspect all units for damage. Report any damage to carrier immediately. Check the
contents against the packing slip and purchase order.

Kenco’s Ultrasonic Switches are manufactured to the highest quality standards. These switches use electronic
components that can be damaged by static electricity. Make sure that you are properly grounded before starting
installation. Insure that all electrical connections are properly made, and that there are no “floating” connections.

Description Code Description Code

115Vac 1 10A DPDT 1
230Vac 2 Two-wire 2
24Vdc 3
12Vdc 4

Switch Mounting Sensor Material

Description Code Description Code

Integral 1 316SS S
*Remote 2 Tefzel® T

*Remote 10ft. (std.)

100ft. (max)

Operational Check

DO NOT

vertical allowing

Vessel Wall

Before installing the switch a simple operational check should be performed, as follows:

1. Fill a container with water

2. Open the electronics housing cover and connect power (see section on “Wiring”).

3. Set the Fail Safe jumper to the LLFS position (lower two pins).

4. Apply power

5. Place the sensor gap into the water.
a. Relay Version -- The relay will energize (the contacts between (NC) and (C) should open).
b. 2-wire Version -- The current in the Positive lead will be 20.0mA.

6. Remove the sensor from the liquid.
a. Relay Version – The relay will de-energize (the contacts between (NC) and (C) should close).
b. 2-wire Version – The current in the Positive lead will be 4.0mA.

7. Disconnect the wiring.

Mounting

For threaded process connections, screw sensor into the opening using a wrench on the sensor mounting nut flats. Use
thread tape or suitable pipe compound on the threads. If flanged, bolt the sensor to the mating flange with the proper
gasket.

The sensor gap must protrude into the vessel / pipe being measured. The sensor will not function properly if the detection
tip is in a nozzle. See the following drawings for mounting guidelines:

housing to
tighten sensor

use

Use wrench here

¾” NPT

Turn slot

media to fall
through

Slot must
extend at least
1” (25mm)
beyond end of
nozzle

Wiring

It is recommended that conduit be installed onto the ¾” NPT connection on the electronics housing. A seal drain fitting
should be used to prevent moisture from entering the switch. All wiring, conduit, and electrical fittings must conform to
local electrical codes for the location selected. If the switch is to be used in a Hazardous Area, the applicable codes of the
National Electrical Code must be followed as well.