FLOWLINE Switch Tek LZ12 Powered Liquid Level Switches User Manual

FLOWLINE Switch Tek LZ12 Powered Liquid Level Switches

ABOUT SWITCH-TEK™ POWERED LEVEL SWITCHES This manual contains information on all four models of Flowline Switch-Tek™ powered level switches; Vibration (LZ12 series), Ultrasonic (LU10 series), Optic Leak (LO10 series) and SuperGuard Capacitance (LP15 series). The switches all feature two outputs: 1) a 4 or 20 mA current switch and 2) a 60VA SPST dry contact relay. All four series are manufactured with thermoplastics, including the cable, making them submersible in design and ideal for corrosive applications. Package the switches with either Flowline controllers (LC10 or LC40 series) or interface directly to another controller or PLC.

Specifications

COMMON SPECIFICATIONS

Sensor Information

VIBRATION LEVEL SWITCH (LZ12 SERIES)
The Vibration switch operates at a nominal frequency of 400 Hz. As the switch becomes immersed in a liquid or slurry, a corresponding frequency shift occurs. When the measured frequency shift reaches the set point value, the switch changes state indicating the presence of a liquid or slurry medium. For optimum performance and proactive maintenance, the sensor automatically adjusts for coating, and if necessary, outputs a preventative maintenance alarm.

Do not squeeze the forks together. Doing so could damage or break the sensor and void the warranty. When powering up the LZ12, the start-up procedure requires the switch to cycle through a wet condition for 1/2 second in order to determine an initial resonance.

LZ12 SPECIFICATIONS

Sensor material:| Ryton® (glass fill)| Maint. alarm: Cable jacket mat’l: Cable type:| NPN transistor, 10 mA max. PP

5-conductor, #24 AWG (shielded)

---|---|---|---
 | Viton® cable grommet
Process temp.:| F: -40° to 176°
 | C: -40° to 80°

CONFIGURATIONS

Part Number

| ****

Length

| ****

Material (cable)

| Thread

cable       X    sensor side               side

---|---|---|---
LZ12-1405| Ryton| Polypropylene| ¾” NPT x ¾” NPT
LZ12-1425| Ryton| Polypropylene| ¾” R       x ¾”G

MAINTENANCE ALARM (LZ12 VIBRATION ONLY)
For optimum performance and proactive maintenance, the sensor automatically adjusts for coating, and if necessary, outputs a preventative maintenance alarm. The Yellow wire is a NPN transistor designed to switch when a build-up of material prevents the vibration switch from operating at its operational frequency. Use the Yellow wire to identify when the Vibration switch requires cleaning. To wire the maintenance output wire to an LED, follow the wiring diagram below. The Yellow wire is connected to the LED and a 2.2kΩ resistor in series and referenced back to the (+) of the power supply.

Sensor Power
[RED & BLK wires] / 36 VDC Max. 5 ±1mA Dry / 22 ±1mA Wet

Relay Rating
[GRN & WHT wires] / 60 VA

Maintenance Alarm
[YEL wire] / NPN Transistor / 10mA Max.

To wire the maintenance output wire to a PLC, follow the wiring diagram below. The Yellow wire is connected to the PLC input with a 10 kΩ resistor parallel to the PLC input and the (+) of the power supply

Sensor Power
[RED & BLK wires] / 36 VDC Max. 5 ±1mA Dry / 22 ±1mA Wet

Relay Rating
[GRN & WHT wires] / 60 VA

Maintenance Alarm
[YEL wire] / NPN Transistor / 10mA Max.

ULTRASONIC LEVEL SWITCH (LU10 SERIES)
The Ultrasonic switch generates a 1.5 MHz ultrasonic wave from a miniature piezoelectric transducer located on one side of the gap within it’s sensing tip. Another piezo transducer, located on the other side of the gap, acts as a microphone, picking up the sound wave. When liquid enters the gap, there is a change in the speed the wave crosses the gap. This change in the speed of sound identifies whether the sensor is in liquid or in air.

The sensor should be installed so that the liquid will drip out of the gap when the sensor becomes dry

LU10 SPECIFICATIONS

= 300
Approvals:             CSA: Class I, Groups A,|  | mA, Pmax = 1.3 W; Ci = 0 µF, Li
B, C & D; Class II, Groups|  | = 0 µH
E, F and G; Class III|  | EEx: Ui = 32V; Ii = 300 mA; Pi =
EEx: Class 1, Division 1,|  | 1.3 W; Ci = 0 µF; Li = 0 µH
Groups A, B, C, D; EEx ib| Certificates:| CSA: LR 79326
IIC T6|  | EEx: LCIE 01.E6048 X

CONFIGURATIONS

Part Number

| ****

Length

| ****

Material (body)

| ****

Material (cable)

| Thread

cable side

| ****

X

| ****

sensor side

---|---|---|---|---|---|---
LU10-1305| Short (3”)| Polypropylene| Polypropylene| (¾” NPT) x| (¾” NPT)
LU10-1325| Short (3”)| Polypropylene| Polypropylene| (¾” R)| x| (¾”R)
LU10-1405| Long (4.5”)| Polypropylene| Polypropylene| (¾” NPT) x| (¾” NPT)
LU10-1425| Long (4.5”)| Polypropylene| Polypropylene| (¾” R)| x| (¾”G)
LU10-2305| Short (3”)| PFA| PFA| (¾” NPT) x| (¾” NPT)
LU10-2325| Short (3”)| PFA| PFA| (¾” R)| x| (¾”R)
LU10-2405| Long (4.5”)| PFA| PFA| (¾” NPT) x| (¾” NPT)
LU10-2425| Long (4.5”)| PFA| PFA| (¾” R)| x| (¾”G)

OPTIC LEAK DETECTION SWITCH (LO10 SERIES)
The Optic switch use principles of optical refraction to detect the presence or absence of fluid. A pulsed infrared light beam is internally generated by a light emitting diode and aimed at the slanted optical tip of the sensor. If the tip is dry, the light beam bounces at a 90 degree angle to a receiving photo transistor, indicating a dry condition. If the tip is immersed in liquid, the light beam will refract out into the liquid instead of being reflected to the photo transistor, indicating a wet condition. The LO10 series is designed as a leak detection switch. The switch should be installed in applications where under normal conditions, it remains away from the liquid and will only come into contact during a leak. The Optic Leak Detector cannot detect the presence or absence of specular application liquids that reflect light (such as milk), or viscous liquids (such as paint) that form a coating on the sensor tip.

LO10 SPECIFICATIONS

Sensor material: 1_ 5: PP 2 5: PFA Cable jacket mat’l: 1 5: PP 2 _5: PFA

CONFIGURATIONS

Part Number

| ****

Length

| ****

Material (body)

| ****

Material (cable)

| Thread

cable side

| ****

X

| ****

sensor side

---|---|---|---|---|---|---
LO10-1305| Short (3”)| Polypropylene| Polypropylene| (¾” NPT) x| (¾” NPT)
LO10-1325| Short (3”)| Polypropylene| Polypropylene| (¾” R)| x| (¾”R)
LO10-1405| Long (4.5”)| Polypropylene| Polypropylene| (¾” NPT) x| (¾” NPT)
LO10-1425| Long (4.5”)| Polypropylene| Polypropylene| (¾” R)| x| (¾”G)
LO10-2305| Short (3”)| PFA| PFA| (¾” NPT) x| (¾” NPT)
LO10-2325| Short (3”)| PFA| PFA| (¾” R)| x| (¾”R)
LO10-2405| Long (4.5”)| PFA| PFA| (¾” NPT) x| (¾” NPT)
LO10-2425| Long (4.5”)| PFA| PFA| (¾” R)| x| (¾”G)

CAPACITANCE LEVEL SWITCH (LP15 SERIES)
The Capacitance level switch generates a pulse-wave radio frequency signal from the capacitance electrode located in the sensing tip of each sensor. When liquid comes into contact with the sensing tip, the capacitance as measured by the sensor changes based on the dielectric constant of the liquid. The guard circuit rejects the negative effects of coating buildup on the probe by eliminating the coating signal path between the active and reference electrodes.

The sensor’s operation may vary based on the dielectric properties of various application liquids. The LP15 series sensor is factory-calibrated to be used with liquids with a dielectric value between 20 and 80. Liquids with a dielectric constant less than 20 will not be detected by an LP15 series sensor.

TABLE OF COMMON DIELECTRIC CONSTANTS

Note : Liquids with a dielectric constant less than 20 will not be detected by an LP15 series level switch

• Acetone ………………… 21
• Acetoaldehyde …….. 22.2
• Acetyl methyl hexyl
• ketone …………………… 28
• Alcohol ………….. 16 to 31
• Ammonia ………. 15 to 25
• Acetic acid …… 4.1 to 6.2
• Butyl chloride ………… 9.6
• Barium chloride … 9 to 11
• Benzene ………………. 2.3
• Benzine ………………… 2.3
• Barium nitrate ……….. 5.6
• Bromine ……………….. 3.1
• Chlorobenzene .. 4.7 to 6
• Chlorotoluene ……….. 4.7
• Chloroform …… 4.5 to 5.0
• Chlorine, liquid ………. 2.0
• Carbon tetrachloride . 2.2
• Cyan ……………………. 2.6
• Cyclohexane methanol ……………………………. 3.7
• D.I. Water ……………… 20
• Ethyl toluene …………. 2.2
• Ethyl alcohol ………….. 23
• Ethylene glycol ………. 37
• Ethylene oxide ……….. 14
• Ethylene dichloride …………………….. 11 to 17
• Ethylene chloride ….. 10.5
• Ethyl acetate ………….6.4
• Ethyl salicylate ……….8.6
• Ethyl stearate …………2.9
• Ethyl silicote …………..4.1
• Formic acid …………… 59
• Ferric oleate …………..2.6
• Freon ……………………2.2
• Glycerine ………………. 47
• Glycol …………………… 30
• Glycol nitrite ………….. 27
• Gasoline …………. 2 to 2.2
• Hydrochloric acid …….4.6
• Isobutyric acid ………..2.7
• Isobutyl methyl ketone …………………………….. 13
• Jet fuel …………………. 1.7
• Lead carbonate ………. 18
• Lead nitrate ……………. 38
• Methyl salicylate ……. 9.0
• Methanol ……………….. 33
• Methyl alcohol … 33 to 38
• Margarine, liquid …………………… 2.8 to 3.2
• Methyl acetate ………. 7.3
• N-butyl formate ……… 2.4
• Nitrobenzene …. 26 to 35
• Nitrotoluene …………… 25
• Naphthalene … 2.3 to 2.5
• Oils, vegetable 2.5 to 3.5
• Oils, mineral … 2.3 to 2.4
• Oils, petroleum …………………… 1.8 to 2.2
• Oleic acid …………….. 2.5
• Propane, liquid …………………… 1.8 to 1.9
• Potassium nitrate …………………… 5.0 to 5.9
• Potassium chloride … 5.0
• Stearic acid ………….. 2.3
• Toluene ……………….. 2.4
• Trichloroethylene …… 3.4
• Trichloroacetic acid … 4.5
• Terephthalic acid ……………………. 1.5 to 1.7
• Thinner …………………. 3.7
• Urea …………………….. 3.5
• Vinyl chloride …… 2.8 to 6
• Vinyl alcohol …. 1.8 to 2.0
• Water, 20°C …………… 80
• Water, 100°C …………. 48

Note : Reference a website such as http://www.flowline.com for further dielectric information.

CONFIGURATIONS

Part Number

| ****

Material (body)

| ****

Material (cable)

| Thread

cable       X    sensor side               side

---|---|---|---
LP15-1405| Polypropylene| Polypropylene| (¾” NPT) x (¾” NPT)
LP15-1425| Polypropylene| Polypropylene| (¾” R)      x (¾”G)

Safety Precautions

• About Manual : PLEASE READ THE ENTIRE MANUAL PRIOR TO INSTALLING OR USING THIS PRODUCT. This manual includes information on all models of Flowline Switch-Tek™ Powered Level Switches: LZ12, LU10, LP15 and LO10 series. Please refer to the part number located on the sensor label to verify the exact model which you have purchased.
• User’s Responsibility for Safety : Flowline® manufactures a wide range of liquid level switches and technologies. While each of the these switches are designed to operate in a wide variety of applications, it is the user’s responsibility to select a switch model that is appropriate for the application, install it properly, perform tests of the installed system, and maintain all components. The failure to do so could result in property damage or serious injury.
• Proper Installation and Handling : Because this is an electrically operated device, only properly trained staff should install and/or repair this product. Use a proper sealant with all installations. Note: Always install the 3/4” Viton gasket with all versions of Switch-Tek™ with metric threads. The G threaded version will not seal unless the gasket is properly installed. Never over tighten the sensor within the fitting, beyond a maximum of 80 inch-pounds torque. Always check for leaks prior to system start-up.
• Material Compatibility : The LU10 and LO10 series sensors are available in two different wetted materials. Models L_10-1__5 are made of Polypropylene (PP). Models L_10-2__5 are made of Perfluoroalkoxy (PFA). The LZ12 series is made of made of Ryton® (40% glass filled) and the LP15 series is made of PP. Make sure that the model you have selected is compatible with the application liquid. To determine the chemical compatibility between the sensor and its application liquids, refer to an industry reference such as the Compass Corrosion Guide (available from Compass Publications).
• Wiring and Electrical : The supply voltage used to power the sensor should never exceed a maximum of 36 volts DC (30 VDC for LZ12 series). Electrical wiring of the sensor should be performed in accordance with all applicable national, state, and local codes.
• Flammable, Explosive and Hazardous Applications : Only the LU10-___5 series switch is rated for use in hazardous locations. Refer to the Certificate of Compliance for all applicable intrinsically safe ratings and entity parameters. Refer to the National Electric Code (NEC) for all applicable installation requirements in hazardous locations. DO NOT USE THE LZ12, LP15 OR LO10 SERIES GENERAL PURPOSE SWITCH IN HAZARDOUS LOCATIONS.

Warning
The rating for the relay is 60 VA (125 VAC max / 1A max). Flowline’s Switch-Tek™ level switches are not recommended for use with electrically charged application liquids. For most reliable operation, the liquid being measured may need to be electrically grounded. Always install the 3/4” Viton gasket with all versions of the powered sensors with metric threads. The G threaded version will not seal unless the gasket is installed properly.

MAKE A FAIL-SAFE SYSTEM
Design a fail-safe system that accommodates the possibility of switch and/or power failure. FLOWLINE recommends the use of redundant backup systems and alarms in addition to the primary system. Adding a redundant high level float switch to the system is a cost effective means to prevent costly tank overflows. Switch-Tek™ level and leak switches have a single internal relay. The normally open (NO) or normally closed (NC) operation is user selected based on the desired system control. Always design a fail-safe system that accommodates for the possibility of functional and/or power failure to the instrument. The “normal” relay state is where the relay coil is de-energized and the relay indicator is OFF. Therefore, if power is cut OFF to the switch it will de-energize the relay. Make sure that the de-energized state is the safe state in your system design. As such, if switch power is lost, a pump will turn OFF if it is connected to the normally open side of the relay.

Installation

THROUGH WALL INSTALLATION
Switch-Tek™ level switches may be installed through the top, side or bottom of a tank wall. The sensor has male 3/4″ NPT threads on either side of a 15/16″ wrench flat. This enables the user to select the sensor’s mounting orientation, installed outside of the tank in, or inside of the tank out.

Always install the 3/4” Viton gasket with the metric (long sensor length) versions of the L - 2. The G threaded version of the Switch-Tek™ will not seal unless the gasket is installed properly.

TOP WALL INSTALLATION
Switch-Tek™ level switches may be installed through the top wall of a tank. Flowline’s Smart Trak LM10 series mounting system is an in-tank fitting which enables users to install up to four FLOWLINE sensors of any technology, to any depth, along the entire length of track. Smart Trak may be installed through the top wall of any tank using a standard 2″ NPT tank adapter. If no tank top installation is available, Flowline’s side mount bracket, LM50-1001, enables Smart Trak to be installed directly to the side wall of a tank. Do not use PFA Teflon sensors with Smart-Trak. Flowline’s Switch Pak LM45 series mounting system is an in-tank fitting which enables users to install one FLOWLINE sensor, of any technology, to a specific depth. The Flowline sensor may be installed onto the 3/4″ NPT adapter at the end of the Switch Pak. Switch Pak may be installed through the top wall of any tank using a standard 2″ NPT tank adapter. Flowline’s side mount bracket, model LM50-1001, may also be used if top wall installation is not available.

Electrical

SUPPLY VOLTAGE
The supply voltage to the Switch-Tek™ level switch should never exceed a maximum of 36 VDC. Flowline controllers have a built-in 13.5 VDC power supply which provides power to all of Flowline’s electrically powered sensors. Alternative controllers and power supplies, with a minimum output of 12 VDC up to a maximum output of 36 VDC (30 VDC with LZ12 series), may also be used with the Switch-Tek™ level switch.

REQUIRED CABLE LENGTH
Determine the length of cable required between the Switch-Tek™ level switch and its point of termination. Allow enough slack to ensure the easy installation, removal and/or maintenance of the sensor. The cable length may be extended up to a maximum of 1000 feet, using a well-insulated, 14 to 20 gauge shielded four conductor cable.

WIRE STRIPPING
Using a 10 gauge wire stripper, carefully remove the outer layer of insulation from the last 1-1/4″ of the sensor’s cable. Unwrap and discard the exposed foil shield from around the signal wires, leaving the drain wire attached if desired. With a 20 gauge wire stripper, remove the last 1/4″ of the colored insulation from the signal wires.

SIGNAL OUTPUTS (CURRENT SENSING)
The standard method used by Flowline controllers; this technology uses only two wires (Red and Black). The sensor draws 5 mA when it is dry and 22 mA when wet. NC/NO status must be set by the controller. The White and Green wires are not used.

SIGNAL OUTPUT (RELAY SWITCHING)
Allows the sensor to switch a small load on or off directly, using an internal 1A relay (60 VAC/60 VDC). The relay and features 4 wires (red, black, white and green) and a shield wire. The NO/NC status is set by the polarity of the voltage feeding the red and black wires. The green wire is the common for the relay and the white wire is the NO or NC, depending on the polarity of red and black.

NORMALLY OPEN WIRING

NORMALLY CLOSED WIRING

Wiring

WIRING TO A FLOWLINE CONTROLLER
LC40 Series Controller (4 or 20 mA output): LC42-1001 Shown

LC10/LC11 Series Controller (4 or 20 mA output): LC11-1001 Shown

SWITCHING INDUCTIVE LOADS
The use of suppressors (snubbers) is strongly recommended when switching inductive loads to prevent disrupting the microprocessor’s operation. The suppressors also prolong the life of the relay contacts. Suppression can be obtained with a catch diode for DC circuits and a resistor-capacitor (RC) for AC circuits.

Catch Diode
Always use stepper relays between the sensor and external loads. For DC circuits use a catch diode such as 1N4148, shown on left.

Refer to the following circuits for RC network assembly and installation:

Choose R and C as follows:

• R : 0.5 to 1 Ohms for each volt across the contacts
• C : 0.5 to 1 μF for each amp through closed contacts

Notes:

1. Use capacitors rated for 250 VAC.
2. RC networks may affect load release time of solenoid loads. Check to confirm proper operation.
3. Install the RC network at the meters relay screw terminals. An RC network may also be installed across the load. Experiment for best results.

Wiring

WIRING THE RELAY OUTPUT
Switch-Tek™ requires 12 – 36 VDC (30 VDC max. for LZ12 series) power to operate the sensor and switch the relay. All illustrations below identify a Dry switch state as the normal position of the relay

Switching a Normally Open DC Load
The Red wire connects to Positive (+) of the power supply and the Black wire connects to Negative (-). The LOAD can be attached to either the Green or White wires. Complete the circuit by connecting the Green to (+) VDC power or White to (-) VDC power (see illustration below).

Sensor Power
[RED & BLK wires] / 36 VDC Max. 5 ±1mA Dry / 22 ±1mA Wet

Switching a Normally Closed DC Load
The Black wire connects to Positive (+) of the power supply and the Red wire connects to Negative (-). The LOAD can be attached to either the Green or White wires. Complete the circuit by connecting the Green to (+) VDC power or White to (-) VDC power (see illustration below).

Relay Rating
[GRN & WHT wires] / 60 VA

Switching a Normally Open AC Load
The Red wire connects to Positive (+) of the DC power supply and the Black wire connects to Negative (-). The LOAD can be attached to the Green wire and the Hot of the VAC power. Connect the White to the Neutral of the VAC power (see illustration below).

Sensor Power
[RED & BLK wires] / 36 VDC Max. 5 ±1mA Dry / 22 ±1mA Wet

Switching a Normally Closed AC Load
The Black wire connects to Positive (+) of the DC power supply and the Red wire connects to Negative (-). The LOAD can be attached to the Green wire and the Hot of the VAC power. Connect the White to the Neutral of the VAC power (see illustration below).

Relay Rating
[GRN & WHT wires] / 60 VA

LU10- _ 5 ULTRASONIC LEVEL SWITCH ONLY
The LU10- 5 level switch has been approved for use in Class I, Groups A, B, C & D; UNDER CERTIFICATE NUMBER LR 79326-4. DO NOT USE THE LZ12, LP15 or LO10 SERIES IN INTRINSICALLY SAFE APPLICATIONS. The Entity parameters for the LU10- _ _5 are: Vmax = 32 VDC / Imax = 0.5 A / Ci = 0 μF / Li = 0 mH

INTRINSICALLY SAFE CONTROL DRAWING

Notes:

1.  CSA certified associated equipment with entity parameters.
2. Vmax 3 Voc, Imax 3 Isc, Ci + C cable £ Ca., Li +L cable £ La.
3. Installation should be in accordance with CEC Part 1, or NFPA 70.
4. Associated equipment must be installed per manufacturers instruction

WIRING TO A FLOWLINE CONTROLLER
LC90 Series Controller (4 or 20 mA Signal Output)

The LU10- 5 level switch has been approved for use in Class I, Division 1, Groups A, B, C & D; EEx ib IIC T6; UNDER CERTIFICATE NUMBER LCIE 01.E6048X. DO NOT USE THE LZ12, LP15 or LO10 SERIES IN INTRINSICALLY SAFE APPLICATIONS. The Entity parameters for the LU10- 5 are: North America – Vmax = 32 VDC / Imax = 0.5 A / Pmax = 1.3 W / Ci = 0 μF / Li = 0 μH Europe – Ui = 32 VDC / Ii = 0.5 A / Pi = 1.3 W / Ci = 0 μF / Li = 0 μH

INTRINSICALLY SAFE CONTROL DRAWING

Notes: PARAMETERS DEPEND ON OUTPUT TYPE

1. Installation should be in accordance with CEC Part 1, or NFPA 70.
2. Associated Equipment shall be CSA certified with entity parameters connected in accordance with manufacturers instructions.

WIRING AS A P-CHANNEL OR N-CHANNEL OUTPUT
Switch-Tek™ level switch can be substituted for either a P-Channel (PNP, sourcing) output or an N-Channel (NPN, sinking) output

Normally Open DC Load as a P-Channel Output
The Red wire connects to Positive (+) of the power supply and the Black wire connects to Negative (-). The Green wire is jumped to the Red wire while the White wire is connected to the LOAD. Jumper the LOAD to the Negative (-) to complete the circuit

Sensor Power
[RED & BLK wires] / 36 VDC Max. 5 ±1mA Dry / 22 ±1mA Wet

Normally Closed DC Load as a P-Channel Output
The Black wire connects to Positive (+) of the power supply and the Red wire connects to Negative (-). The Green wire is jumped to the Black wire while the White wire is connected to the LOAD. Jumper the LOAD to the Negative (-) to complete the circuit.

Relay Rating
[GRN & WHT wires] / 60 VA

Normally Open DC Load as a N-Channel Output
The Red wire connects to Positive (+) of the power supply and the Black wire connects to Negative (-). The White wire is jumped to the Black wire while the Green wire is connected to the LOAD. Jumper the LOAD to the Positive (+) to complete the circuit.

Sensor Power
[RED & BLK wires] / 36 VDC Max. 5 ±1mA Dry / 22 ±1mA Wet

Normally Closed DC Load as a N-Channel Output
The Black wire connects to Positive (+) of the power supply and the Red wire connects to Negative (-). The White wire is jumped to the Red wire while the White wire is connected to the LOAD. Jumper the LOAD to the Positive (+) to complete the circuit.

Relay Rating
[GRN & WHT wires] / 60 VA

Maintenance

GENERAL
Switch-Tek™ level switches may require periodic cleaning to eliminate coating build-up. It is the responsibility of the user to determine the appropriate maintenance schedule, based on the specific characteristics of the application liquids.

CLEANING PROCEDURE

1. Power : Make sure that all power to the switch, controller and/or power supply is completely disconnected.
2. Switch removal : In all through-wall installations, make sure that the tank is drained well below the sensor prior to removal. Carefully, remove the sensor from the installation.
3. Cleaning the switch : Use a soft bristle brush and mild detergent, carefully wash the Switch-Tek™ level switch. Do not use harsh abrasives such as steel wool or sandpaper, which might damage the surface sensor. Do not use incompatible solvents which may damage the sensor’s PP, PFA, PVDF or Ryton plastic body.
4. Sensor installation : Follow the appropriate steps of installation as outlined in the Installation section of this manual.

MAINTENANCE OUTPUT TO LED (LZ12 ONLY)
To wire the maintenance output wire to an LED, follow the wiring diagram below. The Yellow wire is connected to the LED and a 2.2kΩ resistor in series and referenced back to the (+) of the power supply.

Sensor Power
[RED & BLK wires] / 36 VDC Max. 5 ±1mA Dry / 22 ±1mA Wet

Relay Rating
[GRN & WHT wires] / 60 VA

Maintenance Alarm
[YEL wire] / NPN Transistor / 10mA Max

TESTING THE INSTALLATION

1. Power : Turn on power to the controller and/or power supply.
2. Immersing the switch : Immerse the sensing tip in its application liquid, by filling the tank up to the switches point of actuation. An alternate method of immersing the switch during preliminary testing is to hold a cup filled with application liquid up to the switch’s tip.
3. Test : With the switch being fluctuated between wet and dry states, the switch indicator light in the controller should turn on and off. If the controller doesn’t have an input indicator, use a voltmeter or ammeter to ensure that the switch produces the correct signal (see below).
4. Point of actuation : Observe the point at which the rising or falling fluid level causes the switch to change state, and adjust the installation of the switch if necessary.

Example : Testing the LU10 series with a Multimeter set to read current (mA). When wired NO [Red to (+)], the meter will read 5mA, ±1mA when dry and will read 20mA, ±1mA when wet.

Example : Testing the LU10 series with a multimeter set to read resistance (ohms). When wired NO [Red to (+)], the meter will read O.L when dry and will read some small amount of resistance (ex. 0.2 Ohms) when wet.

1.888.610.7664 www.calcert.com sales@calcert.com

References

• Calcert
• Flowline Level Sensor, Transmitter, Switch & Control | We design and manufacture reliable level measurement and control solutions for your chemical, water, wastewater, oil and dry solid applications. We do your level best.

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