K-TEK RS80, RS85 Operation Manual
RS80 RS85
RS80-0200-1 Rev d (10-2010) DCN0533
1.0 Introduction ............................................................................................................. 3
1.1 Description ....................................................................................................... 3
1.2 Theory of Operation ......................................................................................... 3
1.3 Specifications .................................................................................................... 3
1.4 Sample Applications ......................................................................................... 4
2.0 Installation .............................................................................................................. 5
2.1 Mounting ........................................................................................................ 5-8
2.2 Integral and Remote Units ................................................................................ 8
2.3 Cautions ............................................................................................................ 8
3.0 Setup ...................................................................................................................... 9
3.1 Accessing Setup Adjustments .......................................................................... 9
3.2 Density - Setpoint Adjustment - High (RS80 only) .......................................... 10
3.3 Density - Setpoint Adjustment - Low (RS80 only) ........................................... 11
3.4 Fail Safe / Relay Operation (RS80/RS85) ...................................................... 12
3.5 Fault Mode ..................................................................................................... 12
4.0 Troubleshooting .................................................................................................... 13
5.0 Appendix A (RS85 Only Setup) ............................................................................ 14
5.1 Density Adjustment - Precise Density Setpoint Adjustment (RS85 only) ... 14-15
5.2 Time Delay (RS85 only) ................................................................................. 16
5.3 Factory Default Settings / Reset (RS85 only) ................................................ 17
5.4 Loop Powered Alarm (RS85 only) .................................................................. 18
6.0 Appendix B .......................................................................................................... 19
6.1 FM Approval on 120 VAC or 240 VAC Installations ...................................... 19
7.0 Remote Assembly ................................................................................................ 20
8.0 Warranty Statement ............................................................................................. 21
9.0 Customer Support ................................................................................................ 22
9.1 K-TEK RMA Form.......................................................................................... 23
Table of Contents
RS80-0200-1 Rev d (10-2010) DCN0533 3
1.0 Introduction
1.1 Description
The Resonator™ Switch is a vibrating fork switch designed for level detection in liquids. The robust sensor design and
built-in temperature compensation ensure reliable response even in the presence of very extreme process conditions.
The LED indicators of the Resonator’s modular electronics allow for simple set-up and status detection via pushbuttons or a single magnet. Its rugged construction allows it to withstand the rigors of just about any industrial environment. The Resonator switch is available in two different models: (1) RS80 - base model or (2) RS85 - multi-options
model.
1.2 Theory of Operation
The Resonator vibrating switch utilizes a piezoelectric driven tuning fork that exhibits a change in resonant frequency
when immersed in any liquid. “Smart” microprocessor-based electronics keeps the sensor in a resonant state as it
changes from dry to wet or wet to dry. The resonant frequency is continuously monitored for changes created by a
wet or dry sensor and an alarm is provided via a relay. An important feature of this device is that its resonant frequency is not significantly affected by coating on the fork unless the space between the forks is bridged. The RS80/
RS85’s ability to identify true liquid level in viscous, coating or aerated liquid is unparalleled. The self-test option continuously checks for fault conditions such as a damaged sensor and under fault conditions displays a blinking red LED
visible through the glass cover. Applications include redundant high/low liquid level and are unaffected by parameters
such as specific gravity, dielectric constant or mounting position of the sensor.
1.3 Specification
For detailed specifications consult the RS80/85 data sheet.
Standard Outline Dimensions
3/4” (19mm)
FNPT
Conduit
3/4” (19mm)
MNPT
Standard
4 3/8”
11” (279mm)
Standard
PL*
*Trip Point 3/4” from end
DIMENSIONS
RS80-0200-1 Rev d (10-2010) DCN0533
1.4 Sample Applications
The Resonator™ can be used for level detection in tanks, vessels or piping containing all types of hot or cold liquids
and is suitable for high/low applications in hazardous areas. The Resonator can be mounted in any orientation. In
vertical applications where room allows, the unit can be extended into the vessel (up to 115”) with an extension tube.
The Resonator™ (RS85 only) is also available with Teflon coatings or alloy wetted parts for use in corrosive fluid
and sticky applications.
Resonator dual
compartment housing and
custom insertion length
Resonator switches
mounted in KM26
Magnetic Level Gauge
Resonator switches
mounted in External
Chamber
Empty Pipe
Detection
Level in
Vertical Pipe
RS80-0200-1 Rev d (10-2010) DCN0533 5
2.0 Installation
2.1 Mounting
After unpacking the unit, inspect it for any evidence of shipping damage. Any claims for damage due to shipping
must be filed with the carrier who handled the package(s).
• Select a mounting location for the switch and the sensor probe. Your unit may be an integral mounting option or the
remote mounting option. The integral mounting unit consists of a single enclosure that includes the electronic module
and the sensor probe. The remote mounting unit consists of two enclosures, one containing the electronic module
and the other containing the sensor probe.
• Be sure that there is sufficient clearance around the mounting position to allow for the turning radius of the switch
or remote sensor enclosure as the unit is screwed into place. Allow sufficient room above the vessel entry to be able
to insert the probe into the opening of the vessel.
• The thread size of the vessel coupling should be 3/4" NPT for most probes. Certain special applications may utilize
couplings of different sizes.
• The information included on the label should be visible. If necessary clean the label using a cloth soaked with either
water or isopropyl alcohol.
2.1.2 Switchpoint and Mounting Position
Switchpoints on the sensor depend on the mounting position. Because the Resonator requires no calibration, the
switchpoint is determined by the position of the tuning fork.
Note: When used in extremely light liquids (liquefied gas), select the low density Setpoint adjustment.
Top Mounted Bottom Mounted
Side Mounted
2.1.1 Flush Tank Mounting
The Resonator can be flush mounted for high or low level indication using a flange or the standard ¾” connection.
Resonator
mounted via
¾” NPT connector
RS80-0200-1 Rev d (10-2010) DCN0533
2.1.3 Mounting for Vessel Wall Build-up
If there is a potential for build-up on the vessel wall, mount the Resonator with sufficient distance between the wall
and the fork assembly to prevent bridging.
* Ensure that there is sufficient distance between the build-up expected on the tank and the forks.
Vertical Top Mounted
Extended into Vessel, Side Mounted
2.1.4 Extended Probe Lengths
The sensor length “PL” for the Resonator (model number) will differ based on the process connection. A threaded
sensor PL is measured from the bottom process thread to the tip of the fork tine. A flanged sensor PL is measured
from the face of the flange to the tip of the fork tine.
2.1.5 Mounting Position with Extension Tubes
If ordering the Resonator with an extended probe length, ensure there is adequate space between outside walls or
ceilings and the vessel mounting point
A short extended probe length (up to 20 inches) can be mounted in any orientation. A Resonator with an extended
probe length over 20 inches (up to 120”) must be mounted vertically.
*
RS80-0200-1 Rev d (10-2010) DCN0533 7
2.1.7 Mounting for Low Viscosity Liquids
Mounting positions for low viscosity liquids are shown below. If the Resonator fork is nozzle mounted with a flange
and does not extend beyond the wall of the vessel, a minimum nozzle diameter of 2” is required. If mounted into a
threaded nozzle, forks should protrude past the wall of the vessel.
* Deburr the nozzle surfaces
2.1.6 Mounting for High Viscosity Liquids
High viscosity liquids require proper mounting to ensure accurate, repeatable service. With high viscosities, the optimum mounting is vertical from the vessel top or horizontal (flush mounted from the side).
Note: Horizontal mounting: Position the forks so that the narrow edge of the tines are vertical. This ensures that
the liquid or gelatinous process can run off easily.
Vertical Top Mounted Flush Side Mounted
2.1.8 Pipe Mounting and Empty Pipe Detection
The Resonator can be mounted into pipe lines of 2” and larger diameters. Installation into a 1” pipe line is possible
using a 1” tee (1 x 3/4” reducer fitting).
Note: To avoid blockage of the flowing material, ensure narrow edge of forks is parallel with pipe walls.
To maintain optimum performance in flow or no flow applications, the liquids should have low viscosities and low flow velocities.
Empty Pipe Detection
*
RS80-0200-1 Rev d (10-2010) DCN0533
When making the opening in the vessel, observe all safety requirements of the
area in which the work is being done. Be especially careful when working with
pressure vessels.
The Model RS80/RS85 unit may not work properly if:
The material viscosity is above 30,000 cps.
There is a conductive bridge between the paddles of the fork.
The fork tines are not in vertical position.
There is a high turbulence level
Probe is located near a material fill line.
Probe is mounted improperly.
The Model RS80/RS85 unit may be damaged if:
Temperature in the housing exceeds appropriate limits.
The process temperature exceeds probe’s operating limits.
The electronic module is subjected to excessive vibration or shock.
Vessel pressure exceeds process operating pressure rating of probe.
Probe is located near a material fill line.
If any of the above statements apply to your application, do not install the switch until you contact your local representative or the K-TEK factory for further instructions.
2.2 Integral and Remote Units
Integral units
Install the switch into the vessel coupling and connect conduit between the switch and the power supply
source as required.
Be sure the conduit is suitable for the environment in which the units are to be used.
Remote units (RS85 only)
Install the remote sensor probe into the vessel coupling. Select a suitable location for the instrument housing
that allows convenient access for calibration and meets environmental conditions of the unit.
Connect conduit between the remote sensor housing and the instrument housing.
Connect the RG62 type coaxial cable assembly supplied with the unit from the remote probe to the instrument
input.
Connect conduit between the switch and the supply source as required (Figure 1). Be sure the conduit is suit-
able for the environment in which the units are to be used.
Due to the extremely wide range of control and/or alarm applications in which
the unit may be used, it is not possible to show all conceivable wiring diagrams.
Consult your representative or K-TEK factory if further assistance is needed.
2.3 Caution
Be sure that all wiring and conduit conforms to the requirements of the National Electrical Code and any enforcing authorities or agencies having jurisdiction over the installation. Be sure that any special conditions, such as
hazardous area locations, are given full consideration.
After installation and wiring, it is necessary to set-up the unit to the par-
ticular vessel and material that will be measured, using the standard calibration procedure.
● The Resonator Vibrating Switch is designed to monitor levels of liquid
products with a viscosity not greater than 30,000 cps.
Figure 1
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