Kotron
®
Sentinel II
Model 804
RF Level Transmitter
Installation and Operating Manual
RF
Capacitance
Level
Measurement
Read this Manual Before Installing
This manual provides information on the Kotron Model
804 Sentinel II RF Level Transmitter. It is important that
all instructions are read carefully and followed
in sequence. Detailed instructions are included in the
Installation
section of this manual.
Conventions Used in this Manual
Certain conventions are used in this manual to convey
specific types of information. General technical material,
support data, and safety information are presented in
narrative form. The following styles are used for notes,
cautions, and warnings.
Notes
Notes contain information that augments or clarifies
an operating step. Notes do not normally contain
actions. They follow the procedural steps to which
they refer.
Cautions
Cautions alert the technician to special conditions that
could injure personnel, damage equipment, or reduce
a component’s mechanical integrity. Cautions are also
used to alert the technician to unsafe practices or the
need for special protective equipment or specific
materials. In this manual, a caution box indicates a
potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
Warnings
Warnings identify potentially dangerous situations or
serious hazards. In this manual, a warning indicates an
imminently hazardous situation which, if not avoided,
could result in serious injury or death.
Safety Messages
Follow all standard industry procedures for servicing elec-
trical equipment when working with or around high
voltage. Always shut off the power supply before touching
any components.
Low Voltage Directive
For use in Category II installations. If equipment is used
in a manner not specified by manufacturer, protection
provided by equipment may be impaired.
WARNING!
Explosion hazard. Do not connect or dis-
connect equipment unless power has been switched off or
the area is known to be non-hazardous.
Notice of Trademark, Copyright, and Limitations
Magnetrol & Magnetrol logotype, STI & STI logotype,
Kotron, and Sentinel are registered trademarks of
Magnetrol International, Incorporated. Kotron Model
804 Sentinel II RF Level Transmitter is a tradename of
Magnetrol International, Incorporated.
Copyright © 2007 Magnetrol International, Incorporated.
Performance specifications are effective with date of issue
and are subject to change without notice. Magnetrol
makes no warranty with respect to the accuracy of the
information in this manual.
Warranty
All Magnetrol/STI electronic level and flow controls
are warranted free of defects in materials or workmanship
for one full year from the date of original factory
shipment.
If returned within the warranty period; and, upon factory
inspection of the control, the cause of the claim is deter-
mined to be covered under the warranty; then,
Magnetrol/STI will repair or replace the control at no cost to
the purchaser (or owner) other than transportation.
Magnetrol/STI shall not be liable for misapplication,
labor claims, direct or consequential damage or expense
arising from the installation or use of equipment.
There are no other warranties expressed or implied,
except special written warranties covering some
Magnetrol/STI products.
Quality Assurance
The quality assurance system in place at Magnetrol/STI
guarantees the highest level of quality throughout the
company. Magnetrol/STI is committed to providing full
customer satisfaction both in quality products and
quality service.
Magnetrol’s quality assurance system
is registered to ISO 9001 affirming its
commitment to known international
quality standards providing the
strongest assurance of product/service
quality available.
Kotron Model 804 Sentinel II
RF Level Transmitter
Table of Contents
1.0 Description
1.1 Principle of Operation ..............................................1
1.2 Unpacking ................................................................1
1.3 Connecting Cable .....................................................2
2.0 Installation
2.1 Installation Location .................................................2
2.2 Mounting..................................................................3
2.2.1 Mounting Procedure ......................................3
2.2.2 Integral Mount with Standard Rigid Probe ....3
2.2.3 Integral Mount with Flexible Probe................4
2.2.4 Remote Mount with Standard Rigid Probe ....5
2.2.4.1 Remote Mount with Standard
Rigid Probe .............................................5
2.2.4.2 Preamplifier.............................................6
2.2.5 Remote Mount with Flexible Probe................7
2.2.5.1 Main amplifier ........................................7
2.2.5.2 Preamplifier.............................................7
2.3 Electrostatic Discharge (ESD) Handling Procedure...9
2.4 Wiring ......................................................................9
2.4.1 Wiring Power Supply Board ...........................9
2.4.1.1 Power wiring ...........................................9
2.4.1.2 Discrete output wiring ............................9
2.4.2 Wiring Operation .........................................10
2.4.2.1 4–20 mA output wiring ........................10
2.4.2.2 Active or passive selection .....................10
2.4.2.3 RS-485 output ......................................10
2.4.2.4 Manual self-test.....................................11
2.5 Unit Configuration .................................................11
2.5.1 General Configuration Instructions..............11
2.5.2 Password.......................................................11
2.5.3 Operator Keypad..........................................11
2.5.4 QuickCal......................................................12
2.5.5 General Programming Menus.......................13
2.5.6 Measured Value Menu..................................14
2.5.7 System Configuration Menu ........................14
2.5.8 I/O Configuration Menu .............................16
2.5.8.1 Discrete output settings.........................16
2.5.8.2 Setting 4–20 mA and
communications output ........................17
2.5.9 Advanced Configuration Menu ....................18
2.5.10 Diagnostics Menu ........................................19
3.0 Reference Information
3.1 Troubleshooting ......................................................20
3.1.1 Test Relays....................................................20
3.1.2 Test 4–20 Output.........................................20
3.1.3 Signal Values ................................................20
3.1.3.1 CCO int. cap ........................................20
3.1.3.2 Open probe...........................................20
3.1.3.3 CCO probe...........................................20
3.1.4 View Version # .............................................21
3.1.5 Factory Presets..............................................21
3.1.6 Troubleshooting Procedures .........................21
3.2 Agency Approvals....................................................22
3.2.1 Agency Specifications – Intrinsically
Safe Installation (FM/CSA).....................................23
3.3 Specifications ..........................................................24
3.3.1 Electrical ......................................................24
3.3.2 Dimensional.................................................25
3.4 Replacement Parts...................................................27
3.4.1 Replacement Parts ........................................27
3.5 Model Numbers......................................................28
3.5.1 Transmitter ...................................................28
1.0
Description
The Sentinel II is a unique, powerful level transmitter.
The leading-edge microprocessor-based circuitry has
non-volatile memory that requires no battery backup. To
simplify troubleshooting, powerful diagnostics not only
check all aspects of the system, but will actually indicate
the faulty section of the system. MagneCal™ offers the
user the greatest improvement in RF Capacitance—one
small level change (2% of span) is needed to calibrate.
1.1
Principle of Operation
The amount of capacitance developed in any vessel is
determined by the size (surface area) of the probe, the
distance from the probe to its ground reference, and the
dielectric constant of the medium being measured.
Assuming that the probe's mounting position and the
dielectric of the medium are fixed, the amount of capaci-
tance developed in any vessel becomes dependent upon
the probe's diameter and length. Adjusting the combina-
tion of the probe's diameter and length (and its proximity
to a ground reference) can generate the necessary capaci-
tance required by the electronic circuitry.
As the media rises and falls in the tank, the amount of
capacitance developed between the probe and the ground
reference also rises and falls. The capacitance-controlled
oscillator circuit mounted on the probe changes the
capacitance signal to a a digital wave form—proportional
to the change in level. The Series 804 amplifier then
converts this digital pulse signal into an isolated 4–20 mA
analog output signal.
1.2
Unpacking
Unpack the instrument carefully making sure all compo-
nents have been removed from the packing material.
Inspect all components for damage and report any con-
cealed damage to the carrier within 24 hours.
Check the contents of the carton making sure it agrees
with the packing slip and the purchase order. Verify that
the model number imprinted on the nameplate matches
the number on the packing slip and the purchase order.
Report any discrepancies to the factory. Check and record
the serial number for future reference when ordering parts.
1
50-604 Kotron Model 804 Sentinel II RF Level Transmitter
1.3
Connecting Cable
Remote mount connecting cable should be shielded,
twisted pair, 22-gauge stranded conductors and may be
ordered as Magnetrol part number 009-7146-001. Cable
length in feet must be specified at time of order; 2500 feet
(760 m) maximum; 800 feet (240 m) maximum for intrin-
sically safe models.
2.0
Installation
Caution:
Carefully read this entire section prior to installation.
2.1
Installation Location
Kotron Sentinel II Transmitters should be placed in a loca-
tion which allows easy access for service, calibration, and
monitoring. Electronics should not be exposed to ambient
temperatures below -40° F (-40° C) nor above +160° F
(+70° C). Special precaution should be taken to prevent
exposure to corrosive atmosphere, excessive vibration,
shock, or physical damage.
It is common practice to use the metal tank wall as the
ground reference. When doing this, it is required that the
probe housing make a good electrical connection to the
tank wall. If there is any doubt about this connection
(rust or using PTFE thread tape, gaskets, or paint may
impede this connection), then a separate strap should be
installed between the probe housing and the tank.
Sensing probes should be located close to the tank wall for
greatest sensitivity in non-conductive media. Isolate probes
from severe motion in the tank because surface turbulence
may cause signal deviation.
Caution:
This unit contains CMOS electronics that could be
damaged by static electricity. Do not touch any semi-
conductor devices unless you are properly grounded.
Metal-Walled Tanks
On water-based liquids, a problem should not be encoun-
tered with sensitivity or linearity. With non-conductive,
low dielectric media, sensitivity can be enhanced by locat-
ing the probe close to and parallel with the tank wall. If
this is not practical, a concentric ground tube surrounding
the probe (a stilling well) may be a solution.
50-604 Kotron Model 804 Sentinel II RF Level Transmitter
2
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