ARJAY ENGINEERING 2852-LS User manual

MODEL 2852-LS
Two Point Level Switch
User Manual
Technical Support
Continental North America Toll Free 1-[phone]
Ph: [phone] Fx: [phone]
A Product of Arjay Engineering Ltd.
Oakville, Ontario, Canada
www.ArjayEng.com
MODEL:
HARDWARE NO.: 5.1
SOFTWARE NO.:
SERIAL NO.:

Model: 2852-LS User Manual Rev: 2.1
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TABLE OF CONTENTS

1.0INSTRUMENT OVERVIEW ............................................................................................3
1.1Features .............................................................................................................3
1.2Model Number vs. Voltage Input........................................................................3
1.3Specifications .....................................................................................................4
2.0INSTALLATION...............................................................................................................6
2.1Controller Installation .........................................................................................6
2.1.1Permanent Power Connection (AC Powered Models only) ................6
2.2Probe Installation ...............................................................................................7
2.3Electrical Installation ..........................................................................................10
2.3.1Input / Output Terminal Specification ..................................................11
2.4Glossary of Symbols ..........................................................................................12
3.0STARTUP AND CALIBRATION......................................................................................13
3.1Startup................................................................................................................13
3.2Menu Flow Chart Background Information ........................................................13
3.2.1Menu Description.................................................................................13
3.2.2Menu Description.................................................................................13
3.2.3Data Entry............................................................................................14
3.32852 Controller Calibration ................................................................................14
3.3.1Site Calibration ....................................................................................14
4.0SETUP and ALARM........................................................................................................16
4.12852 Controller Setup ........................................................................................16
4.22852 Controller Alarms ......................................................................................16
4.32852 Controller Network ....................................................................................19
4.3.1Modbus Configuration .........................................................................19
4.3.22800 Series Modbus Register Mapping ..............................................20
5.0MAINTENANCE ..............................................................................................................21
6.0TROUBLESHOOTING....................................................................................................22
7.0FLOW CHARTS ..............................................................................................................23
TABLE OF FIGURES
Figure 1 – Probe Installation .........................................................................................................8
Figure 2 – Typical Application.......................................................................................................9
Figure 3 – Electrical Installation Overview ..................................................................................10
Figure 4 – No Differential Application – High Level ....................................................................17
Figure 5 – No Differential Application – Low Level .....................................................................17
Figure 6 –Differential Application – Pumping OUT .....................................................................18
Figure 7 –Differential Application – Pumping IN .........................................................................18

Model: 2852-LS User Manual Rev: 2.1
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1.0 INSTRUMENT OVERVIEW
The Arjay Model 2852-LS Two Point Level Switch Alarm provides two independent alarm relays for
monitoring and control of liquids or solids in a tank or vessel.
The Arjay probe has an active capacitance probe that is inserted into the vessel. As the material
level changes around the probe, the capacitance reading of the probe increases or decreases.
The controller relays are calibrated to alarm at user determined levels of product on the probe.
The remote mounted Arjay 2852 controller monitors the capacitance change of the probe and
activates the relay contacts for use with alarms, pumps, valves, etc.
The complete 2852-LS system consists of the probe, the PMC card, and the 2852 controller.
The standard probe is constructed of a Teflon coated probe. The PMC card is mounted in a
junction box at the top of the probe. The PMC card translates the capacitance signal from the
probe into a frequency pulse, which can then be transmitted up to one kilometer to the 2852
controller via 2-wire shielded cable.
Probes can be inserted vertically, horizontally, or angled into the tank.
On vertical and angled probes, the two relays can be set at different levels. Each relay also has a
differential setpoint to allow the relay to activate at one level and de-activate at a different level.
This is similar to a latching format which can cycle a pump or level between two points through the
use of only one relay.
On a horizontal insertion, the relays can both be calibrated to the same setpoint.
For single point high or low applications, the unit can be calibrated without having to bring to the
product level to the alarm point. For example, in a high alarm application, the controller can be
calibrated to air. An alarm will occur when the product approaches the probe.
The model is intended for use in General Purpose non-hazardous areas. For hazardous location
use refer to Arjay Engineering Ltd. For appropriate model.
1.1 Features
Microprocessor based capacitance Controller
Relay and 4/20mA alarm output
Modbus protocol via RS-485 for access by Arjay handheld, Central Access Panel or
compatible system
Local Auto calibration or remote calibration via network
User specified custom features may be added by contacting Arjay Engineering Ltd.
1.2 Model Number vs. Voltage Input
2852-LS-1 100-240 VAC power input
2852-LS-3 12 VDC power input
2852-LS-4 24 VDC power input

Model: 2852-LS User Manual Rev: 2.1
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1.3 Specifications
Power Input: 12 VDC +15% /-10% or 24 VDC +15% /-10%, 250mA maximum
100VAC – 240VAC +/- 10%, 50/60 Hz, 150mA maximum
Note: DC input models must be supplied by Limited Energy power source.
Limited Energy means compliance with one of the following requirements:
- Class 2 circuit according to Canadian Electrical Code, Part, I, C22.1;
- Class 2 circuit according to National Electrical Code, NFPA-70;
- Limited Power Supply (LPS) according to IEC 60950-1;
- Limited-energy circuit according to IEC 61010-1.
Connections to mains supply Permanent (for AC/DC model)
User Interface:
Display & Keypad Two line LCD with Alarm status display, select menu or enter
values by keypad (display is internal to housing and used for
set-up and diagnostics only)
Communication Interface: Modbus (RS485)
Analog /Relay Outputs:
mA Signal Output
4 mA during Normal and 20 mA during an alarm condition, 900
Ohms max OR 450 Ohms max (12VDC Power)
*Set for Relay 1 only
Relay Output
2 SPDT relay, dry, N.O. Contact 5A @ 250 VAC (Resistive) and
N.C. Contact 3A @ 250VAC (Resistive), selectable failsafe or
non-failsafe, selectable high or low acting alarm, programmable
time delay: 0 – 600 seconds
Instrument Performance:
Measuring Range 0 - 5000 pF (most applications are 100pF to 1000pF)
Accuracy 0.2% of setpoint
Resolution 0.05% of setpoint via network display
0.002% of Full Scale capacitance via network display
Calibration Single point per relay: Auto calibration
Environmental:
Operating conditions Continuous
Operating Temperature -20 °C to +55 °C controller
-60 °C to +55 °C PMC
-60 °C to + 260 °C probe
Relative humidity 0 to 95% (non-condensing)
Altitude ≤2000 m
Installation Category II
Pollution Degree 2

Model: 2852-LS User Manual Rev: 2.1
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Equipment mobility Fixed
Mechanical Specification: Refer to Dimensional Drawing
Enclosure Rating Type 4 / IP65 Painted Steel (Blue)
Type 4x / IP66 Polycarbonate (Gray)
Type 4x / IP66 316 Stainless Steel
Options on Enclosure Buzzer
Pilot Light OR Strobe/Beacon
Custom alarms
Approval Standards: UL / IEC 61010-1, 2nd Edition, 2005-07-22 (Electrical
Equipment for Measurement, Control, and Laboratory Use;
Part 1: General Requirements)
UL file number: E343390
CAN/CSA-22.2 No. 61010-1, 2nd Edition, 2004-07,
(Electrical Equipment for Measurement, Control, and
Laboratory Use; Part 1: General Requirements)
CE: UL / IEC 61010-1; IEC / EN 61000-4; ISO 9001:2008

Model: 2852-LS User Manual Rev: 2.1
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2.0 INSTALLATION
NOTE: If any damage to the instrument is found, please notify an Arjay Engineering
representative as soon as possible prior to installation.
2.1 Controller Installation
Choose the mounting location in accordance with good instrument practice. Extremes of ambient
temperature and vibration should be avoided (see specifications and installation drawing).
The 2850 controller may be mounted up to one kilometer from the PMC card using a minimum 18
gauge, 2-wire SHIELDED cable.
Check the polarity of the + and - wiring between the controller and the PMC prior to powering on
the unit; + to + and - to - to avoid damage. Shield of cable should be connected to secondary
ground terminal marked as . Incoming Earth ground should be connected to primary ground
terminal marked on sub plate.
Important Note: The controller is factory set in a Failsafe mode. This means that the relays
are in an energized state during normal operation. The N.O. relay contact will be held closed and
the N.C. relay contact will be held open during a normal condition. This will allow the relay to return
to its non-energized (shelf) state during an alarm, fault or power failure condition. Wire
accordingly.
Note: Maximum Conduit size for installation size is ¾” FNPT.
2.1.1 Permanent Power Connection (AC Powered Models only)
1) Connection to the building wiring system shall be in accordance with the Canadian
Electrical Code (CEC), Part 1 in Canada, the National Electrical Code, ANSI/NFPA 70 in
the USA, or the local electrical codes of the country where the equipment is being
installed.
2) A disconnecting device is required. The disconnecting means shall disconnect all
current-carrying conductors.
3) 15A circuit breaker or equivalent fuse is required.
4) An external switch or breaker shall be in close proximity to the equipment and within
easy reach of the operator. The switch shall be marked as the disconnecting device for
the equipment and include the symbols to its “ON” and “OFF” positions using the
following symbols:
5) The wiring for AC power should be minimum 18 AWG / 300V or as required by local /
country codes.
6) After field wiring, the primary wires must be secured to the enclosure by tie-wraps to
maintain the separation from the signal wires.
7) Wiring diagram for permanent connection: See drawings at the back of this manual.
8) Use copper conductors only.
Power OnPower Off

Model: 2852-LS User Manual Rev: 2.1
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2.2 Probe Installation
The probe length is custom ordered to the tank or vessel requirements. On vertical and angled
installations, the probe must be long enough to reach the lowest alarm setpoint.
The PMC junction box should be mounted above any risk of flooding.
It is recommended to use a flange, union, or retraction device for easy retraction of the probe
from the vessel. This will also assist for routine testing and calibration.
Standard probe entry into a tank is via a 3/4" NPT opening (standard probes) or 1" NPT opening
(heavy duty probes). Flanges and concentric shields are available as options. The entrance
configuration may vary depending on the application requirements.
TO SCREW IN THE PROBE (THREADED ENTRY) USE A WRENCH ON THE LOWER
FITTING ONLY. The probe fittings are compression type with Teflon ferrules assembled by
applying torque between the two hex sections. The fittings are sealed at the factory to provide a
compression seal capable of withstanding high pressures. Once opened they cannot be
reassembled without new ferrules.
The probe orientation can be vertical or angled Concentric shields can be considered for
improved linearity. Shields should only be used on clean separations where clogging from a rag
(emulsion) layer is not a concern. The following points are important when installing the probe:
1- Reference ground: This is VERY IMPORTANT for accurate measurements and is typically
the metal walls of the tank. For non-metallic tanks, a concentrically shielded probe is
recommended in which case the shield provides its own Ground. IMPORTANT: For
standard threaded entry and flange entry probes (without concentric shields), make sure the
fittings are clean to ensure a GOOD ELECTRICAL CONNECTION BETWEEN THE PROBE
HEAD ENCLOSURE AND THE TANK (REFERENCE GROUND).
2- The distance between the probe and the ground reference: This only applies to probes
without concentric shields. The closer the distance to the tank wall, the greater the
sensitivity of measurement; too close and bridging problems may occur.
3- The degree of parallelism between the probe and the reference ground: The probe
must be parallel to the reference ground for a linear output signal. Note: the concentric
shield option is inherently linear due to the concentric shield.
4- The measurement accuracy may be affected by the temperature change of the
material in the tank. The amount of measurement error depends on the material. If the
temperature change is excessive, temperature correction may be required. Contact the
Arjay representative for more information.
5- Agitators or moving objects in the tank: Moving objects in the tank close to the probe
such as agitator blades, moving baffles etc. appear as moving ground references to a
capacitance probe and will cause measurement errors. In applications where these objects
are present, a concentrically shielded probe should be used.
CAUTION: INSTALL THE PROBE WITH CARE: THE TEFLON SHEATH IS USED TO
ELECTRICALLY ISOLATE THE METAL PROBE FROM THE LIQUID. DAMAGE CAUSING LEAKS MAY
CAUSE READING ERRORS.

Model: 2852-LS User Manual Rev: 2.1
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Figure 1 – Probe Installation
NOTE:
To ensure proper operation and electrical safety, make sure the 2852 enclosure and
the PMC junction box are electrically grounded.
If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
Use wrench on Lower Hex ONLY
1- For threaded and flanged entry types, the probe must be parallel to the tank wall
2- For threaded and flanged entry types, measurement sensitivity is increased by
reducing the probe to wall distance.
3- There should be good electrical conductivity between the tank wall and the
transmitter enclosure. (For probes with a concentric shield this is not important).
THREADED ENTRY FLANGED ENTRY
INSTALL PROBE WITH CARE: IF TEFLON COATING IS DAMAGED,
THE PROBE WILL NOT WORK
CONCENTRIC SHIELD ENTRY
2" Entry
Typical

Model: 2852-LS User Manual Rev: 2.1
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Figure 2 – Typical Application

Model: 2852-LS User Manual Rev: 2.1
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2.3 Electrical Installation
Figure 3 – Electrical Installation Overview
TB1/TB2 - Relay Output
2 SPDT relay, Dry, N.O. Contact 5A @ 250 VAC (Resistive) and N.C. Contact 3A @
250VAC (Resistive), selectable failsafe or non-failsafe, selectable high or low acting alarm,
programmable time delay: 0 – 600 seconds
TB3 - Power Input
Power input as per Model. Check if ordered AC or DC. . Earth ground is connected to G.
TB4 - Network Output
Connect RS485 + and – to the network D+ and D-.
TB5 - 4/20 mA Output (+ and -)
The 4/20 mA is a sourced output referenced to Ground. It is not loop powered.
4mA = Normal 20mA = Alarm
TB6 - Probe Input
Connect ‘+’ to ‘+’ , ‘-‘ to ‘-‘ between the controller and the PMC card. Check polarity to avoid
damage.
TB7 – Buzzer / Red Pilot Light Output (Optional)
The connection will be factory wired if ordered.