ARJAY ENGINEERING 2852-LT User manual

MODELS:
2852-LT / 2851-LT
REMOTE MOUNTED
LEVEL MONITOR
USER MANUAL (REV: 3.4)
ARJAY ENGINEERINGLTD.
2851 Brighton Road
Oakville (Toronto), Canada
L6H 6C9
TEL: ++1 [phone]
FAX: ++1 [phone]
NORTH AMERICA: 1-800-387-9487
WEBSITE: www.arjayeng.com
EMAIL: [e-mail]

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2852-LT, 2851-LT Revision 3.4 Page 3 | 28
TABLE OF CONTENT
NOTICE Please read the Installation Notes (4.0) prior to locating and mounting
the instrument.
1.0 SPECIFICATION .................................................................................................... 4
2.0 USE HAZARD INFORMATION............................................................................... 7
3.0 INSTRUMENT OVERVIEW..................................................................................... 8
3.1 Features ............................................................................................................................... 9
3.2 Model Number Table ............................................................................................................ 9
4.0 INSTALLATION.................................................................................................... 10
4.1 Remote Mounted Controller Installation ............................................................................. 10
4.2 Probe Installation ................................................................................................................ 11
5.0 CONTROLLER OVERVIEW................................................................................. 13
5.1 Input / Output Terminal Specification ................................................................................. 14
5.2 Permanent Power Connection (AC Powered Models Only) ............................................... 15
5.3 Glossary Of Symbols .......................................................................................................... 1 5
6.0 STARTUP AND CALIBRATION ........................................................................... 16
6.1 Startup ................................................................................................................................ 16
6.2 Menu Flow Chart Background Information ......................................................................... 16
6.2.1 Menu Short Form ................................................................................................................ 16
6.2.2 Menu Description ................................................................................................................ 17
6.2.3 Data Entry ........................................................................................................................... 17
6.3 285X Controller Setup ........................................................................................................ 1 7
6.3.1 Setup And Network ............................................................................................................. 17
6.3.2 Relay Setup Menu .............................................................................................................. 18
6.4 285X Controller Calibration ................................................................................................ 20
6.4.1 Auto Calibration .................................................................................................................. 20
6.4.2 Manual Calibration .............................................................................................................. 20
7.0 CONTROLLER NETWORK.................................................................................. 21
7.1 MODBUS Configuration ..................................................................................................... 21
7.2 2800 Series MODBUS Register Mapping .......................................................................... 22
8.0 MAINTENANCE.................................................................................................... 23
9.0 TROUBLESHOOTING.......................................................................................... 24
10.0 FLOW CHARTS.................................................................................................... 26
TABLE OF FIGURES
FIGURE 1 – TYPICAL INSTALLATION.............................................................................. 8
FIGURE 2 – PROBE INSTALLATION............................................................................... 12
FIGURE 3 – CONTROLLER OVERVIEW.......................................................................... 13

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1.0 SPECIFICATION
Specifications are subject to change without notice
Specification Details
Power Input:
(Specify voltage at time of
Order)
12VDC +15% /-10% or 24VDC +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 display, Alarm status LEDs and Keypad for select
menu or enter values
Communication Interface: Modbus (RS485)
Relays / Analog Outputs:
Relay Outputs 2 SPDT relays, Dry Contacts are 3A @ 250 VAC (Resistive),
selectable failsafe or non-failsafe, selectable high or low acting alarm,
programmable time delay: 0 – 600 seconds , 0-100% differential
(2851: Isolated)**
mA Signal Output 4-20 mA, 900 Ohms max (24VDC Power) OR 450 Ohms max
(12VDC Power).
** Optional (Note: If Isolation is ordered then relays are not available)
Instrument Performance:
Measuring Range 0 - 5000 pF (Most applications are 100pF to 1000pF)
Accuracy 0.2% of full scale pF
Resolution 0.004% at 1000pF
Calibration Linear 2 point Auto calibration or Manual calibration
Environmental:
Operating conditions Continuous
Ambient Temperature -20 °C to +55 °C controller
-40 °C to +55 °C PMC2800 pulse card in probe junction box
Process Temperature -60 °C to +200 °C Standard or Heavy Duty Teflon Probe
-60 °C to +100 °C Flexible Tefzel Probe
Maximum Process Pressure 1500 PSI / 10342 kPa
Relative humidity 0 to 95% (non-condensing)
Altitude ≤2000 m

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Specification Details
Installation Category II
Pollution Degree 2
Equipment mobility Fixed
Mechanical Specification: Refer to Dimensional Drawing
Protection Degree –
Controller Enclosure
Type 4 / IP65 Painted Steel (Blue)
Type 4x / IP66 Polycarbonate (Gray)
Type 4x / IP66 316 Stainless Steel
Protection Degree –
Probe Junction Box
IP65
Options on Controller
Enclosure:
Buzzer
Pilot Light OR Strobe/Beacon
Intrinsic Safety Barrier
Custom alarms
2800 Series Controller
Certification
Ordinary Locations:
• UL file number: E343390
• UL / IEC 61010-1, 2nd Edition, 2008/10/28 (Electrical Equipment
for Measurement, Control, and Laboratory Use; Part 1: General
Requirements)
• CAN/CSA-22.2 No. 61010-1, 2nd Edition, 2008/10/01, (Electrical
Equipment for Measurement, Control, and Laboratory Use; Part 1:
General Requirements)
• CE: UL / IEC 61010-1; IEC / EN 61000-4; ISO 9001:2008
Remote Level Probe
Certification
(Hazardous Locations)
North America • CSA file number: 56812
• Class – 2258-02 – Process control equipment for Hazardous
Locations
• Class – 2258-82 – Process control equipment for Hazardous
Locations – Certified to US Standards
• Ex db IIC T5 Gb
• Class I, Zone 1, AEx db IIC T5 Gb
International IECEx/ATEX *• II 2G Ex db IIC T5 Gb
• Sira 17ATEX1303X
• IECEx CSA 17.0034X
Optional Intrinsic Safety *
(Zone 0, Div 1) for North
America, IECEx/ATEX
For certifications see PMC2800/PMC2800-TMP manual
(Addendum 1) for more detail.
Note: Must order Intrinsic Safety Barrier. Model: 28aaa-bbb-c-defg
* For ATEX / IECEx / CSA / UL and EU Declaration of Conformity certificates
refer to www.arjayeng.com

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SPECIFIC CONDITIONS OF USE FOR HAZARDOUS LOCATION
(denoted by X after the certificate number)
1. Process temperature for the standard and heavy duty probes are -60°C to +200°C and for
flexible probe is -60°C to +100°C. It is end-user’s responsibility to ensure that the ambient
around the Capacitance Controller and ARJAY Probe does not exceed the permitted ambient of
+55°C.
2. The maximum process pressure is 1500psi/ 10342KPa.
3. Only approved certified entry devices shall be used.
4. Flameproof joints are not permitted to be repaired in the field. If the flamepath is damaged, the
enclosure is to be removed from service and replaced with a new enclosure.
Model: 28aaa-bbb-c-defg
Where:
aaa bbb c d e f g
51 LT 1 = 100-240VAC,
50/60Hz 0 = No Housing 0 = No Li
g
h
t
0 = No Buzzer 0 = No Intrinsic Barrier
52 LS 2 = N/A 1 = Painted Steel
blue
(
4
)
1 = Red
Pilot Li
g
ht 1 = Buzzer 1 = Intrinsic Barrier
OWS 3 = 12 VDC 2 = Polycarbonate
(
4X
)
2 = Amber
Beacon
OWI 4 = 24 VDC 3 = Brushed 316SS
(
4X
)
9 = other
CAP
FCM
FCS
IFA
ILA
2851 available for these models only.
*
*
*
*
*
*

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2.0 USE HAZARD INFORMATION
CAUTION Indicates a potentially hazardous situation that may result in minor or
moderate injury.
WARNING Indicates a potentially or imminently hazardous situation which, if not
avoided, could result in death or serious injury.
DANGER Indicates a potentially or imminently hazardous situation which, if not
avoided, will result in death or serious injury.
NOTICE Indicates a situation which, if not avoided, may cause damage to the
instrument. Information that requires special emphasis.

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3.0 INSTRUMENT OVERVIEW
The Arjay Model 2852-LT & 2851-LT Level Monitor provides a proportional analog output. The
2852-LT includes two independent alarm relays for monitoring and control of liquids or solids in a
tank or vessel. The Model 2851-LT provides a single isolated analog output without relays. The
designations 2852 & 2851 will be used interchangeably throughout this manual with 285X.
The Arjay system 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 output and relays are calibrated at user determined levels of product on the probe.
The remote mounted Arjay 285X controller monitors the capacitance change of the probe and
activates the relay contacts for use with alarms, pumps, valves, etc. The analog output and RS-485
Modbus communication are available for control interface.
The complete 285X-LT Series system consists of the probe, the PMC card and 2852 controller. The
standard probe is constructed of a Teflon coated probe. The probe length is customer specified for
the tank and depth of material to be measured. Probes can be inserted vertically or angled into the
tank. The importance is that the probe must be parallel to the tank wall when inserted for best
linearity. A concentric shielded probe is available as an option to improve linearity and achieve a
parallel ground reference. 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 be
transmitted up to one kilometer to the 2852 controller via 2-wire shielded cable.
Calibration requires a known change of level in the vessel to provide two calibration points. The
Arjay processor will automatically extrapolate to determine the 0 to 100% span.
The two relays (Model 2852-LT only) can alarm at different levels and are entered as a % value
through the keypad and display. 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.
Figure 1 – Typical Installation

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3.1 Features
• Microprocessor based RF capacitance level transmitter
• Two Differential Alarm relays (SPDT, 3A @ 250VAC) - Model 2852-LT only
• 0-20mA or 4-20mA field selectable output
• Modbus protocol via RS-485 for access by Arjay handheld, Central Access Panel or compatible
system
• Local 2 point Auto or Manual calibration or remote calibration via network
• User specified custom features may be added by contacting Arjay Engineering Ltd.
3.2 Model Number Table
MODEL DESCRIPTION
2851-LT REMOTE MOUNTED 4-20mA (ISOLATED)
2852-LT REMOTE MOUNTED 4-20mA (NON-ISOLATED) C/W 2 ALARM RELAYS
*The designation 2852 & 2851 will be interchangeable with 285X throughout this manual.

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4.0 INSTALLATION
NOTICE If any damage to the instrument is found, please notify an Arjay
Engineering representative as soon as possible prior to installation.
NOTICE Qualified Personnel must undertake all installations.
WARNING EXPLOSION HAZARD – DO NOT OPEN PROBE JUNCTION BOX
WHEN ENERGIZED.
WARNING DO NOT OPEN WHEN EXPLOSIVE ATMOSPHERE IS PRESENT
WARNING If the equipment is used in a manner not specified by the manufacturer,
the protection provided by the equipment may be impaired.
4.1 Remote Mounted 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 285X controller may be mounted up to one kilometer from the PMC card using a minimum 18
gauge, 2-wire SHIELDED cable (Belden 8760 or Equivalent).
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 (at controller side only). Incoming Earth ground should be connected to
primary ground terminal marked on sub plate.
NOTICE
The controller operates in a Failsafe Mode (factory default)
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.
NOTICE Maximum Conduit size for installation size is ¾” FNPT.
NOTICE To ensure proper operation and electrical safety, make sure the 285X
enclosure and the PMC junction box are electrically grounded.
CAUTION
The Internal ground screw provided in this enclosure must be used for
equipment grounding connection.
The External ground screw is provided for use only as a supplemental
connection where required (or, permitted) by local codes or authorities.