ARJAY ENGINEERING 2880-FCM User manual

MODELS:
2880-FCM / 2880W-FCM
2881-FCM / 2881W-FCM
2882-FCM / 2882W-FCM
PROBE MOUNTED
FOAM
LEVEL TRANSMITTER
USER MANUAL (REV:
1
.
0
)
ARJAY ENGINEERING
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]

THIS PAGE INTENTIONALLY LEFT BLANK

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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 Probe 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 ....................................................................................................... 15
6.0 STARTUP AND CALIBRATION ........................................................................... 16
6.1 Startup ............................................................................................................................. 16
6.2 Menu Flow Chart Back 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 288X Controller Setup ...................................................................................................... 17
6.3.1 Setup And Network .......................................................................................................... 17
6.3.2 Relay Setup Menu ........................................................................................................... 18
6.4 288X 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 .................................................................................................... 25
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
(2881: 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
Accuracy 0.2%
Resolution 0.05% of setpoint via network display
0.002% of Full Scale capacitance via network display
Calibration Linear 2 point Auto calibration or Manual calibration
Environmental:
Operating conditions Continuous
Ambient Temperature -20 °C to +55 °C controller
Process Temperature -60 °C to +200 °C Standard or Heavy Duty 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
Enclosure Protection Degree IP65, Die-Cast Aluminum Junction, Painted (Blue)
NEMA 4X, Die-Cast Aluminum Junction, Painted (Grey)
2880 Series Controller With
Level Probe 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
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
* 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 -d
Model: 28aaaW-bbb-c -d
Where:
aaa bbb c
d
80 LT 1 = 100-240VAC, 50/60Hz
4 = Ordinary Location Without Window, North America
81 LS 2 = N/A 5 = Ordinary Location With Window, North America
82 OWS 3 = 12 VDC 6 = Explosion Proof Without Window, North America
80W OWI 4 = 24 VDC 7 = Explosion Proof Without Window, ATEX, IECEx, North America
81W CAP 8 = Explosion Proof With Window, ATEX, IECEx, North America
82W FCM
FCS
IFA
W = Window Option
2880, 2881, 2880W & 2881W 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 2880-FCM, 2881-FCM & 2882-FCM Level Transmitter provides a proportional
analog output. The 2882-FCM includes two independent alarm relays for monitoring and control of
foam in a tank or vessel. The Model 2881-FCM provides a single isolated analog output without
relays. The designations 2880, 2881 & 2882 will be used interchangeably throughout this manual
with 288X.
The Arjay system has an active capacitance probe that is inserted into the vessel. As the foam 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 probe mounted Arjay 288X 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 288X-FCM Series Foam Level Transmitter system consists of the transmitter
enclosure integrally mounted with a capacitance probe. 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.
Calibration requires a known change of foam 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 2882-FCM 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 transmitter
 Two Differential Alarm relays (SPDT, 3A @ 250VAC) - Model 2882-FCM 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
2880-FCM PROBE MOUNTED 4-20mA (NON-ISOLATED)
2880W-FCM PROBE MOUNTED 4-20mA (NON-ISOLATED) - WINDOW MOUNT
2881-FCM PROBE MOUNTED 4-20mA (ISOLATED)
2881W-FCM PROBE MOUNTED 4-20mA (ISOLATED) - WINDOW MOUNT
2882-FCM PROBE MOUNTED 4-20mA (NON-ISOLATED) C/W RELAYS
2882W-FCM PROBE MOUNTED 4-20mA (NON-ISOLATED) C/W RELAYS - WINDOW
MOUNT
* The designation 2880, 2881 & 2882 will be interchangeable with 288X 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 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 Probe 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).
Due to static buildup during shipment the probe is left disconnected from the electronics. Make sure
probe connector is installed in to TB6 as per figure 3.
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.
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.

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4.2 Probe Installation
NOTICE Read the following information before installation.
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 sections. The fittings are sealed at the factory to provide a compression seal
capable of withstanding pressure up to 1500 psi / 10342kPa. Once opened they cannot be
reassembled without new ferrules.
The probe should be mounted vertically and parallel to a reference ground surface, which is
typically the vertical wall of the tank or a concentric shield around the probe. The following points
are important when installing the probe:
1- Reference ground: This is important for accurate measurements and is typically the metal
walls of the tank. For non-metallic tanks, a concentrically shielded probe is required 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 with more viscous material. The
distance should be greater than 25mm.
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.
NOTICE Install the probe with care. Teflon sheath is used to electrically isolate the metal probe from the liquid. Damage causing leaks may cause
reading errors.

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Figure 2 – Probe Installation

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5.0 CONTROLLER OVERVIEW
See specific drawing(s) attached to this manual for more detail
Figure 3 – CONTROLLER OVERVIEW
TB1/TB2 - Relay Output
2 SPDT relay, 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.
NOTICE The controller relays are factory set in a Failsafe mode.
TB3 - Power Input
Power input as per Model. Check if ordered AC or DC. Earth ground is connected to Primary
ground screw inside of enclosure.
TB4 - Network Output
Connect RS485 + and – to the network D+ and D-.
TB5 - mA Output
The 4-20mA is a sourced output referenced to Ground. It is not loop powered.
TB6 - Probe Input
Probe input is wired by the factory. The terminal block is disconnected during shipment for static
reasons and has to be re-connected during installation. TB6 has two “+” connections. Either is
acceptable.

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5.1 Input / Output Terminal Specification
Input Terminals – Power Source
Terminal
ID
Overvoltage
category
Rated Voltage
(V)
Rated
Current/power
(A/W/VA)
___ HZ or
DC
Specified
Mains
fluctuation
TB3 II 100-240V 150mA 50/60Hz
 10%
TB3 II 12 OR 24V 250mA DC
 15%
 10%
Input Terminals – Measuring Circuits
Terminal
ID Function Measurement Category
Nominal a.c. or
d.c line to
neutral voltage
/ if CAT I, Max.
transient
overvoltage Ut
Nominal
a.c. or d.c
current
Rating of
insulation
required for
external
circuit
TB6 Frequency I N/A -- DI * or RI**
TB4 RS485
Communication
I 5V, 5mA / 0 -- DI * or RI**
* Double Insulation
**Reinforced Insulation
Output Terminals
Terminal
ID
Function Isolation or
protection
Rated V, A Max. V, A Load type
and nominal
TB1 Load Relay 3A Contact
@250VAC -- --
TB2 Load Relay 3A Contact
@250VAC -- --
TB5 Current Isolator(optional)
- 18V,20mA,
900 
- 9V, 20mA,
450 
50mA@18V --

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5.2 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:
Power
Off
Power
On
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.
5.3 Glossary Of Symbols
Attention, consult accompanying documents
Attention, veuillez consulter les documents ci-joints.
Primary Protective Earth Ground
Primaire de terre de protection
Fuse
Coupe-circuit; fusible
Secondary Earth Ground
Mise à la terre de secondaire
Normally open relay contacts
Contacts travail
Direct Current (DC)
Courant continu
Power off
ArróÕ (mise hors tension)
Normally closed relay contacts
Contacts Repos
L
Live
Sous tension
Power on
Marche (mise sous tension)
G
Ground
Terre
N
Neutral
Neutre

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6.0 STARTUP AND CALIBRATION
6.1 Startup
WARNING
EXPLOSION HAZARD – DO NOT OPEN WHEN ENERGIZED.
WARNING
DO NOT OPEN WHEN EXPLOSIVE ATMOSPHERE IS PRESENT
Check that the power wiring and probe are wired in accordance with the electrical installation
drawing. Connect the probe terminal block TB6 as per figure 3.
Power On the unit. Allow a 1 hour warm-up period before calibrating.
The Status LED on the controller circuit board should be green. A red Status LED indicates a fault
condition. If red, check the Troubleshooting section.
The LCD will scroll to the normal operating display. See section 10.0 Menu Flow Chart.
NOTICE
An instrument setup and field calibration is required on initial power
up. See section 6.3 for controller setup and section 6.4 to calibrate the
transmitter.
6.2 Menu Flow Chart Back Chart Background Information
The control setup, diagnostics, and calibration are accessed using the display and keypad on the
controller. The Flow Chart in Section 10.0 provides an overview to the various menus and features.
Keep a copy of the flow chart at hand when accessing the internal controller features.
Below is a description of the menu functions.
6.2.1 Menu Short Form
Since the 288X controller has a small LCD, some menu description may be in short form. The
following are the menu descriptions:
Short Form Description Short Form Description
Diags: Diagnostics SENSTVTY: Sensitivity
Cal Pts: Calibration points A1: Alarm relay 1
Auto Cal: Auto calibrate A2: Alarm relay 2
Man Cal: Manual calibrate Alrm: Alarm
Cal Ok: Calibrate ok Alrm Lvl: Alarm level
Cal Err: Calibrate err HiLv1: Hi Differential alarm set value
mA out: mA output LoLv1: Lo Differential alarm set value
mA Span: mA output span Delay: Alarm Delay
Sec: Seconds ^SP: Relay Setpoint Hi action
ALRM CAL: Alarm Calibration vSP: Relay Setpoint Low action
Cal: Calibration point Dir: Relay Action (Dir = Direct)
Net ID Network Identification Fsafe: Failsafe

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6.2.2 Menu Description
The 288X-FCM controller will display the % Level value in its normal operating condition.
The 288X controller has a password protect feature. The default password is 2000. See section
6.3.1 “Password” if wish to have personal password.
From the main menu, you can select Cal Only, View, and Change.
Cal Only allows a two point calibration only. A password is required to enter this menu item and is
described in the calibration section. Output parameters and other control features cannot be
accessed through this menu. It is recommended to use this menu if only a re-calibration is to be
done.
View allows an operator to view the Calibration setpoints in pF, the Alarms settings (2882 only)
such as low or high action, failsafe or non-failsafe and the 0-600 second delay, the Diagnostics of
raw readings and the Setup values such as mA output and ID address. This can be viewed without
a password and without risk of changing any values. This information may be requested during
technical assistance inquiries.
Change is password protected and allows an operator to change the configuration set-up values
indicated in the View. Changes will be required for the initial setup of relay setpoints, delays, span
etc. or to re-set the values to the factory default.
6.2.3 Data Entry
Data Entry
Press < > / < > key to increase / decrease the digital value.
Press <SELECT> key to move the cursor.
Press <MENU> key to abort certain screens.
6.3 288X Controller Setup
Power up the 288X Controller. The status LED should be green. The LCD will scroll to the normal
operating screen after a series of the following screens (each displays for 2 sec.). * It may read %
Value at normal condition or Alarm until a calibration is performed.
Arjay
2800 S XXXXXXX PMC: INT
SW X.XXX
HW X.X NETID: X FCM X.X%
*it may read Normal or Alarm until a calibration is performed *Operating Screen
6.3.1 Setup And Network
Press and Hold the menu key to enter the main menu. Follow the Flow Chart procedure to access
the Change menu. Toggle to access the Setup menu.
The 288X Controller has the following setup parameters. These must be set up to the requirements
of the application and can be accessed in the CHANGE menu. Follow through the flowchart in
section 10.0 and input the settings as required.
1. mA Output Span
The mA output span may be set anywhere within the measurement range. Typically, the mA Span
is set at the 100% level, but this span value can be changed to any required % level.
2. mA Output

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For Direct mA output, 0% level = 4 mA, span level (e.g. 100%) = 20 mA;
For Inverse mA output, 0% level = 20 mA; span level = 4 mA.
The unit is shipped as Direct.
3. mA Type
The output can be set for 4-20mA or 0-20mA. The unit is shipped as 4-20mA.
4. Defaults
Factory settings are pre-configured into the unit based on the most typical set-up required for this
application. This provides for a quick and easy calibration at site but can be changed to suit
specific applications. If the setup has been field changed, selecting this will change back to the
factory defaults.
5. NET ID
The ID number is used only for network applications. To communicate on a network, each controller
must have a unique ID number.
NOTICE If multiple units on a network have the same address, network errors
will result.
6. Filter
Data filtering is used to smooth data from a sudden change and minimize fluctuating readings. For
example, a 5 second setting means the calculated value of the capacitance and resulting values of
pF will start to respond immediately but will take 5 seconds to reach their final values. The factory
default is 0 to provide an immediate and active response. This can be user selected from 0 - 99.9
seconds.
7. Password
The unit is shipped with password “2000”. The user can continue to use this password or may
change to a personal password after installation. To change password go to “Change” menu and
toggle down to “Setup” menu then to “Password”. Press Select. Enter new password. The password
“2000” is no longer available. Consult factory if new password has been forgotten.
6.3.2 Relay Setup Menu
Press and Hold the menu key to enter the main menu. Follow the Flow Chart procedure to access
the Change menu. Toggle to access the Alarm menu.
The 2882 Controller has 2 relays (A1 and A2) that allow 4 parameters per relay plus a time delay
value, which is common to all relays:
1. HIGH ALARM (HiLv1) POINT. This value is specified in % level. Above this value, relay action
is taken depending on the Relay Action and Failsafe settings. Factory default is 40% for A1 and
80% for A2.
2. LOW ALARM (LoLv1) POINT. This value should be less than the High control point. Below this
value, relay action is taken depending on the Relay Action and Failsafe settings. Factory
Default is 20% for A1 and 60% for A2.
3. RELAY DELAY (Delay). Minimum time in seconds for an alarm to exist before the
corresponding relay changes to its alarm state. The relay alarm state depends on the Relay
Action and Failsafe settings. Factory default is 0.
4. RELAY ACTION (Dir). High ˄sp or Low ˅sp Action. For high action, the alarm is set when the
% level rises above the high alarm set point and is reset when the % level drops below the low
alarm set point. For low action, the alarm is set when the % level drops below the low alarm

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set point and is reset when % level rises above the high alarm set point. Factory default is
HIGH action.
5. FAILSAFE (Fsafe). Failsafe typically means that the relay is normally (when not in an alarm
condition) held in an energized state. In an alarm condition, the relay is de-energized i.e.
identical to when the instrument power is shut off. The rationale is that the alarm condition
should match the Power Fail condition. Factory default is Yes.
The following table shows the effect of the Relay Action and Failsafe settings.
Relay
Action
Failsafe
Setting
Effect
High No Alarm condition when process level rises above the High Setpoint
for at least the alarm delay period.
Alarm condition remains active until the process level drops below
the Low Setpoint.
No action is taken when the process level is between the High and
Low Setpoints.
In the alarm condition, the corresponding alarm LED is turned ON,
and the relay is energized.
High Yes Alarm condition set and reset as above.
In the alarm condition, the corresponding alarm LED is turned ON,
and the relay is de-energized.
Low No Alarm condition when process level drops below the Low Setpoint
for at least the alarm delay period.
Alarm condition remains active until the process level rises above
the High Setpoint.
No action is taken when the process level is between the High and
Low Setpoints.
In the alarm condition, the corresponding alarm LED is turned ON,
and the relay is energized.
Low Yes Alarm condition set and reset as above.
In the alarm condition, the corresponding alarm LED is turned ON,
and the relay is de-energized.

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6.4 288X Controller Calibration
6.4.1 Auto Calibration
For the controller calibration the present tank foam level, in %, must be known. The % value will be
entered and the tank level must then be changed, up or down, by at least 10%. The new level, in
%, will then be entered as the second and final point.
Following the Menu Flow Chart, enter “Cal only” menu, then “Auto Cal”.
See section 6.2.3 for DATA entry setups.
1. In the 1st point entry menu, enter the current foam level value in % (e.g. 000.0%, or 50.0%).
Confirm the capacitance value in pF is stabilized, press <SELECT> key to accept the 1st
point value. The cursor will move across and accept the 1st Cal point after the last digit of
value entered. The 1st calibration point has been done. The LCD will scroll to the 2nd % point
entry menu.
2. CHANGE THE FOAM LEVEL IN THE VESSEL BY A MINIMUM OF 10.0%. The foam level
may be raised or lowered. A change of less than 10.0% may be used in some applications
but is not recommended to ensure calibration accuracy. The capacitance value in pF will
increase if raising the level or decrease if lowering the level.
3. In the 2nd point entry menu, enter the new current foam level value in % (e.g. 100.0%, or
30.0%). Confirm the capacitance value in pF (Bottom line) is stabilized, press <SELECT>
key to accept the 2nd point value. The cursor will move across and accept the 2nd Cal point
after the last digit of value entered. The 2nd calibration point has been done.
If the calibration is successful, the display will show “Cal Ok” for a couple of seconds and then
return to the calibration menu. If the display shows “Cal Err”, then a calibration fault has occurred.
Check the following:
1. The 2nd level entry value is accidentally left at the 1st calibration point % level.
- Re-do the auto calibration according to the above steps 1 – 3.
2. The level in the vessel was not changed from the 1st calibration point.
- Re-do the auto calibration according to the above steps 1 – 3.
3. If 1 or 2 are not the cause call Arjay Engineering Ltd.: Toll free: [phone] (North
America Only), tel. [phone].
6.4.2 Manual Calibration
Manual Calibration allows you to override the values that have been set through the automatic
calibration. This feature may be used for a number of different reasons. For example.
1. One of the calibration points is desired to be re-calibrated. The user can view the pF reading
of the probe in the Diagnostics menu and also record the actual level in the vessel at the
same time. These values can then be entered in the Manual Calibration to change either Cal
Point 1 or Cal Point 2.
2. If a calibration was done using 20% and 60 % as the two values (for example), but it was later
determined that the 60% should have been entered as 70%.
3. The process level cannot be altered at the time of calibration so a random pF value and %
level value is entered as the second point to allow operations until a proper second point can
be entered. See method in 1 above.
THIS COMPLETES THE SETUP & CALIBRATION PROCEDURE FOR THE
288X-FCM SERIES CAPACITANCE FOAM LEVEL TRANSMITTER