Honeywell HA20 User manual

HA20 2-Channel Controller
Technical Manual
A1
A2
A3/Fault
Channel 1
A1
A2
A3/Fault
Magnetic
Keypad
(Keypad buttons
behind door)
HA20 Display & Alarm Controller
Two Channel
Edit Alarm
Reset
Next
219995
Classified to CSA C22.2 NO. 152 for combustibles
detection. Class I, DIV.2, Groups A,B,C,D
READ & UNDERSTAND MANUAL!
S/N 90-
or 10-30 VDC @ 3 WATTS
Power = 100-240 V~, 50/60 Hz, .45 A
Channel 2
Cal

HA20 2-Channel Controller
HA20 Technical Manual i
Safety
WARNING
Read and understand contents of this manual prior to operation.
Failure to do so could result in serious injury or death.
IMPORTANT SAFETY
The following terms and symbols are used in this manual to alert the
operator of important instrument operating issues:
This symbol is intended to alert the user to the presence
of important operating and maintenance (servicing)
instructions.
This symbol is intended to alert the user to the presence of
dangerous voltage within the instrument enclosure that may be
of sufficient magnitude to constitute a risk of electric shock.
This symbol signifies the system’s ground terminal
DC refers to direct current voltages.
VAC refers to alternating voltages.
WARNINGS
• Shock Hazard - Disconnect or turn off power before servicing
this instrument.
• NEMA 4X wall mount models should be tted with a locking
mechanism after installation to prevent access to high voltages
by unauthorized personnel (see Figure 4-1).
• Only the combustible monitor portions of this instrument have been
assessed by CSA for 122.2 No. 152 performance requirements (for
combustibles using mA input.
• This equipment is suitable for use in Class I, Division 2, Groups
A,B,C and D or non-hazardous locations only.
• EXPLOSION HAZARD- SUBSTITUTION OF COMPONENTS MAY
IMPAIR SUITABILITY FOR CLASS I, DIVISION 2.
• EXPLOSION HAZARD- DO NOT REPLACE FUSE UNLESS POWER
HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-
HAZARDOUS.
• EXPLOSION HAZARD- DO NOT DISCONNECT EQUIPMENT UNLESS
POWER HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN TO
BE NON-HAZARDOUS.
CAUTIONS
• Use a properly rated CERTIFIED AC power (mains) cable
installed as per local or national codes.
• For DC powered units, DC power must be from a SELV rated
source.
• A certied AC power (mains) disconnect or circuit breaker
should be mounted near the controller and installed according
applicable local and national codes. If a switch is used instead
of a circuit breaker, a properly rated CERTIFIED fuse or current
limiter is required to be installed as per local or national
codes. Markings for positions of the switch or breaker should
state (I) for on and (O) for off.
• Clean using only a damp cloth with no solvents.
• Equipment not used as prescribed within this manual may
impair overall safety

HA20 2-Channel Controller
HA20 Technical Manual ii
Table of Contents
Safety ����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������i
1 General Description
1 General Description ����������������������������������������������������������������������������������������������������������������������������������������������������������1-2
1�1 Data Display Screens ����������������������������������������������������������������������������������������������������������������������������������������������1-3
1.1.1 Main Data Screen .............................................................................................................................................1-3
1.1.2 Trend Screen .....................................................................................................................................................1-3
1.1.3 Blind Mode Screen ............................................................................................................................................1-3
1�3 Specifications ����������������������������������������������������������������������������������������������������������������������������������������������������������1-3
1.3.1 Power Supply Requirements .............................................................................................................................1-3
Warning ..............................................................................................................................................................1-4
1.3.2 Relays ...............................................................................................................................................................1-4
1.3.3 Ambient Temperature Range ...........................................................................................................................1-4
1.3.4 Humidity Range ................................................................................................................................................1-4
1.3.5 Altitude ..............................................................................................................................................................1-4
1.3.6 Housings / Installation Categories ....................................................................................................................1-5
1.3.7 Approvals ..........................................................................................................................................................1-5
2 Operation
2 Operation ���������������������������������������������������������������������������������������������������������������������������������������������������������������������������2-2
2�1 Setup Menu Configuration ��������������������������������������������������������������������������������������������������������������������������������������2-2
2�2 Changing Menu Variables Using The Keypad ��������������������������������������������������������������������������������������������������������2-3
2.2.1 Setup Configuration Menus ..............................................................................................................................2-3
2.2.2 Channel Setup Entry Menu ...............................................................................................................................2-3
2.2.3 Alarm 1 / Alarm 2 / Alarm 3 Set-Up Menus .......................................................................................................2-3
2.2.4 Using the Configure Menu to Define Channel ..................................................................................................2-4
Name / Eunits ASCII Data Fields .........................................................................................................................2-4

HA20 2-Channel Controller
HA20 Technical Manual iii
Input Measurement Range...................................................................................................................................2-5
Decimal Point Resolution .....................................................................................................................................2-5
Turning Off Unused Channels ..............................................................................................................................2-5
2.2.5 CAL Setup Menu .........................................................................................................................................2-5
2.2.6 Calibrate Input Menu .........................................................................................................................................2-6
2�3 System Configuration Menus ���������������������������������������������������������������������������������������������������������������������������������2-7
2.3.1 Relay 1 / Relay 2 Menus ...................................................................................................................................2-7
2.3.2 Horn / Piezo Menu ............................................................................................................................................2-8
2.3.3 Comm Port Menu ..............................................................................................................................................2-8
2.3.4 Clock / Delays Menu .........................................................................................................................................2-9
2.3.5 Diagnostics Menu .............................................................................................................................................2-9
2�4 System Security Menu�������������������������������������������������������������������������������������������������������������������������������������������2-10
3 Motherboard Interface PCB
3 Motherboard Interface PCB ���������������������������������������������������������������������������������������������������������������������������������������������3-2
3�1 Input / Output Optional PCB’s ��������������������������������������������������������������������������������������������������������������������������������3-3
3.1.1 Optional Analog Input PCB ...............................................................................................................................3-3
3.1.2 Optional Discrete Relay PCB’s..........................................................................................................................3-4
3.1.3 Optional 4-20mA Analog Output Board ............................................................................................................3-5
3�2 Modbus RS-232 / RS-485 Interface Option ������������������������������������������������������������������������������������������������������������3-6
3.2.1 Modbus Register And Function Code Summary ...............................................................................................3-7
4 Enclosures
4 Enclosures ������������������������������������������������������������������������������������������������������������������������������������������������������������������������4-2
4�1 HA20PCS/HA20SS NEMA Steel Enclosures ����������������������������������������������������������������������������������������������������������4-2
4�2 HA20PY NEMA Polycarbonate Enclosure �������������������������������������������������������������������������������������������������������������4-2
4�3 HA20XP NEMA 7 Explosion-Proof Wall Mount Enclosure������������������������������������������������������������������������������������4-3
5 Parts List
5 Parts List ���������������������������������������������������������������������������������������������������������������������������������������������������������������������������5-2
6 Specifications

HA20 2-Channel Controller
HA20 Technical Manual iv
5 Specifications �������������������������������������������������������������������������������������������������������������������������������������������������������������������6-2
7 Warranty
Honeywell Analytics Warranty Statement ��������������������������������������������������������������������������������������������������������������������������7-2

HA20 2-Channel Controller
HA20 Technical Manual v

HA20 2-Channel Controller
HA20 Technical Manual 1-1
1 General Description

HA20 2-Channel Controller
HA20 Technical Manual 1-2
1 General Description
The Honeywell Analytics HA20 2-Channel Controller is designed to
display, and control alarm event switching for two inputs. Inputs are
typically voltage or 4-20mA current from transmitters, monitors or
other analog output devices. The HA20 is equipped with a Fault and
three alarm levels per channel with features such as ON / OFF delays,
latching relays and alarm Acknowledge. A dedicated horn driver circuit
for a local audible annunciator is also standard. Two standard 5-amp
alarm relays are configurable via the “alarm voting” menu to make
relays trip based on various alarm combinations. A real-Time Clock
and Calendar are also standard. Options such as 4-20mA outputs,
discrete relays for each alarm and audible annunciators are easily
added. RS-485 (Modbus RTU) ports are also available for sending
data to PC’s, PLC’s, DCS’s, or other Honeywell Analytics controllers.
A 128 x 64 pixel graphic LCD readout displays monitored data as bar
graphs, 30-minute trends and engineering units. System configuration
is via user friendly menus and all configuration data is retained in non-
volatile memory during power interruptions. The HA20 front panel
shown in Figure 1-1 displays the bar graph data screen. The five
button symbols below the display are magnetically activated using the
magnetic wand (supplied) without opening the enclosure. Opening
the enclosure door provides access to the “touch” keypad as shown
in Figure 1-2.
A1
A2
A3/Fault
Channel 1
A1
A2
A3/Fault
Magnetic
Keypad
(Keypad buttons
behind door)
HA20 Display & Alarm Controller
Two Channel
Edit Alarm
Reset
Next
219995
Classified to CSA C22.2 NO. 152 for combustibles
detection. Class I, DIV.2, Groups A,B,C,D
READ & UNDERSTAND MANUAL!
S/N 90-
or 10-30 VDC @ 3 WATTS
Power = 100-240 V~, 50/60 Hz, .45 A
Channel 2
Cal
Figure 1-1. Front Panel
SW1-SW5 are the magnetic keypad allowing operator
interface w/o opening the enclosure. Touch key access requires
opening the enclosure.
Ch1 Alarm LEDs
LCD readout contrast
adjustment
UP DOWN NEXT EDIT RESET
Ch2 Alar
m LEDs
Piezo
Figure 1-2. Front Panel Display (open enclosure)

HA20 2-Channel Controller
HA20 Technical Manual 1-3
1.1 Data Display Screens
The HA20 Controller offers three modes for displaying monitored data,
as shown in Figure 1-3.
Figure 1-3. Data Display Screens
1.1.1 Main Data Screen
The HA20 Main Data screen shown in Figure 1-3 allows each channel
to be viewed simultaneously. Engineering unit values and bar graph
values are both displayed in real time. Arrows below the bars indicate
alarm trip point values, making it easy to identify channels at or
near alarm level. The direction the horizontal 45º side arrow points
indicates either a HIGH or LOW trip point. In Figure 1-1 where Ch 1
points right indicating high trip levels and Ch 2 points left indicating
low trip levels. Left and Right hand arrows located at the ends of
each bar graph point towards Channel Alarm LED’s on the front panel
associated with this reading. The 10-digit ASCII fields for identifying
engineering units and Channel ID for each channel are also shown
on the Main Data screen.
1.1.2 Trend Screen
In addition to the Main Data screen described above, the HA20 also
provides 30-minute trend screens for each channel as shown in Figure
1-3. Use the Next key to scroll between data screens.
1.1.3 Blind Mode Screen
The HA20 Blind Mode screen (Figure 1-3) does not allow viewing of
channel engineering unit values. It only indicates the system’s alarm
status and time / date. Some applications require only alarm status be
displayed and prefer monitored values not be shown. A SECURITY
menu (see Section 2.4) allows locking all configuration parameters
and having only the Blind Mode screen available for viewing.
1.3 Specications
1.3.1 Power Supply Requirements
The HA20 is equipped with an integral 15 watt (or 50 watt, depending
on the configuration) universal AC input / 24 VDC output switching
power supply. Standard HA20 AC power requirements are 100-240
VAC 50/60 Hz @ .45 amp max (including inrush) and 20 watts steady
state, applied to TB5 on the motherboard. If AC power is not available,
the HA20 may also be powered with 24 VDC applied to TB1 on the
motherboard. A primary DC source or back-up DC source capability
should be determined by the total system power budget calculation
with guard-band included. A back-up DC power source may also be
connected to TB1 for automatic switchover if the AC power source
fails. See Figures 3-1 & 3-2 for wiring information.
WARNING
A back-up or external DC power source DOES NOT source aux power
output (TB3 - see Figure 3.1)

HA20 2-Channel Controller
HA20 Technical Manual 1-4
The basic HA20 consumes only 1.5 watts of 10-30 VDC from the
integral power supply.
Optional features, and external devices such as remote transmitters,
increase power consumption as described below:
• Discrete Relay PCB option; add 1.5 watt.
• 4-20mA Output PCB option; add .5 watt.
• TB3 terminals 1 & 2 on the motherboard provide a maximum
of 350mA output power for powering of auxiliary external
devices such as relays, lamps or transmitters (see Figure 3-1).
Power consumed from these terminals must be included when
calculating system power consumption.
• 10-0221-2, Analog Input PCB option; add wattage for each
monitor connected to this board’s 24 VDC terminal
Some applications require the HA20 controller to source power for high
power monitors. Both 15 watt and 50 watt power supplies, UL rated
for Div 2 hazardous areas, are available. This option is also available
with a Div 1 enclosure if an explosion-proof enclosure is required. (See
Section 5 - Specifications.)
WARNING
A backup, or external DC power source DOES NOT source auxiliary
power output (see gure 3.1 TB3).
1.3.2 Relays
Two mechanical (dry contact) Common Form C relays are standard and
may be mapped to various alarm events as described in Section 2.3.1.
HA20’s may also be equipped with optional solid-state common Form
A relays (see Section 5 - Specifications for details) in applications
requiring non-arcing switching. Solid-state relays are recommended
for switching of highly inductive loads.
A six mechanical (dry contact) Discrete Relay option board (see
Section 3.1.6
) provides dedicated Form C relays for ALARM 1, ALARM
2 and FAULT for all channels.
WARNING
All mechanical (dry contact) relays are rated at 5 Amp for 28 VDC
and 250 ~VAC RESISTIVE loads. IMPORTANT: Appropriate diode (DC
loads) or MOV (AC loads) snubber devices must be installed with
inductive loads to prevent RFI noise spikes.
Optional solid state relays are rated at 2 Amp 12-280~VAC (600Vpk).
Relay wiring should be kept separate from low level signal wiring.
1.3.3 Ambient Temperature Range
-25 to 50 degrees C
1.3.4 Humidity Range
0 to 90% R. H. Non-Condensing.
1.3.5 Altitude
Recommended up to 2000 meters

HA20 2-Channel Controller
HA20 Technical Manual 1-5
1.3.6 Housings / Installation Categories
• *NEMA 4X wall mount. DIV 2 Groups A,B,C,D; Category II and
pollution degree 3; NEMA 4X; IP66
• *NEMA 4 painted carbon steel
• SS316 NEMA4X
• Polycarbonate NEMA4X
• *NEMA 7 wall mount for DIV 1 & 2 Groups B,C,D; includes
O-ring in door to satisfy NEMA 4 rating.
*Includes standard non-intrusive magnetic keypad.
1.3.7 Approvals
• CSA C22.2 No 1010.1 and ISA S82.02
• CSA C22.2 No 152 for combustibles (mA input only)
• UL 1604 / C22.2 No 213 (Div 2 Groups A,B,C,D)
• EN55011 & EN61000 (CE Mark). CSA File # = 219995 and
may be seen at: www.CSA-International.org.

HA20 2-Channel Controller
HA20 Technical Manual 2-1
2 Operation

HA20 2-Channel Controller
HA20 Technical Manual 2-2
2 Operation
The HA20’s graphic LCD displays monitored data. The 5-button
keypad and the display serve as the system’s operator interface.
All configuration variables are entered using this operator interface
through SETUP menus accessed by pressing Edit from either data
screen. This Setup mode may be exited manually by pressing Next,
or automatically when no keys are pressed for 5 minutes. Alarm relays
and front panel alarm LED indicators remain active during the Setup
mode. Alarm LED’s flash upon new alarms and become steady after
Acknowledged by pressing the Alarm Reset key. A SECURITY menu
offers a password feature to prevent tampering with HA20 parameters.
A “sign-on” screen appears briefly after power is applied that indicates
what type of input / output options are configured with the unit.
Several signal conditioning input options are available to allow the
HA20 to accept sensor and other analog signals directly (see Section
3.1).
2.1 Setup Menu Conguration
Variables within the CHANNEL (see Section 2.2) and SYSTEM (see
Section 2.3) menu trees allow HA20 configuration of a wide range of
monitoring applications. Select the desired menu by scrolling with Up/
down arrows and then Edit to enter each menu. Figure 2-1 illustrates
the menu tree configuration with Channel variables on the left and
System variables on the right. Channel variables affect only the specific
channel selected while System variables are related to features not
specific to either channel.
HA20 Dual Channel Controller Menu Tree
Figure 2-1. Menu Tree

HA20 2-Channel Controller
HA20 Technical Manual 2-3
2.2 Changing Menu Variables Using The
Keypad
Figure 2-1. Keypad
Upon entering a menu, a pointer controlled by the up/down arrow keys,
indicates the selected variable. Some are simple YES/NO or ON/OFF
entries toggled by pressing the Edit key. Others, such as Channel ID
and Eunits fields, may have many ASCII character possibilities. Allowed
ASCII characters are as follows:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
blank space
!”#$%&`()*+,-./0123456789:;<=>?@[\]^_`.
Notice the often used blank character is located after lower case z
and before the exclamation point !. Edit places a cursor under the item
and up/down arrow scroll through each allowed entry. The Next key
moves the cursor to the next position within a field. When the field is
complete, Edit clears the cursor and loads the field into non-volatile
memory where it is retained indefinitely. Without a cursor present, the
Next key closes open menus in reverse order and returns the LCD to
the data display.
2.2.1 Setup Conguration Menus
The SETUP menu shown in the middle of Figure 2-1 and in Figure
2-2 is reached by pressing Edit with any data display present. This is
the entry-level screen to all Channel, System and Security menus. It
also shows the firmware version operating in the HA20. Use the up/
down arrows keys to move the pointer to the desired menu and press
the Edit key to select.
Figure 2-2. Setup Conguration Menu
2.2.2 Channel Setup Entry Menu
The Channel x SETUP menu shown in Figure 2-3 allows configuration
of all variables for the selected channel. These are Alarm 1, Alarm 2,
Alarm 3, Configure and CAL Setup.
Figure 2-3. Channel Setup Entry Menu
2.2.3 Alarm 1 / Alarm 2 / Alarm 3 Set-Up Menus
Alarm 1, 2 and 3 have identical menus. The only difference is that
A1 LED indicators are yellow while A2’s and A3’s are red. Typical
applications often have A1 set at a WARN level, A2 at a HIGH level and
A3 at a negative FAULT level. However, it is important to understand
there is no functional difference between A1, A2 and A3, therefore
only one is shown in Figure 2.4.
Magnetic
Keypad
(Keypad buttons
behind door)
Edit Alarm
Reset
Next
Cal

HA20 2-Channel Controller
HA20 Technical Manual 2-4
Figure 2-4. Alarm Setup Menu
• Set Point is entered in engineering units and determines
the value at which the alarm trips. For example, if a channel
monitors 0-50 ppm H2S and the desired alarm level is 10 ppm,
the correct entry is 10.00. A one percent deadband prevents
alarm chatter. This means after tripping an alarm the input must
move at least 1% of full scale back through the setpoint for the
alarm to auto reset.
• The ON Delay / OFF Delay entries allow ON and OFF time
delays affecting how long the trip-point must be surpassed
before an alarm event transition occurs. ON delays are limited
to 10 seconds while OFF delays may be as long as 120
minutes. Delays are useful in many applications to prevent
nuisance alarms and unwanted cycling into and out of alarm
conditions.
• Low Trip is set to NO to increase alarms or YES to decrease
alarms, which determines if the alarm activates upon exceeding
or falling below the set-point.
• Latching determines either manual or automatic alarm reset
operation. YES requires a manual Alarm Reset to unlatch the
alarm even though an alarm condition no longer exists. YES
also causes this alarm’s common relay, front panel LED, and
optional discrete relay to latch. NO allows all outputs for this
alarm to automatically reset after the alarm condition clears.
Discrete LED indicators on the front panel indicate the status of each
alarm. Any new alarm event causes the associated LED to flash until
an Alarm Reset occurs causing an acknowledged steady on condition.
Operators should recognize new alarms by a flashing LED. Alarm
Reset also acknowledges, or deactivates, audible devices driven by
the AUDIBLE ALARM option connector J2 (see Figure 3.2)
2.2.4 Using the Congure Menu to Dene Channel
The next menu option, after the Alarm Setup option, is Congure.
It allows setting Name and EUNIT fields, defining the measurement
range (Zero and Span), how many decimal points of resolution the
reading will have and whether the channel is active (Figure 2.5).
Figure 2-5. Congure Menu - Dene Channel
Name / Eunits ASCII Data Fields
The first two items in this menu, Name and EUNIT, are for entering
the 10 character channel Name and engineering unit ASCII fields.
Name should describe the channel’s data in user terminology such as
tag # or other description. Eunits should define the units of measure
for what this channel is to display. Several standard Eunits fields are
available by pressing Edit but if these are inappropriate, a CUSTOM
field allows editing of each character. Section 2.2 describes how to
modify these fields using the keypad.

HA20 2-Channel Controller
HA20 Technical Manual 2-5
Input Measurement Range
The ZERO / SPAN menu options allow configuration of the
measurement range displayed by this channel. Measurement Range
defines the range of the input signal’s engineering units. For example,
if a channel’s input is 4-20mA from a transmitter monitoring 0 to 10ppm
chlorine, then the Zero value should equal 0.000 and the Span value
equal 10.00. Four digits must be entered so trailing 0’s may appear
here that are not displayed on other data screens.
Decimal Point Resolution
Resolution of the displayed channel value is configured in the Decimal
Pts. menu by setting the number of digits trailing the decimal point.
Displayed readings are limited to a maximum of four digits with a
polarity sign. Auto-ranging displays the highest resolution allowed by
this menu’s decimal point entry. For example, a range of 0 to 100ppm
and two decimal points reads 0.00 at 0ppm and 100.0 at 100ppm.
This may be undesirable due to the high resolution at zero unless
the sensor’s output is extremely stable. If decimal points are limited
to one, the 0ppm reading becomes 0.0 and the 100ppm reading
remains 100.0.
Resolution may be limited further by setting decimal points to 0 where
in the above example, 0ppm reads 0 and 100ppm reads 100.
Turning Off Unused Channels
The Channel Active menu entry asks if this channel is to be utilized.
OFF causes the controller to never process inputs applied to this
channel and no alarms are tripped or data displayed. Inactive channels
have a line drawn through them on the Setup screen to indicate they
are turned off.
2.2.5 CAL Setup Menu
The CAL SETUP feature supports pushbutton calibration of zero
and span values. This feature should only be utilized when there are
no other zero/span controls within the monitoring system since it is
inappropriate to calibrate a signal at more than one point.
Therefore, if calibration will be performed at another transmitter or
monitoring device, the CAL MODE feature should not be used.
The CAL SETUP menu allows entering the correct Zero Gas & Span
Gas set-point values needed to calibrate the sensor. These are entered
in the same engineering units as the input range.
Figure 2-6. Cal Setup Menu

HA20 2-Channel Controller
HA20 Technical Manual 2-6
2.2.6 Calibrate Input Menu
Calibration is the most important function for ensuring correct operation
of HA20s equipped with sensor inputs. The CAL MODE (flow chart
shown in Figure 2-7) is designed to make calibration quick, easy and
error free. A successful ZERO and SPAN calibration requires only five
keystrokes. Optional 4-20mA outputs (if equipped) transmit 1.5mA
during CAL MODE and 4mA during the subsequent CAL PURGE
delay to prevent external alarms during calibration. Local HA20 alarm
relays are inhibited during CAL MODE. Unintentional calibrations
may be reset using the Set UNITY menu item. Set UNITY resets
CAL OFFSET to 0 & CAL GAIN to 1 which is useful for returning the
calibration to a known starting place. Sensor aging may be monitored
by recording zero and span readings at Unity Gain when the sensor
is new, and again later when degradation may have occurred. CAL
MODE automatically exits if no keystroke is detected after 5 minutes.
Follow these sensor calibration guidelines:
• Calibration accuracy is only as good as the calibration standard
accuracy. Honeywell Analytics recommends calibration
standards with NIST (National Institute of Standards and
Technology) traceable accuracy to increase the validity of the
calibration.
• Do not use a gas cylinder beyond its expiration date.
• Calibrate a new sensor before use.
• Allow the sensor to stabilize before starting calibration. (Consult
the appropriate sensor manual for warm-up times.)
• Calibrate on a regular schedule. (Consult the appropriate sensor
manual for calibration intervals or depending on use and sensor
exposure to poisons and contaminants.)
• Calibrate only in a clean atmosphere free of background gas.
Use the following step-by-step procedure to perform ZERO and SPAN
calibrations.
1. To enter the CAL MODE from any data display, press the dual
purpose down arrow/CAL key and press the Edit key within 5
seconds then select channel.
2. Using the Cal-Cup and following the instructions on the screen,
apply a clean ZERO gas or be sure there is no background
target gas in the monitored area. After the reading is stable,
(approximately 1 minute) press the Edit key to perform a ZERO
calibration.
3. If the ZERO calibration is successful, CAL MODE automatically
proceeds to the SPAN check.
4. Apply the correct SPAN calibration standard. After the reading
is stable, press the Edit key to perform a SPAN calibration.
WARNING
The SPAN gas used must match the value specied since this is what
the HA20 will indicate after a successful SPAN calibration. The Span
Gas value may be edited if it becomes necessary to apply a different
gas concentration (see Figure 2.6 [Span Gas] in Section 2.2.5).
5. If the SPAN calibration is successful, the display flashes
“REMOVE CAL GAS” and starts the CAL PURGE delay.
6. CAL MODE will be complete after the end of the CAL PURGE
delay.

HA20 2-Channel Controller
HA20 Technical Manual 2-7
The flow chart in Figure 2-7 illustrates the above procedure. up arrow,
CAL, Next & Edit labels indicate keystrokes (down arrow/CAL is a dual
purpose key). The CAL MODE information screen (top of the chart) is
available for advanced users to see Offset / Gain calibration constants
and live analog to digital converter (A/D) counts. Span Gas calibration
values may also be edited from this screen. Holding the up arrow key
for 5 seconds during CAL MODE displays this screen.
Unity Gain may be used at anytime to cancel incorrect calibrations
and start again.
Figure 2-7. Cal Mode Flow Chart
2.3 System Conguration Menus
Several items needing configuration are not specific to either channel
but affect the entire system. These are located in the system tree
entry menu shown on the left side of Figure 2-1. System menus
are accessed by pointing to the desired item and pressing Edit. The
Diagnostics menu group (\) is useful for testing relay and analog I/O
without stimulating the input.
Figure 2-8. System Conguration Menu
2.3.1 Relay 1 / Relay 2 Menus
The Relay 1 & Relay 2 menus are identical except Relay 2 has an
acknowledge feature that is useful if it controls an audible device.
All other Relay 1 & Relay 2 features are identical and therefore are
discussed only once.
Figure 2-9. Relay Menus
• The Set Relay Logic menu shown below in Figure 2-10 offers
additional “voting” flexibility by controlling the channel alarm
combinations that will trip this common alarm relay. “OVR” on
the menu’s right side stands for override and means ANY of the
selected alarms will activate the relay. The “OR” / “AND” columns
work together based upon the following logic equation:

HA20 2-Channel Controller
HA20 Technical Manual 2-8
[AND column selections] ANDED WITH [OR column selections] = relay
activation.
For example, if Ch1A1 & Ch2A1 are selected in the AND column and
Ch1A2 & Ch2A2 are selected in the OR column, the logic equation
is [Ch1A1 AND Ch2A1] ANDED WITH [Ch1A2 OR Ch2A2]. This
requires both A1s along with either A2 to activate the relay.
Figure 2-10. Set Relay Logic
• Failsafe controls relay activation for the common relays. Failsafe
ON causes these relays to de-energize during alarm conditions
and energize when there is no alarm.
With Failsafe active, a power failure forces the relay contact to
the alarm position.
• Horn controls how activating this relay will affect the horn driver
circuit connected to J2 on the motherboard. Choices are NO,
STEADY or PULSE (Ex.: The horn can be set to Pulse for
warning. alarm levels and set to Steady for high alarm levels. Thus,
personnel can know which alarm level is present by based on the
pulsing or steady horn).
• Turning Acknowledge ON (not allowed on Relay 1) allows
Relay 2 to be deactivated by an Alarm Reset during alarm
conditions. This is useful if another audible device is being driven
by the relay. The acknowledge feature is not available for Relay
1 since it is often used for driving a warning light and Relay 2
for driving a horn. Using Acknowledge (thus deactivating) when
horn and light are activated could be dangerous since this
deactivates both and no indication of the High alarm remains.
2.3.2 Horn / Piezo Menu
• The HA20 display PCB is equipped with a small audible piezo
(NEMA 4X housing only) that chirps when keys are pressed
providing an audible feedback to the operator. It also may be
set to audibly indicate alarm conditions by selecting YES in the
Piezo On menu option (Figure 2-11). This piezo will then mimic
the Horn settings menus described in Section 2.3.1.
• The Horn ACK menu item determines if the Horn Driver output
may be acknowledged by an Alarm Reset. YES causes an
Alarm Reset to silence the horn even though an alarm condition
remains active.
Figure 2-11. Horn/Piezo Menu
2.3.3 Comm Port Menu
The system Comm Port menu allows setting RTU address for the
optional slave Modbus serial port. This slave port may be used to
transfer HA20 data to a host device such as a PC, PLC, DCS or even
another Honeywell Analytics Controllers. The slave port is addressable,
allowing many HA20 controllers to be connected to a single RS-485
cable.
Figure 2-12. Communication Port Menu

HA20 2-Channel Controller
HA20 Technical Manual 2-9
2.3.4 Clock / Delays Menu
• The HA20 monitors signals from sensors that may require
varying times to stabilize after power is applied. The Startup
Delay menu item allows setting how long alarm relays remain
disabled after power is applied.
• Cal Delay determines how long alarm relays are inhibited after
completing a calibration.
• The HA20 is equipped with a 24-hour clock and calendar. Time
and Date menu items are for setting the correct time and date.
Time of day must be entered in 24 hour mode. For example,
6:00:00 PM = is indicated as18:00:00.
Figure 2-13. Clock/Delay Menu
2.3.5 Diagnostics Menu
WARNING
Alarm processing is halted with the Diagnostics mode active.
The Diagnostics menu (Figure 2-14) is useful for testing standard and
optional Input / Output devices such as relays and 4-20mA outputs.
Diagnostic menu items are described below:
Output Zero / Output Span DAC value (digital to analog converter)
menu items are set at the factory to calibrate optional 10-0223 4-20mA
Output boards. If field adjustment is required, monitor the 4-20mA
output and set the Output Zero DAC value for 4mA on each channel
then set the Output Span DAC value for 20mA on each channel. These
menu items may also be used to drive 4-20mA into receiver devices
without stimulating sensor inputs.
Input Min / Max ADC (analog to digital converter) menu items are
set at the factory with default values for each channel of 200 to 1000
counts. These settings may be utilized to affect what input values
provide ZERO and SPAN readouts. For example, if an application
required 8mA input to read ZERO at 400 counts, an Input Min setting
of 400 would accomplish this.
Common Relays menu item allows manual activation of the common
relays and optional local audible piezo.
Discrete Relays menu item allows manual activation of the optional
10-0222 Discrete Relay boards.
Figure 2-14. Diagnostics Menu