ASTi IOTRON Troubleshooting guide

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
Installation Guide & User Manual
Three Channel Touchscreen Controller for
Smart Digital RS-485 MODBUS RTU
HiQDT pH, ORP & D.O. Sensors
Three (3) channel controller with 7.0” Touchscreen on left with bottom input ports & top output ports on right. Three HiQ4FP panel
connectors are NEMA 6P input ports for HiQDT sensors. Integral ½”NPT cable glands number seven (7) on bottom input side &
nine (9) on output side for NEMA 4X wiring of power, analog & digital outputs, contact relays and remote access via ethernet port.
INSTALLATION & USER GUIDE VERSION 4.00 - Last Revised August 16, 2019
Welcome to the installation guide and user manual for the three (3) channel touchscreen controol for use with the smart
digital RS-485 MODBUS RTU HiQDT pH, ORP & D.O. sensors. This controller package offers a ready made plug and
play solution to perform pH, ORP & dissolved oxygen measurements in the field enabling all functionality and features of
the smart digital HiQDT MODBUS sensor platform. This controller package is custom coded software allowing for
seamless integration on proven industrial HMI & PLC equipment from Maple Systems with Class I, Division II approvals
for all hardware. This manual covers all aspects that are particular to this specific software implementation. For general
documentation aspects please refer back to the Maple Systems documentation provided on the following page.
Default main display window for three channel configuration.
Access to all other screens is obtained through the main menu.
Status updates, alarms & alerts are scrolled across top of screen.
The main menu that highlights the major various tasks and
functionality of the controller. Addition submenus will load as
appropriate to further navigate the available features & options.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
THREE CHANNEL ADVANCED TOUCHSCREEN CONTROLLER HARDWARE:
• Serpac I352HL,TCBG NEMA 4X Enclosure with Clear Hinged Latched Door ready for wall or pipe mounting
• Serpac 7200HP Plastic Swivel Top Plate with Cutout for HMI5070 advanced touchscreen with pull handle
• Serpac 7200B Aluminum Bottom Plate for mounting of 35mm DIN-RAIL assemblies
• 7 each input side and 9 each output side ½” NPT cable glands factory installed into NEMA 4X enclosure assembly
Maple Systems Model HMI5070L 7.0” Advanced Touchscreen HMI (Max 350mA @ 24VDC)
https://www.maplesystems.com/Product/Index/57c14ec4-27f6-4256-9e0f-497034c99115
Maple Systems Model MLC1-E0808Y0402T PLC (Max 500mA @ 24VDC)
https://www.maplesystems.com/Product/Index/d2a566bb-a1d6-450e-9b23-d15d9f59b5a6
Maple Systems Model MLE-A0004 - I/O Expansion Module | 4 Analog Outputs (Max 80mA @ 24VDC)
https://www.maplesystems.com/Product/Index/837001e8-6da1-41ed-95b8-c230733c37e6
• 2 each CUI PQDE6W-Q24-S12-DIN 9-36 VDC to 12 VDC Converter for HiQDT sensors (1500V Galvanic Isolation)
• 1 each SerialComm CON-485/422-REP Isolator for RS-485 HiQDT MODBUS RTU Dissolved Oxygen sensor input(s)
• 6 each isolated analog outputs (scalable and selectable as 4-20mA or 0-10VDC)
• 6 each isolated contact relays Max 2A at 230VAC or 30VDC (Hi & Lo Setpoint for Process Value from each Channel)
• 3 each HiQDT discrete sensor inputs (Prewired to PLC via 35mm DIN-RAIL mount terminal board)
• MODBUS MODBUS TCP Slave (a.k.a. MODBUS over Ethernet)
ASSEMBLY SIZE: 11.8 inches (300mm) Width X 11.0 inches (280mm) Height X 7.5 Inches (190mm) Depth
NET WEIGHT: 8.8 Pounds (4.0 kilograms)
SHIPPING BOX: 14 inches X 12 inches X 9 inches
SHIP WEIGHT: 9.8 pounds (4.5 kilograms)
POWER CONFIGURATIONS:
HiQDT-CTRL-3CH-7MF-PS0 Isolated 24VDC ±15% - Default Base Power Configuration
HiQDT-CTRL-3CH-7MF-PS1 85 to 264 VAC Power Operation with:
o Phoenix Contact UNO-PS/1AC/24DC/30W or Mean Well 4010-0010 24VDC power supplies
§ Phoenix Contact Max 1.25A @ 24VDC and Mean Well Max 1.7A @ 24VDC
HiQDT-CTRL-3CH-7MF-PS1C1D2 85 to 264 VAC Class 1, Div. 2 Operation with RHINO PSB24-060S-P
o Max 2.5A Nominal Output @ 24VDC
HiQDT-CTRL-3CH-7MF-PS2 Non-Isolated 18 to 75 VDC with RHINO DC/DC PSP24-DC24-1
o Max 1.0A Nominal Output @ 24VDC
HiQDT-CTRL-3CH-7MF-PS3 Non-Isolated 9.5 to 18 VDC with RHINO DC/DC PSP24-DC12-1
o Max 1.0A Nominal Output @ 24VDC
SOFTWARE:
Advanced menu-driven color touchscreen interface for all features and functionality as detailed in this manual.
INDIVIDUAL COMPONENT MAX POWER CONSUMPTION:
HMI: 350mA @ 24VDC
PLC: 500mA @ 24VDC
Module: 80mA @ 24VDC for MLE-A0004
HiQDT Sensors: 3 each dual or 6 each single: 120mA @ 12VDC
MAX TOTAL POWER: 990mA @ 24VDC – SUPPORTED AMBIENT OPERATING TEMPERATURES ARE 0 to 50
°
C
NOTE: Inquire to factory about the most suitable power configuration for your installation. Although it is possible to change the
power configuration after dispatch from factory this is not best practice since as all powered connections are pre-wired at factory before
shipment. All power related wiring would need to be modified if the power configuration is changed at a later time.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
THREE CHANNEL ADVANCED TOUCHSCREEN CONTROLLER PHOTOS (1)
Output side angle view shown with lid & swivel plate open.
Touchscreen HMI & PLC interfaced by removable power block
& serial cable allowing for simple, convenient and cost effective
replacement if HMI is damaged. The D+ (white) & D- (green)
leads doe signals from sensors connected to COM3 while
ethernet cable is for MODBUS TCP & remote access.
Top close-up detail wiring view with lid & swivel plate off. All
internal connections are pre-wired from factory as shown above
with only power connection required to start commissioning.
The logged data is stored on the 32GB USB flash drive that can
then be readily removed & downloaded to a Windows PC for
further analysis & workup. Please see the datalogging sections
of this manual for additional details and instructions.
The isometric angle bottom input view is shown in the photo to
the left with the lid closed to protect the HMI and maintain the
NEMA 4X rating of the assembly.
The sealing caps on the NEMA 6P rated HiQ4FP panel mount
connectors for the smart digital HiQDT MODBUS RTU sensor
inputs should be affixed if not in use. Similarly all of the factory
installed ½” NPT cable glands should have the provided sealing
cap affixed when not in use to maintain NEMA 4X waterproof
rating for assembly.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
THREE CHANNEL ADVANCED TOUCHSCREEN CONTROLLER PHOTOS (2)
HiQDT-CTRL-3CH three (3) channel controller with 7.0”
touchscreen HMI is shown with lid & swivel plate open. The
HMI & PLC are interfaced with only the power terminal block
and communication cable cable allowing for simple and
convenient replacement if damaged. Clear hinged latched door
provides NEMA 4X protection for advanced touchscreen HMI
from environment. To access internal components of controller
simply remove two top screws & open with pull handle.
The rear mounting plates on back of the controller as supplied
make it ready for immediate wall or pipe mounting in the field
without the purchase of any additional specialized hardware.
Standard commercial U-Bolt can be used for achieve a pipe
mounting scheme & commercial bolts and washers can be sued
to achieve mounting to a wall or plate.Inquire for any planned
installation schemes that are not covered by the brackets shown
above which are suitable for most all of the typical wall or pipe
mounting schemes.
On bottom input side are factory installed 7 each ½” NPT cable
glands and 3 each NEMA 6P rated female snap panel mount
connectors for plug & play hot-swappable HiQDT smart digital
sensors. Sealing cap for panel connectors should be secured and
provided caps for cable glands affixed when not in use to
maintain NEMA 4X rating.
Top output side with latches have 9 each each ½” NPT cable
glands factory installed giving a total of 16 each cable glands for
the three channel controller (including 16 each sealing caps to
cover all cable glands to ensure NEMA 4X rating of assembly
when no cables are installed). When ethernet cable is used
install the alternate cable gland provided (not shown above).
The 3 channel controller with 7.0” touchscreen is suitable for use in hazarduous Class I, Division II rated locations when
using a power supply option with the same rating. An example is the ASTI factory supplied AC line-powered model
HiQDT-CTRL-3CH-7MF-PS1C1D2 configuration. Inquire to factory for assistance with questions about suitability for any
particular configuration for a planned instalaltion location before purchasing equipment.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
INITIAL COMMISSIONING STEPS:
1. Provide power to touchscreen controller. Depending upon configuration this can be Isolated 24VDC ±15% (PS0), 85-
265 VAC (PS1 or PS1C1D2), Non-Isolated 18 to 75 VDC (PS2) or Non-Isolated 9.5 to 18 VDC (PS3) power type
a. If unsure about correct location & power type to be provided to unit consult factory to avoid damage!!
2. Determine desired configuration of sensor types to be used for each of the available six channels. It is not necessary
to setup all sensor channels at time of commissioning. Channels may be added or removed over the course of time if
desired. Note any such changes for any upstream connected PLC, DCS or SCADA.
3. Setup sensor with correct node & baudrate for channel w/ Windows software or handheld communicator (HHC)
4. Configure each sensor type from touchschreen controller for the channel to be used.
5. Plug in HiQDT sensors terminated with HiQ4M male snap connector (or extension cable termianting in the same)
into one of the available HiQ4FP female panel mount connector. It makes no difference which sensor type or channel
is plugged into which port with the HiQDT sensor multi-drop RS-485 MODBUS RTU communications.
6. If commissioning was successful each channel that was display proper sensor type & live values in main screen.
7. Wire up analog outputs and contact relays to be used after configuring them from the appropriate screens.
8. Setup secure remote access with EZAccess 2.0 software. One-time registration is required to Maple Systems.
9. Setup email notifications for trigger events to prompt when remote login might be advisable when not at site.
The handheld communicator (HHC) can both search for the node
of the connected sensor as well as to modify the node if desired.
Using this battery powered handheld communicator (HHC) to
control the node assignments of the MODBUS RTU sensors
allows for a very convenient field installation scheme for the
commissioning of the advanced touchscreen controllers.
For ongoing maintenance the HHC can modify the sensor node
to the desired value for the channel to which it is to be hot-swap
exchanged in a plug and play manner for ease of field workflow.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
INSTALLATION GUIDE
The software in the three (3) channel touchscreen controller is specifically designed to be used with IOTRON™ &
ZEUS™ series smart digital RS-485 MODBUS RTU HiQDT pH, ORP & D.O. sensors. All functionality detailed in this
manual can also be performed by the ASTI supplied handheld battery powered communicator (excluding only changing
of the baudrate and node address which is only possible using the Windows software). The Windows software can
perform ALL possible operations on the smart digital RS-485 MODBUS RTU HiQDT pH, ORP & D.O. sensors. The ASTI
supplied HiQDT HMI+PLC touchscreen controller package that is a turn-key unit available for purchase ready for plug
and play commissioning with a robust software suite (see this manuals for details on all capabilities and usage details).
Alternatively any PLC of your choice can be programmed to accomplish the same features if you prefer. If implementing
on your own PLC instead of using the ASTI supplied package the software layout can serve as a roadmap for your own
installation if you wish. All functions performed by this software can also be accomplished on your own customer
supplied PLC with the appropriate modbus function calls (see separate implementation guide for details) with the
exception of setting the baudrate and node address (Windows software must be used to perform these tasks). Please see
the separate installation guide for the HiQDT pH, ORP & D.O. sensors for use with customer supplied PLC if you plan to
choose this route for commissioning of your system where you will supply all of the software on the PLC to be used.
The software contains the following menus and fields, all of which are accessible starting with the main menu.
MENUS
(Left Column in the Main Menu):
Page(s)
MENUS
(Right Column in the Main Menu):
Page(s)
“Select Channel” menu
• Set the working channel (global setting)
• Note about baudrate & node address
8
8
“Hold Channel Output” menu
• Set channel on hold for maintenance
26
“Sensor Type” menu
• Sensor Type
• Node Address Scheme for HiQDT Sensors
9
9
“Analog Output Status” menus
• Configure Analog Output
• Scale Analog Outputs
• Wiring for Analog Outputs
27
28
29
“Calibrate Sensor” menu
• Display Current Calibrations
• Autobuffer Calibration (pH Only)
o Auto pH Buffer A.P. Cal (Offset)
o Auto pH Buffer Acid Slope Cal
o Auto pH Buffer Base Slope Cal
• Manual Calibration
o Manual ORP Offset Cal
o Manual pH A.P. (Offset) Cal
o Manual Temperature Offset Cal
o Manual Calibrate pH Acid Slope
o Manual Calibrate pH Alkaline Slope
• Dissolved Oxygen (D.O.) Calibrations
• Adjust Dampener Settings
• Reset All Calibrations
10
10
11
11
12
12
12
13
14
15
15-16
17
18-19
20
20
“Set Output & Relays” menus
• Enter low & high setpoints for PROCESS
setpoints & view status of process relays
• Enter low & high setpoints for TEMP
setpoints & view status of temp relays
• Wiring for Relay Outputs
“MODBUS TCP Slave Regsiters” menus
• HiQDT Sensors PROCESS VALUES
• HiQDT Sensors CALIBRATION INFO
• HiQDT Sensors ANALYTIC INFO
30
30
31
32
33
34
“Controller Info & Sensor Diagnostics” menu
• Snapshot of the current sensor analytic info
21
“Relay Event Status” menu
• Shows record of relay On/Off events
35
“Email Notifications” menus
• Email Notifications Setup
• Email Notifications Menu
22
23
“Remote Access 2.0” menu
• Initial Setup of remote access feature
• Remote client login to controller
36
37
“Controller Info” and “Trend Display” menu
• Display information about current controller
• Hard Reset back to factory defaults
• View trending graphs for each channel
24
24
25
Miscellaneous
Download, view logged data (local/remote)
Sample Process, Calibration & Analytic Data
Appendix “A, B, C, D, E & F”
Software License Agreement (EULA)
38-40
41-43
44-49
50-51

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
Default Home Screen & Main Menu
Default home screen shows live process & temperature
values for all connected HiQDT sensors & raw absolute
mV values for all channels in controller configuration. If
the commissioning steps as detailed in page 5 of this
manual were successful completed then sensors added
will be shown in this home screen along together with
corresponding node address in use for each channel.
If for any reason any of the channels that was setup does
not display correctly it is possible to use the “ASTI
Windows Datalogging & Graphing Windows Software for
3TX Transmitters with MODBUS Output” to troubleshoot
the HiQDT MODBUS sensor configuration. In this case
you would temporarily disconnect the D+ & D- input
leads to the HMI and temporarily redirect the output to
this Windows software (contact factory for assistance).
Please refer to the separate manual for this software for
instructions on how to configure it for use with the
HiQDT sensors for such a purpose.
Main Menu is accessible from the home default display
screen as shown on top to the right. Exiting from the
main menu will load back the default display screen.
After a period of inactvivity you will also get returned
back to the home default display screen.
Subsequent portions of manual detail specific sub-menus
or screens that are accessible starting from this main
menu. If unsure where as specific menu is located please
refer to the table of contents on the previous page six (6).
The clickable items in any of the screens is indicated by
being shown in blue and/or shown as a button.
Wiring of HiQDT Sensor D+ & D- Inputs to HMI5070 on DE9S COM3 (RS-485 2-wire)
The white lead from HiQDT sensor input(s) is connected to terminal 8 (D+)
The green lead from HiQDT sensor input(s) is connected to terminal 7 (D-)
Communication between HMI5070 on COM1 DE9P RS-232 port to MLC1-E0808Y0402T on
COM1 RJ45 RS232 port is accomplished with factory installed custom cable assembly.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Select Channel” Menu
The select channel is a global setting. Most all tasks
to be performed in the remainder of the menu such
as sensor type & node address, sensor calibration,
setup and scaling of analog output and relays use
the channel that is set in this menu.
You must first desginate whether you are adding or
removing a channel from service. After selecting the
channel you can set the sensor type for that channel
by clicking on the “Select Sensor Type” to navigate
directly to this screen.
The working channel can be changed by clicking on
the number shown in blue which will load a screen
where a new channel can be entered. Valid choices
are one to three (1 to 3). You will be asked to
confirm each channel addition or removal.
If adding a new sensor after designating the channel
to which it will be assigned you will then
automatically proceed to “Sensor Type” screen for
configuration. The channel number must be
designated before the valid node address for the
particular sensor type can be appropriately assigned.
IMPORTANT NOTE ABOUT BAUDRATE:
The default baudrate for all HiQDT sensors to be used with the six channel controller is 19,200 kbps. Default baudrate for
the HiQDT sensors is 19,200 unless otherwise requested at time of purchase. If the baudrate is changed to 9,600 kbps on
your HiQDT sensor it cannot be used with the ASTI HiQDT touchscreen controller. ONLY the ASTI HiQDT Windows
software can change the baudrate of the HiQDT smart digital RS-485 MODBUS RTU sensors (see manual for details).
IMPORTANT NOTE ABOUT NODE ADDRESS:
The default node address for HiQDT sensors assumes channel 1. The default node address will be exactly the same as the
sensor type. So for pH the sensor type is 1 and the default node address is 1. Likewise for the standard range ORP the
sensor type is 2 and so the default node address is 2. Similarly for the wide range ORP the sensor type is 3 and the default
node address is 3. Lastly for dissolved oxygen (D.O.) the sensor type is 4 and so the default node address is then also 4.
IMPORTANT NOTE: ONLY the ASTI HiQDT Windows software or the ASTI handheld communicator (HHC) can
change the node address of HiQDT smart digital RS-485 MODBUS RTU sensors (see respective manuals for details).
ORDERING NOTES:
HiQDT sensors can be ordered with node addresses pre-assigned other than the default values shown above. This is
done by adding “-NX” to the end of the part number where X is the node address to be factory assigned. If not special
indication is made then the sensor will come with the standard default node address scheme as detailed above. For cases
where the sensors are purchased together with the controller a logical preset node scheme will be provided so that all
sensors will automatically show up in the home display screen allowing for plug and play operation right out of the box.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Sensor Type” Menu
The table at the bottom of this page details the node
address that should be assigned for each sensor type
depending upon the channel to which it is to be
commissioned (installed). This information is also
shown in the “Sensor Type” screen as can be seen to
the right. Clicking on the sensor type will assign the
node address as appropriate for the current working
channel that has been previously selected.
Note that the sensor type can ONLY be configured
for the currently selected channel.
The sensor type for the current channel can be
changed by clicking on one of the the available
HiQDT sensor types (pH, Standard ORP, Wide
Range ORP or Dissolved Oxygen D.O.). For each
sensor type the correct node addresses are shown for
channel 1/2/3 where the numbers are the proper
node address for the given channel. While this node
address will be set for the selected channel please be
sure to confirm that the sensor you plan to use for
this channel has already been configured for the
correct node before making the change in the
controller configuration.
Current working node changes to selection after
update sensor button is pushed and confirmed.
Node Address Scheme when using with ASTI Touchscreen HiQDT PLC Controller
When HiQDT sensor is used with ASTI Touchscreen HiQDT PLC Controller then node address MUST be set as defined in
the table below. If HiQDT sensor & controller are ordered together the node addresses would be preset at factory.
Channel #
1
2
3
Node Range
1-40
41-80
81-120
pH sensor
1
41
81
Standard ORP sensor
2
42
82
Wide Range ORP Sensor
3
43
83
Dissolved Oxygen Sensor
4
44
84
Reserved for future
HiQDT sensor types
5-40
45-80
85-120
COMMISSIONING AND SETUP:
ONLY the ASTI HiQDT Windows software or ASTI Handheld Communicator (HHC) can change the node address of
the HiQDT smart digital RS-485 MODBUS RTU sensors (see respective manuals for details).
SENSOR COMMUNICATIONS:
If a channel that has been configured loses communications this event will be scrolled across the top of the home
screen and written to the system log. If email notifications have been setup an email will also be sent in such an
event. Placing a sensor on output hold will not halt the sensor communications warning if it is removed from service.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
SUMMARY OF CORRECT SEQUENCE FOR CALIBRATION OF HiQDT pH SENSOR WITH BUFFERS
1. Perform temperature calibration (manual mode only)
2. Select the three pH buffers to be used to perform the calibration (See Appendix A, B & C)
3. Perform pH ‘Offset’ Calibration (Autoread or Manual) a.k.a. Asymmetric Potential abbreviated as A.P.
4. Perform pH ‘Acid Slope’ Calibration (Autoread or Manual)
5. Perform pH ‘Alkaline Slope’ Calibration (Autoread or Manual) a.k.a. Base Slope
6. If desired, perform adjustment for agreement with laboratory reference value of process grab sample
with pH ‘Offset’ mode. Account for all temperature induced effects if this last step is performed.
“Calibrate Sensor Menu”
All sensor calibrations can be shown from the
“Display Current Calibrations” selection. The
“Autobuffer Calibration” is only valid for pH
sensors. The “Manual pH/ORP & Auto DO
Calibration” mode is valid for all sensors. “Adjust
Sensor Dampener” and “Reset All Calibrations”
tools are also valid for all sensor types. The “D.O.
Sensor Setup” allows changing salinity and air
pressure values used to compute percent saturation.
For faster calibration operation you can temporarily
adjust the sensor dampener to a shorter time than
when it is in field use for continuous measurements.
“Display Sensor Calibrations”
The calibration values for the sensor in the current
working channel can be shown in this screen.
Simply click on the Current Working Channel
shown in blue and choice the channel that you wish
to view if the desired selection is now what is
shown. Finally to view the current calibrations then
click “Get Calibrations” button and the values for
the selected channel will be shown.
The calibrations will be loaded as appropriate for the
given sensor type that is assigned to that channel. In
the case shown to the right a calibration was very
peformed fairly recently and so the time since
calibration is shown as 3.17 days. If this display
sensor calibrations screen is shown immediately
after calibration then the time since calibration
should show as 0.0 days instead.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Auto Calibrate pH Only” Menu
The autocalibration is only available if the sensor type
is pH for the channel to be calibrated. You need only to
select the channel for which you wish to perform
autobuffer calibration on a pH sensor to begin the
process.
You will always start by performing the asymmetric
potential (offset) calibration for the pH sensor followed
by the acid slope calibration and finally the alkaline
slope calibration.
It is recommended to place the channel to be calibrated
on output hold before proceeding with the calibration.
“Auto pH Buffer A.P. Cal”
The current pH and temperature are shown for selected
channel in this screen along with the existing currently
used asymmetric potential offset calibration as well as
the time since this calibration was last performed.
Choices of pH buffer for auto A.P. calibration are 7.00
or 6.86. After selecting buffer click on “Calibrate”
button. If calibration is successful then “Calibration
Complete” is shown. After dampener time expires the
new calibration result will be shown and the time since
calibration will show as 0.00 days. The exact value of
pH buffer at cal temp shown as “Calibrated Value”.

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Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Auto pH Acid Slope Calibration”
The current pH reading and temperature are shown for
the selected channel in this screen along with the
existing currently used acid slope calibration as well as
the time since this calibration was last performed.
Choices of pH buffer for auto acid slope cal are 4.00 or
1.68. After selecting buffer click on “Calibrate” button.
If calibration is successful then “Calibration Complete”
is shown. After dampener time expires the new
calibration result will be shown and the time since
calibration will show as 0.00 days. The exact value of
pH buffer at cal temp shown as “Calibrated Value”.
“Auto pH Base Slope Calibration” Menu
The current pH reading and temperature are shown for
the selected channel in this screen along with the
existing currently used alkaline slope calibration as well
as the time since this calibration was last performed.
Choices of pH buffer for auto base slope cal are 10.00 or
9.18 or 12.45. After selecting buffer click on “Calibrate”
button. If calibration is successful then “Calibration
Complete” is shown. After dampener time expires the
new calibration result will be shown and the time since
calibration will show as 0.00 days. The exact value of
pH buffer at cal temp shown as “Calibrated Value”.
“Manual Calibrate” Menu
The available choices for manual calibration of a pH
sensor are shown to the right.
The slope calibration is only available when the sensor
type is pH. In addition the pH offset calibration must
always be performed before the slope calibrations can be
performed.

13
Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Manual Calibrate ORP Offset”
The manual calibration menu options are shown to the
right. The ORP offset can be performed with a ORP
standard or else used to allow for agreement between
the inline process reading and an offline grab sample
determination.
The current ORP reading and temperature are shown for
the selected channel in this screen along with the
existing current used offset calibration as well as the
time since this calibration was last performed.
Enter the value to which you wish to adjust the reading
of the ORP sensor. In the case that a ORP standard is
used the exact value at the current temperature should
be entered. Note that ORP measurements are not
temperature compensated but are in fact highly
temperature dependent. When calibrating this must be
taken into take.
After pressing the “Calibrate” button the screen will
display “Calibrating”. If the calibration is successful it
will show “Calibrationg Complete”. The calibration
might not be successful if the calibration limits are
exceeded or else is a communication error occurs.
Finally after the dampener time is expired the new
calibration results will be shown and the time since
calibration will show as 0.00 days. The basic sequence of
events after pressing the calibrate button also occurs for
the temperature offset calibration as well.

14
Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Manual Calibrate pH Offset”
The manual calibration pH offset can be performed with
a pH buffer or else used to allow for agreement between
the inline process reading and an offline grab sample
determination. Such adjustments to a grab sample
value should always be done in the ‘Offset’ mode after
all pH buffer calibrations are performed.
The current pH reading and temperature are shown for
the selected channel in this screen along with the
existing current used asymmetric potential offset
calibration as well as the time since this calibration was
last performed.
Enter the value to which you wish to adjust the reading
of the pH sensor. In the case that a pH buffer is used the
exact value at the current temperature should be entered
(see appenix “A” and “B” for further details).
After pressing the “Calibrate” button the screen will
display “Calibrating”. If the calibration is successful it
will show “Calibrationg Complete”. The calibration
might not be successful if the calibration limits are
exceeded or else is a communication error occurs.
Finally after the dampener time is expired the new
calibration results will be shown and the time since
calibration will show as 0.00 days. The basic sequence of
events after pressing the calibrate button also occurs for
the autobuffer calibrations screens as well as the manual
calibration screens.
It is important to recall that the acid slope and base slope
calibrations for pH sensors should always be done after
performing the offset calibration first. For any type of
calibrations to force agreement between the inline
process reading and an offline determined value this
should ALWAYS be done in the manual offset
calibration mode and never in the manual slope
calibration mode. Contact factory for assistance if the
best practice calibration procedures are in doubt.

15
Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Manual Calibrate Temp Offset”
The current pH reading and temperature are shown for
the selected channel in this screen along with the
existing current used temperature offset calibration as
well as the time since this calibration was last
performed.
Enter the temperature value to which you wish to adjust
the reading of the pH sensor. It is always best practice
to calibrate the temperature BEFORE performing any
process calibrations.
After pressing the “Calibrate” button the screen will
display “Calibrating”. If the calibration is successful it
will show “Calibrationg Complete”. The calibration
might not be successful if the calibration limits are
exceeded or else is a communication error occurs.
Finally after the dampener time is expired the new
temperature calibration results will be shown and the
time since calibration will show as 0.00 days. In the
screenshot shown to the right the temperature
calibration is shown being perform on a dissolved
oxygen (D.O.) type sensor. The temperature calibration
screen for the ORP sensor types will look largely similar
to the pH offset screen in the screenshot above.
“Manual Calibrate pH Slope” Menu
Before proceeding to the manual pH slope calibration it
is necessary to have previously performed the pH
Asymmetric Potential (A.P.) offset calibration first.

16
Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Manual Calibrate pH Slope” Menu - ACID
Select the desired channel where you wish to perform
the slope calibration.
The current pH reading and temperature are shown for
the selected channel in this screen along with the
existing current used asymmetric potential offset
calibration as well as the time since this calibration was
last performed.
Enter the value to which you wish to adjust the reading
of the pH sensor to perform the acid slope calibration.
In the case that a pH buffer is used the exact value at the
current temperature should be entered (see appenix “A”
and “B” for further details).
After pressing the “Calibrate” button the screen will
display “Calibrating”. If the calibration is successful it
will show “Calibrationg Complete”. The calibration
might not be successful if the calibration limits are
exceeded or else is a communication error occurs.
Finally after the dampener time is expired the new
calibration results will be shown and the time since
calibration will show as 0.00 days. The basic sequence of
events after pressing the calibrate button also occurs for
the autobuffer calibrations screens as well as the manual
calibration screens.

17
Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Manual Calibrate pH Slope” Menu - BASE
The current pH reading and temperature are shown for
the selected channel in this screen along with the
existing current used asymmetric potential offset
calibration as well as the time since this calibration was
last performed.
Enter the value to which you wish to adjust the reading
of the pH sensor to perform the acid slope calibration.
In the case that a pH buffer is used the exact value at the
current temperature should be entered (see appenix “A”
and “B” for further details).
After pressing the “Calibrate” button the screen will
display “Calibrating”. If the calibration is successful it
will show “Calibrationg Complete”. The calibration
might not be successful if the calibration limits are
exceeded or else is a communication error occurs.
Finally after the dampener time is expired the new
calibration results will be shown and the time since
calibration will show as 0.00 days. The basic sequence of
events after pressing the calibrate button also occurs for
the autobuffer calibrations screens as well as the manual
calibration screens.
It is best practice to view the result of your calibrations
to ensure that everything is shown as expected. An
example is shown to the right for bringing up the sensor
calibration display screen for the channel which was just
calibrated in the screenshots showing the various
manual offset and slope modes.

18
Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Auto Calibrate D.O. Sensor” Menu - Temperature
You need to select the channel for which you wish to
perform the fully automated dissolved oxygen sensor
calibration. If you are not sure prefer to the main
screen as it will display on what channel D.O. sensor(s)
have been configured.
The usual caveats apply before performing calibration
on you dissolved oxygen (D.O.) sensor. The channel
that will be calibrated should be placed on hold prior to
performing the calibration especially if the values
obtained from the sensor are used for any type of real-
time closed loop control purposes.
The D.O. sensor should be at thermal equilibrium
before proceeding and be clean and dry, suspended
over a source of water in cases of low humidity at the
location where the sensor is to be calibrated.
The TEMPERATURE should always be CALIBRATED
FIRST on the dissolved oxygen sensor. The reason is
that the temperature is used as the main basis of
obtaining the dissolved oxygen ppm value for the
current dry in air condition used as the basis of the
automated calibration routine. If the temperature is not
stable before proceeding and not well calibrated you
can obtain suboptimal results when calibrating the D.O.
sensor in the field.
Finally after the dampener time is expired the new
temperature calibration results will be shown and the
time since calibration will show as 0.00 days. Following
the instructions on the following page to proceed onto
the calibration of the dissolved oxygen ppm reading for
the process value next.

19
Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Auto Calibrate D.O. Sensor” Menu – Dissolved Oxygen PPM readings
The current dissolved oxygen ppm readings, computed
percent saturation values and temperature readings are
shown for selected channel in this screen along with the
existing currently slope calibration value as well as the
time since this calibration was last performed.
The smart digital HiQDT MODBSU RTU dissolved
oxygen sensors automatically compute the current
dissolved oxygen ppm value for the current dry in air
conditions using the temperature and ambient air
pressure as the basis.
Click on the “Calibrate” button to start the fully
automated calibration procedure. If calibration is
successful then “Calibration Complete” is shown. After
dampener time expires the new calibration result will
be shown and the time since calibration will show as
0.00 days. The exact value of pH buffer at cal temp
shown as “Calibrated Value”.
NOTE 1: The percent saturation value shown on this
calibration screen (register 30006 from the HiQDT D.O.
sensor) may differ from the percent saturation value that is
shown on the main display. The percent (%) saturation
value that is computed and shown in the calibration screen
excludes the salinity correction since this is not appropriate
during the dry in air calibration process of the sensor. The
percent (%) saturation that is computed and displayed in the
main screen (as well as the basis for all analog & digital
outputs and relays) including the salinity correction. The
ambinet air pressure that is user entered is always used when
computing the precent (%) saturation value in all modes.
NOTE 2: Review “Appendix E & F” for details about
how percent (%) saturation is computed from measured
dissolved oxygen ppm and temperature values as well
as the user entered air pressure and salinity.
It is best practice to view the result of your calibrations
to ensure that everything is shown as expected. An
example is shown to the right for bringing up the
sensor calibration display screen for the channel which
was just calibrated in the screenshots showing the
calibration of the dissolved oxygen sensor.
The “D.O. sensor Set Up” allows for user entered
values for the salinity of the measured solution and the
ambient air pressure where at the installation site.

20
Advanced Sensor Technologies, Inc. U.S.A. Website: www.astisensor.com IOTRONTM Trademark of ASTI
IOTRONTM
pH / ORP / ISE / DO / Conductivity Measurement Products Lines
“Adjust Sensor Dampener” Menu
The available choices for sensor dampener of of the
sensor are shown to the right.
It can be desirable to reduce the dampening time before
performing calibration to expedite the calibration
process.
BE SURE TO RETURN THE DAMPENER BACK TO
THE APPROPRIATE HIGHER VALUES FOR USE IN
CONTINUOUS FIELD USE IF YOU RETURN THE
DAMPENER FOR FASTER CALIBRATIONS.
“Reset All Calibrations” Menu
This will reset ALL available calibrations back to the
values at time of dispatch from the factory.
Once the reset all calibrations call has been performed it
cannot be undone. With this in mind please be sure that
you wish to reset the calibrations before proceeding.
You may be asked to reset the calibrations on your
sensor as part of a troubleshooting in case you have
unusual calibration results.