Turtle Tough DSS HandHeld FIELD Communicator User manual

TURTLE
TOUGH
®
turtletoughsensors.com
MANUAL
DSS HANDHELD FIELD COMMUNICATOR
Dissolved Oxygen
DO

Product name DSS HandHeld Field Communicator
Code TT-HFC
Mechanical
Housing ABS
Mounng Handheld
IP Class Housing IP40
Connector Quick connect plug
Temperature Usage -15 to +50 °C (Storage -35 to +75 °C)
Weight 130 grams with baery (4.6 ounces) 100 grams without baery (3.5 ounces)
Dimensions D 26 x W 60 x H 120 mm (1.0” X 2.4” X 4.7”)
Electrical
Supply 9V baery (Alkaline or Lithium)
Consumpon ~45 mA with DSS sensor ‘On’
Baery life ~6 hrs Alkaline or ~12 hrs Lithium
Auto shutdown aer 25 seconds * without communicaon
Interface Smart Digital DSS Modbus RTU pH Sensors
Baud rate 9600 or 19,200 kbps (selectable)
CE mark EN61326A
* Number of seconds unl auto shutdown starts from when sensor is disconnected from HFC
DSS Handheld Field Communicator
Turtle Tough’s Handheld Field Communicator (HFC)
calibrates and congures DSS Smart Digital RS485
Modbus RTU sensors at any locaon. All values
stored in non-volale sensor EEPROM for hot-swap
portability when installed back into eld service.
Specicaons

Programming and Navigation
The Handheld Field communicator (HFC) has 3-digit display and 16 LEDs to show readings and analyc data
as well as to calibrate and congure sensor. Programming done by 4 key front panel. ‘Mode’ key used to toggle
and navigate to each LED. ‘Up’ or ‘Down’ buons scroll available opons and adjust values. ‘Mode’ key is used to
make selecons and save entries. ‘View’ key provides addional informaon for the given LED mode (see table for
details on use of ‘View’). Once baud rate and node of connected sensor are entered all parameters are automacally
loaded for zero conguraon plug and play use in the eld.
3-digit display
Use ‘Up’ or ‘Down’ buons
to scroll available opons
and adjust values.
Press ‘View’ for addional
informaon for the given
LED mode
Use ‘Mode’ key to make
selecons & save entries.

DSS Handheld Field Communicator for Calibraon, Conguraon,
Spot Measurement and Troubleshoong of DSS DO Sensors RS485 Modbus RTU
Led Label Parameter Descripon and Method to Access Range Default
Sensor Type Measurement type Load opons for connected sensor
‘View’ key shows soware revision
pH or ORP or DO or ISE or CON
(autodetected) Per Type
Reading***** Process Parameter****
Display current calibrated value
See Display Features for a detailed
explanaon of how to use this LED mode
0.0 to 150.0 ppm*
0 to 1,500 percent (%) saturaon*
Use ‘View’ key to show % sat
Per
Measured
Soluon
Abs mV / mS Process Parameter Display the absolute mV value from
connector dissolved oxygen sensor
0 to +250 (Negave mV values are not
possible for galvanic DO cell)
Per Sensor
& Media
Cal Temp. Oset calibraon of
temperature in °C **
Adjust temp reading up & down
‘View’ key shows current temp cal. ±25.0 °C * from raw value 0.0
Cal Oset Not Used for DO
Measurements N/A N/A N/A
Cal Slope Denes span (gain) for
DO Sensor **
mV per DO ppm units
‘View’ key shows current slope 0.70 to 6.00 mV per ppm unit 1.60
Dampener Smoothing dampener
& output delay ***
Sets number of seconds to be used
for dampener for process value(s) 1, 2, 3, 4, 5, 8, 10, 15, 20 or 30 Seconds 10- Dampen 1 - Delay
Step Change Sensivity for
‘Up’ & ‘Down’ buons
mV increment for each me the
‘Up’ or ‘Down’ buon is depressed
Choices:
0.05, 0.10, 0.20, 0.5, 1.0 or 2.0 0.10
Special Salinity to compute %
saturaon value
User entered salinity value in PSU to
compute percent (%) saturaon value 0.0 to 50.0 PSU 0.0
Baudrate Sets Baudrate for Com Toggle between 9600 or 19,200 kbps 9600 or 19,200 kbps Per Network
Node Sets Address for Com Chose a valid address on network From 001 to 247 Per Sensor
Item/Serial
Number
Sensor Item Number
and Serial Number
Item # denes model; ‘View’ shows
Serial # (unique traceable idener)
Item # from 1-9,999 with >999
Serial # per DSS Serial Number Scheme Per Sensor
Days in Use Total me DSS sensor
is energised
Increments me in use aer dispatch
from factory to track sensor lifeme
and predicve maintenance purposes
0-65,535 in units of days
(>999 displayed ashing)
Within ±2% accuracy
Per Sensor
Field Use
Max/Min °C Displays max & min
temp in eld use
The max temp in eld use is shown;
Push ‘View’ buon for min temp -40 to +210 °C * Per Sensor Field Use
* Negave values are always shown as ashing.
Color notes
Parameters in green are dened by factory at dispatch me or determined from eld use.
Parameters in grey can be adjusted as desired.
Parameters in blue are obtained from wet calibraons done with DSS sensor in the eld.
*HFC display maxes out at 99.9 for reading for DO ppm (actual max to 150) and 999 for DO % saturaon (actual max to 1,500)
** Holding the ‘View’ key for 3 to 5 seconds in this LED mode shows the ‘Days in Use’ since this calibraon was performed
** Holding both the ‘View’ and ‘Up’ keys for 3 to 5 seconds in this LED mode will reset all calibraon values back to default
*** Holding the ‘View’ key for 3 to 5 seconds allows for the delay from boot value to be shown as well as adjusted
**** Holding both ‘Up’ & ‘Mode’ keys shows soware rev or both ‘Down’ & ‘Mode’ keys shows build date in Reading LED mode
***** User Adjustable Timeout Feature: Press ‘Down’ + ‘View’ in ‘Reading’ mode to set minutes before automac shuto occurs
Note on Dissolved Oxygen Sensors When Values Are Greater Than 99.9 Ppm Or 999 % Saturaon
When the ppm value exceeds 99.9 it will not be shown (actual max value supported in output is 150ppm). When the computed percent (%)
saturaon value exceeds 999 it will not be shown on display (actual max value supported in output is 1,500%).
Note on DSS Dissolved Oxygen sensor slope calibraon
The DSS Smart Digital Dissolved Oxygen sensors will always have just a single slope and no oset. No oset calibraon is required for the
true galvanic cell since it has a true zero (0mV at 0ppm). The use of just a single slope is possible since the response of the industrial Turtle
tough’s dissolved oxygen (DO) smart digital sensor with Modbus RTU digital output is linear throughout the enre range dened by the mV
per ppm slope calibraon to dene the eecve span.
‘Modbus Com’ & ‘Baery Low’ LED
• The “Modbus Com” LED is illuminated briey each me that a communicaon packet is sent or received.
• The “Baery Low” LED will at rst ash as warning & then illuminate connuously when the 9V baery should be replaced.
o Must change 9V baery when LED is illuminated to ensure valid readings and calibraons.

Setup of DSS RS-485 Modbus RTU Sensor to Handheld Field Communicator
1. Instrucons for scanning and changing nodes on page 10.
2. Press the ‘Mode’ buon to turn on the Handheld Field Communicator. Once on, the HFC will aempt to
communicate with the last used baudrate and node address. If either no sensor is connected or available
at the last used baudrate and node address then three dashes “---” are shown on display. If no buons
are pressed for 25 seconds the Handheld Field Communicator will automacally turn itself o to conserve
baery life.
a) If previous baudrate and node address are valid for connected sensor the HHC will automacally load
all relevant LED opons and addressable parameters for that sensor type.
3. Pressing ‘Mode’ buon navigates to ‘Node’ LED mode. Use ‘Up’ & ‘Down’ keys to scroll to node of the con-
nected sensor. Node informaon is typically found on label of sensor. If this informaon is not available, the
DSS Windows soware can be used scan the sensor in queson to determine the current node address.
The baudrate and node address of the DSS sensors can only be changed by the Windows soware. When
the desired node address is reached press the ‘Mode’ key enter the value.
a) Default nodes: pH is 1, ORP is 2, Wide-Range ORP is 3, DO is 4, ISE is 5, Conducvity is 6. If mulple
sensors of same type are used on one Modbus RTU network then node address for each same type
sensor must dier from default to ensure a unique and valid node address.
4. If baudrate needs to be adjusted (9600 or 19,200 kbps) then the HFC automacally navigates to this LED
mode next.
5. HFC returns to reading mode aer selecng node and baudrate. If the selecons are valid then the process
reading is shown otherwise three dashes “---” are shown.
6. Press ‘Mode’ buon aer reading LED to toggle to sensor type LED which shows type of sensor that is
connected.
Sensor Serial Number, Item Number and Total Time in Field Service
Systemac tracking achieved with factory stamped sensor serial and item number. The internal clock on the
DSS sensor board is incremented when energized to monitor the total number of days in acve eld service.
If the sensor is disconnected the incremenng of the me in service will stop. When the sensor is energized
the incremenng of me in service will once again resume. The number of days in service is always the actual
real-me total usage. The total days in use is shown in days and equally accurate for connuous or intermient
service such that the me in service is accurate even if the sensor is taken in and out of use for cleaning and
re-calibraon and/or swapped between dierent installaons. The total me in service since each calibraon
was performed is shown when the ‘View’ key is pressed for 3 to 5 seconds in the given calibraon LED mode.

Important note before performing calibraons
The me averaging dampener is always on even when performing calibraons. It can be desirable to adjust
dampener to a short value when performing calibraons to make the calibraon process quicker and then reset
the dampener back to a higher value before reinstalling the sensor back into connuous use in eld service
(be sure to remember this last step!)
Temperature Calibraon Instrucons
The temperature is calibrated by pushing the ‘Up’ or ‘Down’ buons when in the temperature display (°C) mode. *
Calibraon of Dissolve Oxygen DSS Sensors with Handheld Field Communicator
1. Use the ‘Mode’ buon to toggle to ‘Cal Slope’ LED.
2. Use ‘Up’ and ‘Down’ keys unl the display reads ‘CaL’.
3. Press the ‘Mode’ buon to invoke the automac calibraon roune. The display will show ‘YES’. Press the
‘Mode’ buon to complete the auto-calibraon. The HFC will return back to the ‘Reading’ LED mode upon
compleon.
a. The Dissolved Oxygen DSS Modbus RTU sensor automacally computes the dissolved oxygen ppm
levels that constutes the 100% saturaon condion to perform a dry in air calibraon including the
measured current temperature as well as the user entered barometric pressure.
b. When you complete the autocalibraon the percent saturaon reading will be 100 percent (%) saturaon.
The percent saturaon units can be seen by pressing the ‘View’ key in the ‘Reading’ LED mode.
4. All calibraon values are stored inside the Dissolved Oxygen DSS sensor in EEPROM such that sensor can
be powered down or moved without loss of calibraon values resulng in a true plug and play measurement
system with seamless hot-swap of sensor in eld.
5. Results of the performed DO-DSS sensor calibraons can be viewed by pressing the ‘View’ key in each
calibraon LED mode. The units are mV per Dissolved Oxygen ppm for the slope value used throughout the
enrety of the range.
*Negave values shown as ashing.

Calibraon Instrucons for Dissolved Oxygen DSS Sensors
Turtle Tough’s Dissolved Oxygen DSS sensors do not require oset calibraon as they have a true 0mV potenal
at 0ppm dissolved oxygen. Accordingly, the ‘Oset’ LED is skipped on the Handheld Field Communicator when
toggling through the LED modes. Calibraon of the dissolved oxygen sensor is then only performed in the
‘Slope’ LED mode. Remove the dissolved oxygen sensor from service and allow sucient me for the temperature
and sensor reading to be stable to ensure a good gain calibraon result. Perform the slope calibraon (a.k.a.
gain) when the sensor is clean and dry and exposed only to air. If the relave humidity is not 100%, suspend the
sensor in the air over a source of water for best results. Be sure to wait a sucient me unl the sensor reading
is stable before performing the span (slope) calibraon. The days in use since the calibraon was last performed
is saved in the sensor EEPROM and accessible via RS-485 Modbus RTU.
IMPORTANT: Perform precise temperature calibraon before slope (a.k.a. gain) calibraon on DO sensor.
The correct 100% saturaon value at any temperature from -5 to +50°C is programmed in the DO-DSS sensor
board soware allowing for a fully automated calibraon procedure.
Temperature Calibraon Instrucons
The temperature is calibrated by pushing the ‘Up’ or ‘Down’ buons when in the temperature display (°C) mode. *
* Negave values shown as ashing.
Important note for powering DSS Sensors
• The RS-485 Modbus RTU digital output from the DSS smart digital sensors is non-isolated.
o Power source that energizes sensor should be isolated (dedicated and separate from all other devices) or
o DC/DC converter/isolator can be added to the exisng power supply employed to accomplish the same
net result as having a dedicated separate 9V to 12V DC power source.
o Device that will serve as RS-485 MODBUS RTU master should have an isolated serial input port

Automac Calculaon of Theorecal 100% Dissolved Oxygen Saturaon
at any Temperature & Pressure for Accurate Calibraon & Measurement
The DO-DSS sensor has preprogrammed the correct 100% dissolved oxygen saturaon levels valid at any
temperature and pressure. This is important for two main purposes: 1) to ensure accurate calibraon of the
sensor which is performed dry in air and 2) when the percent (%) saturaon is displayed and output for purposes
of monitoring and control. The graph below demonstrate the impact of both temperature and pressure on the
dissolved oxygen (DO) ppm levels that constute 100% saturaon condion.
For the calibraon funcon, either the eld condion should be 100% relave humidity for best accuracy or
else the sensor should be suspended dry in air but over a water source to simulate locally the 100% relave
humidity condion. The water molecule in air (humidity) is then saturated with oxygen in manner that can be fully
described by the ambient temperature and pressure as shown above. When placed into service, the galvanic DO
sensor will measure the ppm levels at the installaon depth. To convert this measured ppm value into percent (%)
saturaon the DO-DSS sensor uses the internally stored curve visualizaon below.

Automac Calculaon of Theorecal 100% Dissolved Oxygen Saturaon
at any Temperature & Pressure for Accurate Calibraon & Measurement
The DO-DSS has preprogrammed the correct 100% dissolved oxygen saturaon levels valid at not only any
temperature and pressure but also corrected for salinity. This is important for applicaons, where not only
freshwater will be present, but also for brackish and saltwater sources in variable amounts. The graph below
demonstrates the impact of salinity on the dissolved oxygen (DO) ppm levels that constute 100% saturaon
condion at the nominal 760mm pressure condion. For simplicity of visualizaon, just one set of curves is
shown although the analyser can perform this compensaon any temperature, pressure or salinity.
This salinity correcon is only required as a correcon to the computaon of the % saturaon from the
measured DO ppm levels for the inline measurement. Since the calibraon is done dry in the air, salinity
correcon is not required for this part of the operaon. Since the impact of salinity is considerable as shown
in the graph above, it must be corrected carefully at any level of salinity and temperature. The salinity value
in standard PSU (PPT) units can be entered into the dissolved oxygen sensor to perform this correcon. The
value of the salinity can be determined by a handheld meter or else monitoring connuously using a conducvity
transmier from which one can readily convert into common salinity units.

Notes on adjustable smoothing dampener and output delay
• Dampener LED when Dissolved Oxygen DSS sensor is connected allows for display and modicaon of the
variable that is used to set the number of seconds used for the smoothing dampener and delay from boot
to send the output values
• For intermient operaon, it is recommended to set this dampener and output delay variable to a low number
in order to minimize power consumpon while from baery power sources and maximize sampling me of
process output
Display features available using the ‘VIEW’ key
• In ‘Node’ mode press ‘View’ key to invoke the node scanning feature *
• In ‘Baud Rate’ mode press ‘View’ key for 3 to 5 seconds to invoke node changing mode. **
• In ‘Sensor Type’ LED mode, the soware revision for the connected sensor is shown when the ‘View’ key is pressed.
• In ‘Reading’ LED mode, the displayed units are ppm. Pressing ‘View’ key returns reading in percent (%) saturaon
units. The computaon of the percent (%) saturaon units is preprogrammed in Dissolved oxygen DSS
sensors at the factory including correcons for the air pressure, temperature and salinity.
o To view the percent (%) saturaon excluding the salinity hold ‘View’ key for 3 to 5 seconds. This percent
(%) saturaon excluding the salinity is the one to be used when sensor is dry in air during calibraon procedure.
• In ‘Cal Temp.’ LED mode, the oset in °C * for current temp calibraon is shown when the ‘View’ key is pressed.
• In ‘Cal Slope’ LED mode, the current slope for the connected DSS dissolved oxygen sensor is shown when the
‘View’ key is pressed in mV per DO ppm units.
o Days since this calibraon performed shown by holding ‘View’ in the ‘Cal’ mode for 3 to 5 seconds.
If both ‘View’ & ‘Up’ pressed for 3 to 5 seconds in any ‘Cal’ mode will reset all calibraons back to factory
default
* Node scanning feature, instrucons:
• Inial node of ‘0’ will be shown (press ‘Mode’ when node address is ‘0’ to exit scan mode).
• Select starng address for scan with ‘Up’ or ‘Down’ keys. Node address scrolled in increments of 10. For example, pressing ‘Up’ key gives
address of 1102030… and so forth while pressing ‘Down’ key gives addresses of240230220… and so forth.
• Press ‘Mode’ to begin scan. Scanning is always performed in an ascending fashion. Scan will stop when sensor is found. Sensor type for node
address found displayed ashing with node address.
• Press ‘Mode’ to select this node and you will enter ‘Reading’ mode.
• Press ‘View’ to connue scanning. If no sensors found when address 247 is reached, then ‘Err’ is displayed. Press ‘Mode’ to resume scan and
repeat these procedures.
* * Node changing mode notes:
• Select the current node for the aached sensor. If the current node is not known use the node scanning feature to determine it. When in the
‘Baud Rate’ LED mode, hold the ‘View’ key for at least 3 seconds to iniate the node changing mode. The current node of the sensor will be
shown and the ‘Sensor Type’ and ‘Node’ LED will ash.
• If the ‘Mode’ key is pressed immediately aer entering this node changing mode, then no change to the address will be made since the address
displayed will equal the current node address.
• Use ‘Up’ and ‘Down’ keys to adjust the node to the modied address if desired.
• Press ‘Mode’ key to enter the new node address selected with ‘Up’ & ‘Down keys.