Agrowtek SXH User manual

1© Agrowtek Inc. | www.agrowtek.com
Technology to Help You Grow
AGROWtEK
INSTRUCTION MANUAL
SXH/SXH+
Hydroponics Sensor Transmitter & Data Logger
Temperature, pH, EC (+ORP/DO)
Contents
Dimensions 2
Installation Instructions 2
pH & ORP Probe Preparation 3
Mounting the Transmitter 4
DIN Rail Mounting Kit 4
Connecting Sensor Probes 4
Connection to ADi Pump 5
Cross-Over Cable 5
LCD Menu Operation Instructions 6
High / Low History 6
Graphing 6
Main Menu 7
Alarms Menu 7
Alarms Conguration 7
Alarm Buzzer 8
Calibration Menu 8
Clear Calibration 8
Temperature Calibration 9
pH Calibration 9
Conductivity Calibration 10
O.R.P. Calibration 10
D.O. Calibration 11
D.O. Saturation Chart 12
Advanced Calibration 13
Analog Output Calibration 13
Setup Menu 14
Time / Date 14
Units 14
Logging Interval 15
COMM Mode 16
Device Address 16
Manufacturing Info 16
Display Back Light Timer 17
Connection to 4-20mA Outputs 17
Connection to USB AgrowLINK 17
Connection to MODBUS RTU 18
HX8 8-Port Hubs 18
Serial Speed & Format 18
Supported Commands 19
Register Types 19
Sensor Value Registers 19
Calibration Registers 19
MODBUS Register Map 20
Maintenance 21
Probe Cleaning 21
pH Probe Reconditioning 21
Technical Information 22
Specications 22
Storage and Disposal 22
Warranty 22
Shown with optional sensor probes

2© Agrowtek Inc. | www.agrowtek.com
5.0
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U.S.A.
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GrowNET
Link Port
MODBUS
TM Digital Water Sensor
Logger & Controller
TEMPERATURE CONDUCTIVITYpH O.R.P. / D.O.
GrowControl
TM
pH
Probe
o.r.p./d.o.
Probe
Temp Probe | EC Probe
red blk wht | clr red blk
BNC pH Probe
(optional) BNC ORP/DO Probe
Temperature & Conductivity
Probes
GrowNET Port
RS485 MODBUS
Color LCD Display
Button Interface
(optional)
12-24V DC Power Input Jack
or MINI-DIN6 Analog Connector (shwon)
Dimensions
Do NOT connect the GrowNET port to Ethernet networks.
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U.S.A.
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GrowNET
Link Port
MODBUS
TM
Digital Water Sensor
Logger & Controller
TEMPERATURE CONDUCTIVITYpH O.R.P. / D.O.
GrowControl
TM
pH
Probe
o.r.p./d.o.
Probe
Temp Probe | EC Probe
red blk wht | clr red blk
FROM
SAMPLE
PUMP
WATER
TANK
RETURN
PBX-310
Sensor Manifold
1” NPT
Connections
(optional)
Installation Instructions
Install with the connections facing down to reduce
the risk of water permeating the enclosure.
Avoid locations with dripping water or heavy splash
risk; the transmitter is best kept dry for longest life
and highest accuracy.
A probe manifold with recirulating pump (3-30gpm) is
recommended for best sensor accuracy.
IMPORTANT NOTE: For ow rates above 5 gpm,
ensure probe tips are raised out of the ow path to
prevent turbulence altering the sensor readings.

3© Agrowtek Inc. | www.agrowtek.com
pH & ORP Probe Preparation
Probe Shipping & Storage
pH & ORP probes are shipped in a plastic bottle containing a
solution of pH 4 buer and potassium chloride. The electrode
should remain in the bottle until it is used.
If the electrode is used infrequently, the bottle and its solution
should be saved and the electrode stored in it. If the solution in
the soaker bottle is missing, ll the bottle with pH 4 buer.
Take out electrode by loosening plastic top on bottle counter-
clockwise and pulling electrode out. Slide cap and O-ring o
electrode and save.
BL
ACK
O-RING
INSIDE
TOP
Black
O-ring
inside
Air Bubble
During shipment the air bubble in the
electrode’s stem may move into the bulb
area.
If bubbles are seen in the bulb area, hold
the electrode by its top cap and shake
while pointed downward.
ELB BUBRIA
AIR BUBBLE
Installation/Operation Angle
pH & ORP sensor probes must be installed in an above-horizontal position
with the probe tip facing downward to prevent the air bubble from entering
the the bulb area.
10° min.

4© Agrowtek Inc. | www.agrowtek.com
pH and ORP or DO sensors are equipped with“BNC” style connectors which push on and then turn 1/4 rota-
tion CW to lock them in place. Temperature and EC probes have a screw terminal block; make the connec-
tions according to the label on the transmitter. The terminal block may be removed for easier wire installa-
tion or for service.
Connecting Sensor Probes
pH
Probe
o.r.p./d.o.
Probe
Temp Probe | EC Probe
red blk wht | clr red blk
Wall mounting tabs are provided for installing against a vertical wall surface.
1. Measure out the hole locations per the dimensions, or mark the holes using the transmitter as a template.
2. Drill holes and install anchors (if required, not included.) Keep the transmitter away from dust during work.
3. Install the transmitter to the wall surface using appropriate screws.
Mounting the Transmitter
A DIN rail mounting kit installs onto the mounting anges with the provided hard-
ware for mounting the device on a standard DIN rail.
1. Screw the DIN rail brackets onto the anges using the provided screws.
2. Snap the transmitter into place on a DIN rail.
3. Use the latches on the DIN brackets to release the transmitter from the DIN rail.
DIN Rail Mounting Kit
pH & ORP probes must remain wet to avoid damage. Do not allow probe tips to dry.

5© Agrowtek Inc. | www.agrowtek.com
Agrowtek
Cross-Over
Adapter
cat5 cat5
Connection to ADi Pump
A direct-link connection between a SXHM sensor and ADi pump requires Agrowtek’s cross-over adapter.
IMPORTANT! ONLY use cross-over adapters provided by Agrowtek. Do not use other cross-over adapters or cross-over
cables unless they are constructed exactly as diagramed on the cross-over diagram. Incorrect cross-over adapters or cables
can cause damage to the equipment.
12Vdc 1A
Power Supply
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AGROWtEK
U.S.A.
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© Arowtek Inc. | www.agrowtek.com
GrowNET
Link Port
MODBUS
TM
Digital Water Sensor
Logger & Controller
TEMPERATURE CONDUCTIVITY
pH O.R.P. / D.O.
GrowControl
TM
pH
Probe
o.r.p./d.o.
Probe
Temp Probe | EC Probe
red blk wht | clr red blk
Cross-Over Cable
A custom cross-over cable can be constructed as an alternative to
using the cross-over adapter and two standard, straight Ethernet
cables as shown in the diagram above.
The cross-over wiring MUST match the diagram. Pins 7 & 8 carry
24Vdc power and must be straight through or damage may re-
sult to the equipment.

6© Agrowtek Inc. | www.agrowtek.com
SXHM models with the optional
3-button/LCD display interface may
be used for stand-alone monitoring
applications or as part of a control
solution.
Connect to Agrowtek’s GrowControl
facility control systems, or directly to
Agrowtek’s AgrowDose pumps for
automatic nutrient and pH control.
LCD Menu Operation Instructions
Simple minimum and maximum recorded values are stored until the user resets
the values to the current readings. To view the minimum and maximum values
since the last reset, press the button labeled H/L.
To clear the min/max history, press the RST button to reset. The min and max
values will all be set to the current readings and will update with higher or lower
readings as they occur.
High / Low History
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
The main screen displays the real-time sensor readings from the attached sensors. Each button is labeled at
the bottom of the display to describe it’s function on the current screen or menu.
RSTEXIT
72.0
4.85
657
480
°F
pH
mV
68.4
4.21
551
404
HIGHLOW
uS
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
© Arowtek Inc. | www.agrowtek.com
GrowNET
Link Port
MODBUS
TM Digital Water Sensor
Logger & Controller
TEMPERATURE CONDUCTIVITYpH O.R.P. / D.O.
GrowControl
TM
pH
Probe
o.r.p./d.o.
Probe
Temp Probe | EC Probe
red blk wht | clr red blk
GPH MNUH/L
72.0
6.21
550
°F
pH
uS
The display can graph the most recent 120
data points from the sensor’s internal data
point memory. With the default logging
interval of 60 seconds, the graph displays
the last two hours of data.
The sensor value is plotted in green. Tem-
perature, if overlaid on the plot, is red.
Alarm levels as set by the user are plotted in
yellow. Pressing the RFH button refreshes
the data and replots the graph.
Graphing
RFH BCK
PH
High Alarm
Low Alarm
Temperature
Sensor Data (pH)
GPH
MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
BACK
TEMPERATURE
PH
COND
GRAPH
ORP

7© Agrowtek Inc. | www.agrowtek.com
The main menu is how the alarms are set, sensors are calibrated and general
settings such as time, date and units are congured.
If a dosing pump is directly connected to the SXHM GrowNET port, the pump
settings are also accessed by the main menu.
Use the UP or DWN buttons to navigate the menu.
Use the ENT button to enter a selection.
Main Menu
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
High and low alarm set points may be congured for each sensor value to
activate an internal buzzer or send alerts with the optional wi module.
The out-of-range value will be displayed in red to indicate the cause for the
alarm.
Additionally, alarm limits are plotted on the graphs to indicate values are
within the desired range.
Alarms Menu
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
MENU
DWN ENTUP
BACK
+0.1
-0.1
SET LOW
0.0°F
1. Select ALARMS
from the main menu.
3. Select the setting
to adjust.
2. Select a sensor to
congure set points.
4. Adjust to the desired
value. Hold UP or DWN
to jog the value.
DWN ENTUP
BACK
LOW: 0.0
HIGH: 0.0
ALARM: OFF
ALARM
DWN ENTUP
BACK
TEMPERATURE
PH
COND
ALARMS
ORP
Alarms Conguration
GPH MNUH/L
72.0
5.14
1550
600
°F
pH
uS
mV

8© Agrowtek Inc. | www.agrowtek.com
To disable the alarm buzzer,
set the alarm to OFF.
Calibration Menu
Calibration can be performed for each sensor with the
LCD interface using either standard calibration wizards,
or advanced manual calibration methods for non-stan-
dard calibration solutions.
The date of the last calibration for each sensor is stored
in memory and displayed at the start of each calibration
wizard.
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
MENU
DWN ENTUP
BACK
TEMPERATURE
PH
COND
CALIBRATION
CLEAR ALL
DWN ENTUP
BACK
LOW: 0.0
HIGH: 0.0
ALARM: OFF
ALARM
1. Select ALARM: OFF
DWN ENTUP
BACK
SET ON
SET OFF
SET ALARM
OFF
2. Select SET ON then
press BACK to exit.
Alarm Buzzer
1. Select CLEAR ALL
from the calibration
menu.
2. Press YES to restore
factory calibration.
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
Clear Calibration
Calibration can be restored to factory defaults by selecting CLEAR ALL.
NOYES
RESTORE TO
FACTORY
CALIBRATION?
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
TEMPERATURE
PH
COND
CALIBRATION
CLEAR ALL

9© Agrowtek Inc. | www.agrowtek.com
pH calibration is a two-point process requiring both pH 7 and pH 4.01 calibration solutions. The temperature
probe must be inserted into the calibration solution at the same time as the pH probe.
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
pH Calibration
2. Follow the instruc-
tions then press NEXT.
4. Clean the probes with DI/RO
and change calibration solution.
3. When the reading
is stable, press NEXT.
5. When the reading is stable, press DONE
to calibrate pH 4.01 and nish calibration.
NEXTEXIT
PH
LAST CALIBRATION
10/19/2017
STEP 1:
PUT TEMPERATURE
AND PH PROBE IN
PH7 SOLUTION.
NEXTEXIT
PH
WAIT FOR READING
TO STABILIZE THEN
PRESS NEXT.
7.12 pH
NEXTEXIT
PH
STEP 2:
PUT TEMPERATURE
AND PH PROBE IN
PH4.01 SOLUTION.
7.00 pH
DNEEXIT
PH
WAIT FOR READING
TO STABILIZE THEN
PRESS DONE.
4.14 pH
pH 7 Calibration
Solution
pH 4.01 Calibra-
tion Solution
1. Select CALIBRATE
from calibration menu.
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
DWN ENTUP
BACK
TEMPERATURE
PH
COND
CALIBRATION
DO
1. Select CALIBRATE
from calibration menu.
3. Adjust to the desired
value. Hold ENT to jog
the value by 10x.
2. Press NEXT to con-
tinue.
4. Conrm the new
reading or press NO.
DWN ENTUP
BACK
+0.1
-0.1
OFFSET
72.2°F
NEXTEXIT
TEMPERATURE
LAST CALIBRATION
10/19/2017
PRESS NEXT TO
ADJUST
TEMPERATURE
READING.
NOYES
CONFIRM?
72.2 °F
68.1 °F
OLD
NEW
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
Temperature Calibration
DWN ENTUP
BACK
TEMPERATURE
PH
COND
CALIBRATION
DO

10 © Agrowtek Inc. | www.agrowtek.com
1. Select CALIBRATE
from the conductivity
calibration menu.
3. When the reading is
stable, press DONE to
complete the calibration.
2. Follow the instruc-
tions then press NEXT
to continue.
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
Conductivity Calibration
Conductivity calibration is a single point process requiring 1413 uS calibration solution. The temperature
probe must be inserted into the calibration solution at the same time as the conductivity probe.
NEXTEXIT
CONDUCTIVITY
LAST CALIBRATION
10/19/2017
PUT TEMPERATURE
AND EC PROBE IN
1413uS SOLUTION.
1. Select CALIBRATE
from the conductivity
calibration menu.
3. When the reading is
stable, press DONE to
complete the calibration.
2. Follow the instruc-
tions then press NEXT
to continue.
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
O.R.P. Calibration
ORP (optional) calibration is a single point process requiring 470 mV calibration solution.
NEXTEXIT
ORP
LAST CALIBRATION
10/19/2017
PUT ORP PROBE IN
470mV SOLUTION.
DNEEXIT
CONDUCTIVITY
WAIT FOR READING
TO STABILIZE THEN
PRESS DONE.
1440 uS
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DNEEXIT
CONDUCTIVITY
WAIT FOR READING
TO STABILIZE THEN
PRESS DONE.
1440 uS
DWN ENTUP
BACK
TEMPERATURE
PH
COND
CALIBRATION
DO
DWN ENTUP
BACK
ORP
CLEAR ALL
CALIBRATION

11 © Agrowtek Inc. | www.agrowtek.com
1. Select CALIBRATE
from the conductivity
calibration menu.
3. When the reading is
stable, press DONE to
complete the calibration.
2. Follow the instruc-
tions then press NEXT
to continue.
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
D.O. Calibration
DO Calibration is a two-point process requiring zero-oxygen solution and either air or saturated solution.
NEXTEXIT
DO
LAST CALIBRATION
10/19/2017
PUT DO PROBE IN
ZERO OXYGEN
SOLUTION.
NXTEXIT
DO
WAIT FOR READING
TO STABILIZE THEN
PRESS NEXT.
1.2 mg/L
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
TEMPERATURE
PH
COND
CALIBRATION
DO
5. When the reading is
stable, press NEXT to
adjust the saturation
calibration.
4. Follow the instruc-
tions then press NEXT
to continue.
NEXTEXIT
DO
PUT DO PROBE IN
AIR.
NXTEXIT
DO
WAIT FOR READING
TO STABILIZE THEN
PRESS NEXT.
12.7mg/L
6. Adjust the saturation
value according to the chart
on the following page.
DWN ENTUP
DONE
+0.1
-0.1
DO
11.5 mg/L

12 © Agrowtek Inc. | www.agrowtek.com
D.O. Saturation Chart
The saturation concentation must be calculated manually using the standard reference chart below. Use the
reference value from the chart to determine the calibration for the probe at 100% saturation.
Oxygen Saturation Table (in mg/l or ppm)
(assume elevation at sea level and 100% water saturation of air above sample)
) ppm/1000tpp(ytinilaSpmeT
(°C) 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34
014.6 14.4 14.2 14.0 13.8 13.6 13.4 13.3 13.1 12.9 12.7 12.6 12.4 12.2 12.0 11.9 11.7 11.6
114.2 14.0 13.8 13.6 13.4 13.3 13.1 12.9 12.7 12.6 12.4 12.2 12.1 11.9 11.7 11.6 11.4 11.3
213.8 13.6 13.4 13.3 13.1 12.9 12.7 12.6 12.4 12.2 12.1 11.9 11.7 11.6 11.4 11.3 11.1 11.0
313.4 13.3 13.1 12.9 12.7 12.6 12.4 12.2 12.1 11.9 11.8 11.6 11.4 11.3 11.1 11.0 10.8 10.7
413.1 12.9 12.7 12.6 12.4 12.2 12.1 11.9 11.8 11.6 11.5 11.3 11.2 11.0 10.9 10.7 10.6 10.4
512.7 12.6 12.4 12.3 12.1 11.9 11.8 11.6 11.5 11.3 11.2 11.0 10.9 10.7 10.6 10.5 10.3 10.2
612.4 12.3 12.1 11.9 11.8 11.6 11.5 11.3 11.2 11.0 10.9 10.8 10.6 10.5 10.3 10.2 10.1 9.9
712.1 12.0 11.8 11.7 11.5 11.4 11.2 11.1 10.9 10.8 10.6 10.5 10.4 10.2 10.1 10.0 9.8 9.7
811.8 11.7 11.5 11.4 11.2 11.1 10.9 10.8 10.7 10.5 10.4 10.3 10.1 10.0 9.9 9.7 9.6 9.5
911.5 11.4 11.2 11.1 11.0 10.8 10.7 10.5 10.4 10.3 10.2 10.0 9.9 9.8 9.6 9.5 9.4 9.3
10 11.3 11.1 11.0 10.8 10.7 10.6 10.4 10.3 10.2 10.0 9.9 9.8 9.7 9.6 9.4 9.3 9.2 9.1
11 11.0 10.9 10.7 10.6 10.5 10.3 10.2 10.1 9.9 9.8 9.7 9.6 9.5 9.3 9.2 9.1 9.0 8.9
12 10.8 10.6 10.5 10.4 10.2 10.1 10.0 9.9 9.7 9.6 9.5 9.4 9.3 9.1 9.0 8.9 8.8 8.7
13 10.5 10.4 10.3 10.1 10.0 9.9 9.8 9.6 9.5 9.4 9.3 9.2 9.1 8.9 8.8 8.7 8.6 8.5
14 10.3 10.2 10.0 9.9 9.8 9.7 9.6 9.4 9.3 9.2 9.1 9.0 8.9 8.8 8.7 8.5 8.4 8.3
15 10.1 9.9 9.8 9.7 9.6 9.5 9.3 9.2 9.1 9.0 8.9 8.8 8.7 8.6 8.5 8.4 8.3 8.2
16 9.8 9.7 9.6 9.5 9.4 9.3 9.2 9.0 8.9 8.8 8.7 8.6 8.5 8.4 8.3 8.2 8.1 8.0
17 9.6 9.5 9.4 9.3 9.2 9.1 9.0 8.9 8.8 8.6 8.5 8.4 8.3 8.2 8.1 8.0 7.9 7.9
18 9.4 9.3 9.2 9.1 9.0 8.9 8.8 8.7 8.6 8.5 8.4 8.3 8.2 8.1 8.0 7.9 7.8 7.7
19 9.3 9.1 9.0 8.9 8.8 8.7 8.6 8.5 8.4 8.3 8.2 8.1 8.0 7.9 7.8 7.7 7.6 7.6
20 9.1 9.0 8.9 8.8 8.6 8.5 8.4 8.3 8.2 8.2 8.1 8.0 7.9 7.8 7.7 7.6 7.5 7.4
21 8.9 8.8 8.7 8.6 8.5 8.4 8.3 8.2 8.1 8.0 7.9 7.8 7.7 7.6 7.5 7.5 7.4 7.3
22 8.7 8.6 8.5 8.4 8.3 8.2 8.1 8.0 7.9 7.9 7.8 7.7 7.6 7.5 7.4 7.3 7.2 7.2
23 8.6 8.5 8.4 8.3 8.2 8.1 8.0 7.9 7.8 7.7 7.6 7.5 7.4 7.4 7.3 7.2 7.1 7.0
24 8.4 8.3 8.2 8.1 8.0 7.9 7.8 7.7 7.7 7.6 7.5 7.4 7.3 7.2 7.1 7.1 7.0 6.9
25 8.2 8.1 8.1 8.0 7.9 7.8 7.7 7.6 7.5 7.4 7.3 7.3 7.2 7.1 7.0 6.9 6.9 6.8
26 8.1 8.0 7.9 7.8 7.7 7.6 7.6 7.5 7.4 7.3 7.2 7.1 7.1 7.0 6.9 6.8 6.7 6.7
27 7.9 7.9 7.8 7.7 7.6 7.5 7.4 7.3 7.3 7.2 7.1 7.0 6.9 6.9 6.8 6.7 6.6 6.6
28 7.8 7.7 7.6 7.5 7.5 7.4 7.3 7.2 7.1 7.1 7.0 6.9 6.8 6.7 6.7 6.6 6.5 6.5
29 7.7 7.6 7.5 7.4 7.3 7.3 7.2 7.1 7.0 6.9 6.9 6.8 6.7 6.6 6.6 6.5 6.4 6.3
30 7.5 7.4 7.4 7.3 7.2 7.1 7.1 7.0 6.9 6.8 6.7 6.7 6.6 6.5 6.5 6.4 6.3 6.2
This table uses the formula % saturation =
= EXP(-173.4292+249.6339*100/T+143.3483*LN(+T/100)-21.8492*T/100+S*(-0.033096+0.014259*T/100-0.0017*(T/100)^2))*1.4276
where S is salinity in ppt and T is degrees Kelvin (=C+273.15)
Formula from Grasshoff, K., et al. (1999), and is generally accurate to 0.1 ppm to empirical studies.
Saturation values are for 760 mm mercury (29.92"). During a high pressure system, saturation values may be 0.4 ppm higher.
During a low pressure system, saturation may be 0.5 ppm lower.

13 © Agrowtek Inc. | www.agrowtek.com
Advanced Calibration
Sensors values may be manually calibrated to alternate standards using the
advance calibration features.
OFFSET calibration applies a linear oset adjustment to the value.
SPAN calibration applies an adjustment to the slope of the sensor value.
Note: pH and conductivty are temperature compensated (ATC) sensors. For
accurate calibration, the temperature probe must be in the pH and conduc-
tivity calibration standards. Allow all readings to stabilize before performing
an oset or span calibration operation.
PH
CAL 7 sets the pH 7 calibration (oset.) Cal 7 automatically clears span calibration point prior performing pH
7 calibration.
SPAN calibration is performed typically at pH 4.01 or 10.0 (Always perform pH 7 calibration rst.)
CONDUCTIVITY
SET CAL 0 calibrates a dry EC probe if required. (not recommended)
SPAN calibration is recommended at 1413uS. If using ppm standards, ensure the display is in the correct
units.
DiSSOLVED OXYGEN (D.O.)
OFFSET calibration is recommended in zero oxygen solution.
SPAN calibration is recommended at a known DO level or in air.
OXIDATION REDUCTION POTENTIAL (O.R.P.)
OFFSET is recommended at 270mV
SPAN is recommended at 470mV
DWN ENTUP
BACK
CALIBRATE
ADVANCED
CALIBRATION
4-20mA analog outputs may also be calibrated with a positive or negative
oset to compensate for variation in DAC’s/ADC’s. The sensors’current output
may be incrementally increased or decreased in steps of 0.005mA over a range
of +/-2mA.
1 Oset bit = 0.005mA, Range = +/-400 bits (+/-2mA)
This calibration procedure is optional and only for use with custom PLC appli-
cations.
1. Observe the PLC’s input or data readings.
2. Increase or decrease the oset value to incremenetally adjust the current output until the values match.
Analog Output Calibration
DWN ENTUP
BACK
+1
-1
ANALOG
-5

14 © Agrowtek Inc. | www.agrowtek.com
The setup menu is where the time and date are
set, the units are congured, logging interval is
adjusted and advanced communications settings
are available.
Setup Menu
Sensors include a precision real-time clock with battery back-up for time-stamping the data log information
with the time and date. The last calibration for each sensor is also time stamped.
Time / Date
1. Select TIME/DATE
from the setup menu.
3. Use NXT to select
the value to adjust.
Use +to increment the
value.
2. Select TIME or
DATE to adjust.
4. Use EXT to exit the
menu.
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
TIME
DATE
TIME/DATE
+ EXTNXT
DATE
10/20
2017
+ EXTNXT
TIME
13:37:51
Temperature and Conductivity may be displayed
in alternate units.
Select a sensor value to change the default display
and working units.
Units
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
TEMPERATURE
EC
UNIT SELECT
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT

15 © Agrowtek Inc. | www.agrowtek.com
Adjust the interval for recording data points in the
on-board memort. Acceptable values are from 1 -
65535 seconds.
21,600 data points can be stored for each sensor
value. The most recent 120 data points are shown
on the graphical history.
The entire data history may be downloaded from
the sensor to a .csv le with the LX1 USB AgrowLINK
and free software.
Note: 60 second intervals = 15 days of data storage.
Logging Interval
Congure temperature units:
1. Select TEMPERATURE
from the units menu.
2. Select the desired
units and press ENT.
DWN ENTUP
BACK
TEMPERATURE
EC
UNIT SELECT
Temperature may be displayed in °F or °C.
Note: Check alarm settings when converting
temperature units.
DWN ENTUP
BACK
°C
°F
UNIT SELECT
68.0°F
Congure conductivity units:
1. Select EC from the
units menu.
2. Select the desired
units and press ENT.
Conductivity may be displayed in default units of
microSiemens (uS) or total dissolved solids in parts
per million (ppm.)
The TDS conversion factor used by this meter is 500.
TDSppm = uS x 0.5
DWN ENTUP
BACK
TEMPERATURE
EC
UNIT SELECT
DWN ENTUP
BACK
US
TDS
UNIT SELECT
654 ppm
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
1. Select LOG INTERVAL
from the setup menu.
2. Adjust the value
then select BACK.
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
+1
-1
LOGGIN INTERVAL
60 SEC

16 © Agrowtek Inc. | www.agrowtek.com
COMM mode species whether the sensor is a
normal passive device or“mini-master” device.
NORMAL Use with GrowControl master controller
systems or stand-alone and data logging applica-
tions.
MINI-MASTER Use with MDX mini-dosing system.
(GrowNET cross-over adapter required.)
COMM Mode
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
1. Select COMM from
the setup menu.
2. Select a mode and
press ENT.
Sensors are digitally addressable from 1-249 and
will be assigned an address automatically by
Agrowtek’s control systems, or can be congured
manually for MODBUS applications via the menu.
NOTE: All of Agrowtek’s devices use address 254 as
a broadcast address.
Device Address
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
1. Select DEVICE ADD
from the setup menu.
2. Adjust the value
then select BACK.
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
DWN ENTUP
BACK
+1
-1
DEVICE ADDRESS
0 Addr
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
DWN ENTUP
NORMAL
MINI MASTER
COM MODE
Manufacturing Info
GPH
MNU
H/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
Manufacturer information such as serial number,
date of manufacture, hardware and rmware
versions can be read from the MFG INFO page.
1. Select MFG INFO
from the setup menu.
2. Press EXIT to re-
turn.
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
EXIT
17090554
SERIAL NUMBER:
09/15/17
DATE OF MFG:
C
HW VERSION:
02.03.84
FW VERSION:

17 © Agrowtek Inc. | www.agrowtek.com
Display Back Light Timer
GPH MNUH/L
72.0
6.10
1550
600
°F
pH
uS
mV
DWN ENTUP
EXIT
ALARMS
CALIBRATION
SETUP
PUMPS
MENU
DWN ENTUP
BACK
TIME/DATE
UNITS
LOG INTERVAL
SETUP
NEXT
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
The display back light can be programmed to
turn o after a specied time of inactivity from
the last time a button is pressed.
The delay can be set from 1-255 minutes, or set
to 0 to disable the back light timer and keep the
display on continuously.
DWN ENTUP
BACK
COMM
DEVICE ADD
MFG INFO
SETUP
BACKLIGHT
DWN ENTUP
BACK
+1
-1
BACKLIGHT
60 Min
LX1 USB AgrowLINK connects Agrowtek’s devices
to a computer’s USB port for:
Connection to USB AgrowLINK
• Firmware Updates
• Calibration
• Conguration
• Data Logging Download
• Live Graphing
• Email Alerts
• More
Standard FTDI drivers automatically install in Windows. GrowNET protocol available for custom software ap-
plications; sample C# code available. See software manual for more information.
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
© 2016 Agrowtek Inc. | www.agrowtek.com
WiFi
AgrowNET
Link Port
TM
WiFi
Reset
DigiHydro
Water Monitor & Controller
TEMPERATURE CONDUCTIVITY pH O.R.P./ D.O.
(if equipped)
GrowControl
TM
POWER
15-24Vdc
pH
Probe
o.r.p./d.o.
Probe
Temp Probe | EC Probe
red blk wht | clr red blk
LX1 provides power from USB to operate SXH/SXH+
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN www.agrowtek.com
GrowNET
Device/Hub
TM
USB
AgrowLINKTM
LX1 USB to GrowNET™ Bridge
TX
RX
Sensors are available with optional 4-20mA analog outputs. Use the LX3 DinLINK for wire connections. A
mini-din 6 connector is included on units with 4-20mA outputs for power and analog connections. LX3 con-
nects the mini-din 6 cable to a terminal block break-out with terminals for 24V power the four analog chan-
nels. 4-20mA linear outputs correspond to the ranges in the sensor specications table.
Connection to 4-20mA Outputs
24VDC
4-20mA PLC
ANALOG INPUTS
MINI-DIN 6
Analog Cable
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
© 2016 Agrowtek Inc. | www.agrowtek.com
WiFi
AgrowNET
Link Port
TM
WiFi
Reset
DigiHydro
Water Monitor & Controller
TEMPERATURE CONDUCTIVITY pH O.R.P./ D.O.
(if equipped)
GrowControl
TM
POWER
15-24Vdc
pH
Probe
o.r.p./d.o.
Probe
Temp Probe | EC Probe
red blk wht | clr red blk

18 © Agrowtek Inc. | www.agrowtek.com
Connection to MODBUS RTU
Serial Speed & Format
RS-485 / RS-422
Use the LX2 ModLINK to connect MODBUS devices to the GrowNET™ port.
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
© Arowtek Inc. | www.agrowtek.com
GrowNET
Link Port
MODBUS
TM
Digital Water Sensor
Logger & Controller
TEMPERATURE pH
GrowControl
TM
pH
Probe
Temp Probe
red blk wht
GPH MNU
H/L
10.25
pH
72.4
°F
RJ45 CABLE
5 - 24 Vdc
RS-422 RS-485
TX+
TX-
RX-
RX+
TX/RX+
TX/RX-
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
www.agrowtek.com
GrowNET
Device/Hub
TM
ModLINK TM
LX2 MODBUS RTU Bridge
+5-24Vdc GND A B Z Y
Bridge as
shown for
RS-485.
PLC PLC
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
www.agrowtek.com
GrowNET
Device/Hub
TM
ModLINK TM
LX2 MODBUS RTU Bridge
+5-24Vdc GND A B Z Y
Bridge as
shown for
RS-485.
HX8 8-Port Hubs
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
© Agrowtek Inc. | www.agrowtek.com
TM
GrowNET 8-Port Hub
GrowControl
TM
8 7 6 5
POWER
12-24Vdc
GrowNET
Upstream
Port
TM
HX8
HX8 GrowNET ™ Hubs allow multiple GrowNET™ sensors, relays and
dosing pumps to be connected to a single LX1 or LX2 interface. Indi-
vidually buered, full-duplex ports for signal integrity. Hubs can be
daisy chained to form a network of up to 247 devices.
Hubs provide up to 1A of power for operating sensors and some re-
lays directly over the GrowNET cable. A DC jack on the hub provides
24Vdc power to the ports from the included 120V wall power supply.
The default serial data format for the LX2 ModLINK interface is: 19,200 baud, 8-N-1.
Alternate speeds and formats between 9,600 - 115,200 baud may be congured with the free AgrowLINK PC
utility using a LX1 USB AgrowLINK and the cross-over adapter supplied with the LX2 ModLINK.
RJ45 CABLE
5 - 24 Vdc
LX2 ModLINK
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN
www.agrowtek.com
GrowNET
Device/Hub
TM
ModLINK TM
LX2 MODBUS RTU Bridge
+5-24Vdc GND A B Z Y
Bridge as
shown for
RS-485.
Technology to Help You Grow
AGROWtEK
U.S.A.
MADE IN www.agrowtek.com
GrowNET
Device/Hub
TM
USB
AgrowLINKTM
LX1 USB to GrowNET™ Bridge
TX
RX
GrowNET
Cross-Over
Adapter
LX1 USB AgrowLINK
GrowNET™
Cross-Over
Adapter
PC
MODBUS Manual
See MODBUS manual for more information.

19 © Agrowtek Inc. | www.agrowtek.com
Calibration registers are 16-bit signed integers for the purpose of calibrating the sensor values or analog out-
put channels. Calibration may be achieved by writing the desired calibrated value to the associated register.
Writing to the calibration registers automatically invokes the calibration routine for that register.
Oset Calibration
Oset, or zero calibration, is an arithmatic positive or negative correction to the sensor reading. Operations
performed using the oset register are:
-Temperature calibration
-pH 7 calibration
-Conductivity, ORP or DO zero calibration
To perform a sensor oset calibration, simply write the corrected sensor value to the oset calibration reg-
siter (taking into account the integer scale as shown above.)
To set the temperature to a calibrated value of 25°C, write the value“2500.”
To set the pH 7 calibration, write the value “700.”
To set the conductivity zero calibration, write the value“0.”
Span Calibration
Span, or slope calibration, corrects the slop of the sensor reading at a second point, away from the zero cali-
bration. Operations performed using the span register are:
Calibration Registers
Sensor values are available in integer or oating point formats depending on the register requested (see
map.)
Sensor Value Registers
Sensor # Type Integer Scale Range
1 Temperature x100 -2000 - 6000 (-20 - 60°C)
2 pH x100 0 - 1400 (0 - 14.00pH)
3 Conductivity x1 0 - 5000 microSiemens
4 O.R.P. x1 -1000 - +1000 mV
D.O. x100 0 - 4000 (0 - 40.00 mg/L max, per cal)
For example: an integer temperature value of 2417 is equal to a temperature reading of 24.17°C.
0x03 Read Multiple Registers
0x06 Write Single Register
0x10 Write Multiple Register
Supported Commands
All registers are 16 bits wide with addresses using the standard MODICON protocol. Floating point values
use the standard IEEE 32-bit format occupying two contiguous 16 bit registers. ASCII values are stored with
two characters (bytes) per register in hexadecimal format.
Register Types

20 © Agrowtek Inc. | www.agrowtek.com
MODBUS Register Map
Parameter Function Type Scale Access Address
Device Address Slave Address Value, 1-247 8 bit R/W 40001
Baud Rate Comm baud rate Value 16 bit R 40002
Data Format Comm data format Value 16 bit R 40003
Serial# Serial Number ASCII 8 Char R 40004
DOM Date of Manufacture ASCII 8 Char R 40008
HW Version Hardware Version ASCII 8 Char R 40012
FW Version Firmware Version ASCII 8 Char R 40016
Sensor 1 Value Sensor output Signed Int 16 bit R 40101
Sensor 2 Value Sensor output Signed Int 16 bit R 40102
Sensor 3 Value Sensor output Signed Int 16 bit R 40103
Sensor 4 Value Sensor output Signed Int 16 bit R 40104
Sensor 1 Value Sensor output Float 32-bit R 40201
Sensor 2 Value Sensor output Float 32-bit R 40203
Sensor 3 Value Sensor output Float 32-bit R 40205
Sensor 4 Value Sensor output Float 32-bit R 40207
Sensor 1 Oset Cal Calibration Input Signed Int 16 bit W 41101
Sensor 2 Oset Cal Calibration Input Signed Int 16 bit W 41102
Sensor 3 Oset Cal Calibration Input Signed Int 16 bit W 41103
Sensor 4 Oset Cal Calibration Input Signed Int 16 bit W 41104
Sensor 1 Span Cal Calibration Input Signed Int 16 bit W 41201
Sensor 2 Span Cal Calibration Input Signed Int 16 bit W 41202
Sensor 3 Span Cal Calibration Input Signed Int 16 bit W 41203
Sensor 4 Span Cal Calibration Input Signed Int 16 bit W 41204
Sensor 1 Analog Cal Calibration Input Signed Int 16 bit W 41301
Sensor 2 Analog Cal Calibration Input Signed Int 16 bit W 41302
Sensor 3 Analog Cal Calibration Input Signed Int 16 bit W 41303
Sensor 4 Analog Cal Calibration Input Signed Int 16 bit W 41304
-pH 4.01 or 10.0 calibration
-Conductivity, ORP or DO calibration to solution standard
To set the pH 4.01 calibration, write the value “401.”
To set the conductivity to a calibrated value of 1413uS, write the value “1413.”
Note: perform any “oset” calibrations prior span calibrations.
Analog Calibration
Analog output calibration sends a positive or negative oset to the respective output channel’s digital to
analog converter (DAC.) The DAC has a resolution of 0.005mA/bit.
±1 calibration bit = ±0.005mA adjustment
For example: to shift the analog output up by 0.1mA, set the analog oest value to +20. ( 0.1 / 0.005 = 20)