Product Details

AquaSensors AquaChlor™ Free Chlorine DataStick System


Product Features


DataStick provides universal conversion of sensor signals and interactive communications for measurement, calibration, configuration and diagnostics

:: Amperometric measurement

:: Temperature compensated

:: Pre-calibrated

:: Plug & play

:: Rugged Teflon® membrane

:: Replaceable membrane cap

:: Remote measurement, calibration, configuration, and diagnostics

:: Turnkey AquaChlor monitoring system




Product Specification



Range: 0 to 5 ppm and 0 to 20 ppm

System Performance

Resolution: 0.005 ppm


Accuracy: 2% or ±10 ppb (whichever is greater)
Step Response Time: 90% in 90 seconds

Operational Environment

Temperature Range: 0 °C to 45 °C
(32 °F to 113 °F)
Maximum Pressure: 15 psig @ 45 °C
System Flow Rate in Chamber:
200 to 250 mL/min

Free Chlorine

When chlorine and pH DataSticks are connected to
the AV38 local display, HOCl and ClO¯ dissociation
curves are pH compensated and used to calculate
free chlorine present. A stable pH value can also be
entered manually.


Voltage Range: 10 to 30 VDC
Maximum Power: 200 mW
Typical Power: 120 mW


Process Electrodes: Gold cathode, silver anode
Membrane: Teflon®
O-rings: Viton®
Sensor Head Material: Noryl®
DataStick Material: PEEK or CPVC
Weight: 1.2 lbs

Units of Measure

Measurement units: ppm, free chlorine
Temperature Units: °C, °F


Sample: 1 point
Zero: 1 point
Temperature: point


Immunity & Emissions: CE Certified 89/336/EEC:
CISPER 11, EN61000 (-4-2,-4-3,-4-4,-4-6, 4-8)
Safety: cULus Listed; 367G E303570
Hazardous Locations: Haz Loc Class 1,
Division 2, Groups A, B, C, D. T5 Max
Ambient 50 °C



Drinking water, Food & beverage: Monitoring of sanitized process water: Monitoring of sterilization of glassware, Reverse osmosis/ultrapure water


Ordering Information (AquaChlor™ Free Chlorine DataStick System)


Part No.



AquaChlor System

Display Location (d)

1 = Integral
2 = Remote

AV38 Configuration (y)

A = 1 current output; 24 VDC power
B = 2 current, 2 relays; 24 VDC Power
B = 2 current, 2 relays; 100 to 240 VAC Power

AV38 Host
Communications (y)

0 = None
4 = Modbus RTU
5 = Device Net
6 = CANopen
7 = Ethernet IP, Modbus TCP, TCP/IP

pH Compensation (z)

A = Manual
B = Automatic (w/pH DataStick)

Note: Consult for additional configurations and accessories


Order Information (Free Chlorine DataStick )


Part No.



Free Chlorine Sensor Head

Sensor Tip (t)

B = Process Flat
C = Face Seal (for flow chamber mounting

Measurement range (r)

1 = 0 to 5 ppm
2 = 0 to 20 ppm



Body Material (b)

1 = 316 SS
2 = CPVC
3 = PEEK

Mounting (t)

1 = NPT


Communications Adapter

Body Material (b)

2 = CPVC
3 = PEEK

Communications (nw)

1A = RS232 ASCII  3B = DF1 RS485
1B = RS485 ASCII  7R = Ethernet
2B = Modbus® RTU 5R = DeviceNet
2A = Modbus RS232 6R = Profibus DP
3A = DF1 RS232 8R = USB

Cable Length (x)

1 = 10 feet
2 = 20 feet
3 = 30 feet

Cable Termination (y)

A = Stripped Wires

Note: Consult for additional configurations and accessories


Thermo Scientific AV38 DataStick Local Monitor and Controller


Features & Benefits


:: Connects to any DataStick system

:: Convenient ¼ DIN enclosure

:: Display sensor and temperature data

:: Menu functions: Calibration, configuration and diagnostics, Digital protocol options for remote measurement, calibration, configuration and diagnostics

:: Two 4 to 20 mA current outputs

:: Two Form C relays for alarm, control and wash

:: PID controller for use with pH and conductivity

:: 7 conduit knockouts for easy cabling




Product Specification


Mounting Options

Wall-mount Enclosure: NEMA 4X
Panel-mount: ¼ or ½ DIN NEMA
4X panel mount available
Display Only: with NEMA 4X gasket

User Interface

Display: 2 line by 16 character LCD
Backlight: High contrast green
Keypad: 4 directional arrows, MENU,

Environmental Conditions

Ambient Operating Temperature Range:
–20 to 65 °C
Maximum Relative Humidity:
95% non-condensing

DataStick Sensor Connections

Supports 1 to 255 Modbus® RTU DataStick Sensors of any type
Supported Sensors: pH, ORP, two electrode conductivity, two electrode resistivity, toroidal
conductivity, dissolved oxygen (ppm and ppb) dissolved ozone, drinking water and wide-range turbidity, suspended
solids and free chlorine

4 to 20 Milliamp Current Output Options

Assignable parameters
PID function when pH or conductivity parameter selected Loop power provided by AV38


Two 1 amp Form C relays with NO and NC contacts
Assignable parameters
Configured for alarm, control and timer functions


Options to Host Computer Network: MODBUS RTU, DeviceNet, Modbus RS232, RS232 ASCII, CANopen, Ethernet IP, Modbus TCP, TCP/IP
Others: Consult factory

Power Supply

Input: 10 to 30 VDC or 100 to 240 VAC
Power: 2W at 25°C


Meets CE requirements for heavy

Note: Consult for additional configurations and accessories


Download Brochure

Free Chlorine DataStick System
AV38 Datastick Local Monitor And Controller

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