DR4900 Laboratory Spectrophotometer
The new benchtop spectrophotometer that succeeds the DR3900, with a 10-inch screen and built-in test diagnostics.
- New
- DR3900 successor
- 10"
- touchscreen
- Auto
- test diagnostics
Parameter
Chlorine Analysers & Chlorine Test Equipment
Chlorine residual proves that disinfection is working through the network. Free chlorine is the active disinfectant; total chlorine adds combined forms such as chloramines.
LimitSANS 241: free chlorine ≤ 5 mg/L (chronic health). Most utilities target a residual well below this.
Measurement options
Laboratory, portable and online Free & Total Chlorine measurement
Laboratory
Spectrophotometric DPD methods for free and total chlorine, used to verify online analysers and field kits.
Portable & field
Pocket colorimeters and portable spectrophotometers using DPD reagents for network and reservoir checks.
Online & process
Colorimetric DPD analysers for compliance-grade monitoring, and reagent-free amperometric sensors for dosing control.
- Blue Drop Distribution Monitoring Panel HACH
- CL17sc Colorimetric Chlorine Analyser HACH
- SC4500 Controller HACH
- THREADbridge Wireless Sensor Network Kreon Technology
- AiR Advance IoT Router AiR (Advance IoT Router)
Products
Products for Free & Total Chlorine
DR3900 Laboratory Spectrophotometer
Proven benchtop VIS spectrophotometer with over 220 pre-programmed methods. Being replaced by the DR4900.
- 320–1 100
- nm range
- 220+
- methods
- Auto
- data logging
DR1900 Portable Spectrophotometer
Rugged portable spectrophotometer with over 220 of the most commonly used water methods.
- 220+
- methods
- 340–800
- nm range
- IP67
- field-rated
DR900 Handheld Colorimeter
Rugged multi-parameter handheld colorimeter with over 90 methods: measure in less than four clicks.
- 90+
- methods
- 500
- results stored
- USB
- data transfer
DR300 Pocket Colorimeter
Compact, waterproof free and total chlorine colorimeter, trusted by water professionals for almost two decades.
- 0.02–8.0
- mg/L Cl₂
- Free + total
- chlorine
- IP67
- waterproof
TitraLab AT1000 Automatic Titrator
Automatic titration with pre-set applications: accurate, repeatable results without complex programming.
- Auto
- end point
- Pre-set
- methods
- 4
- industries
Advanced Drinking Water Laboratory
Rugged, easy-to-use portable laboratory for on-site drinking-water results.
- Complete
- field lab
- On-site
- results
- Carry
- case
Blue Drop Distribution Monitoring Panel
Pre-engineered drinking-water distribution panel: pH, conductivity, turbidity, chlorine, pressure and temperature on one SC4500.
- 6
- measurements
- 1
- controller
- Live
- dashboard option
CL17sc Colorimetric Chlorine Analyser
Online DPD analyser for free or total chlorine in drinking water.
- DPD
- method
- 0–5
- mg/L Cl₂
- Free/total
- models
SC4500 Controller
Universal controller for HACH digital and analogue sensors: the hub of Blue Drop and Green Drop panels.
- mA
- outputs
- Digital
- protocols
- Remote
- access
THREADbridge Wireless Sensor Network
Secure wireless network for wired devices: retrofit existing sensors and send their data to the cloud.
- 250
- radios
- ~500 m
- range
- < 0.3 W
- power
AiR Advance IoT Router
Out-of-the-box IoT data acquisition: connect instrument outputs and send data securely to the cloud.
- Out-of-box
- set-up
- Cloud
- dashboard
- Remote
- sites
Common questions
Should I use a DPD analyser or an amperometric sensor online?
DPD analysers are the reference method and suit compliance monitoring but consume reagents. Amperometric sensors respond quickly and suit dosing control, but need stable pH and flow and regular verification.
What is the difference between free and total chlorine?
Free chlorine is hypochlorous acid and hypochlorite. Total chlorine is free chlorine plus combined chlorine, mainly chloramines. Combined chlorine is total minus free.
Need to measure Free & Total Chlorine?
Tell us your sample type, range and whether you need lab, portable or online measurement. We will recommend the right option.