On-line TOC, BORON Analyzers

500 Series Online TOC Analyzers

500 RL On-Line TOC Analyzer


The Sievers 500 RL Analyzer is simply the most robust and easy to implement on-line TOC analyzer available.


TOC Analyzer Reliability – It simply measures TOC…nothing else!

The 500 RL TOC Analyzer combines an innovative design with the proven and trusted Sievers membrane TOC technology to ensure maximum uptime and reliability. While most on-line TOC technologies are limited to only ultra-low conductivity water, the 500 RL’s unique technology allows it to meaure TOC in water up to 25 uS/cm.

We invite you to learn more about the Sievers membrane TOC technology by watching this animation.

Conductivity Measurement

The 500 RL Analyzer is not only the most robust and easy to implement TOC analyzer available, but is also a fully compliant on-line conductivity instrument. Raw conductivity and temperature data are available to support global regulatory requirements. The instrument even includes built-in USP/EP/JP conductivity “look-up” charts for Stage 1 testing. The 500 RL constantly verifies compliance and can immediately notify an operator via alarm or Modbus TCP/IP outputs.

Easy to Use and Access Data

For several decades, the Sievers brand of TOC analyzers have been reliable and extremely easy to use. The 500 RL Analyzer is very user-friendly due to its automated calibration and suitability protocols. In addition, the 500 RL has a color touch-screen display that makes it easy to configure instrument parameters and view data in tabular or graphical form. The interface also provides real-time status of consumables, with prompts when semi-annual maintenance is due.

Innovative On-line Sampling System

The patented Sievers One-port Integrated On-line Sampling System (iOS System) and innovative four-port Super iOS System fully automates all system protocols and can also analyze a quick grab sample for trouble shooting a specific port on your water system.

Total Organic Carbon*

Linear Range 0.03 to 2,500 ppb as C
Precision < 1% RSD or 0.03 ppb as C, whichever is greater
Accuracy ± 5% of measurement
pH Range 5.5 to 8.0 in order to meet accuracy specification
Analysis Modes On-line, on-line averaged, on-line timed
Analysis Time Continuous mode: 6 minutes
Average and timed modes: 0.5, 1, 4, 8, or 24 hours
Ozone Compatibility** Maximum 200 ppb as O3
External Flow Rate Minimum 50 mL/min
Sample Temperature 1–95 °C (34–203 °F)
Sample Pressure Up to 100 psig
Interferences Insensitive to organic heteroatoms
Calibration Stability Typically 12 months
Display Readout 3 significant digits


Raw Conductivity Range*** 0.01 to 35 µS/cm
Conductivity Accuracy**** ± 0.005 µS/cm or ± 1%, whichever is greater
Conductivity Precision <0.25% RSD
Maximum Sample Conductivity 25 µS/cm at neutral pH


Power Universal Power Supply: 100–240 ± 10% VAC, 50 W, 50/60 Hz
Ambient Temperature 10–40°C (50–104°F)
Maximum Relative Humidity Up to 95%, noncondensing
Maximum Altitute 2,300 m (7,546 ft)
Inputs One isolated binary input
Outputs Three isolated 20mA outputs, one Serial RS-232 output, one USB port, one parallel printer port, and four alarm outputs
Installation/Overvoltage Category II (protects against transients present in Category II power)
Safety Certifications

ETL, CE see Declaration of Conformity (base)
           see Declaration of Conformity (Super iOS)

Pollution Degree 2 (normally only non-conductive pollution)
Display Backlit Quarter-VGA touchscreen display
Dimensions H: 41.9 cm (16.5 in); W: 48.3 cm (19 in); D: 27.4 cm (10.8 in)
Weight 16.9 kg (37.2 lb)
IP Rating Environmental Enclosure:  IP-45


* Stated analytical performance is achievable under controlled laboratory conditions that minimize operator and standards errors.
** The sample temperature and pressure should not simultaneously exceed 60 °C and 100 psi. 
*** Ozone: 50 ppb continuous, conductivity accuracy ±0.02 µS/cm < 1.0 µS/cm, ±2% >1.0 µS/cm; 200 for 2 hours once/day, conductivity readings not within spec, recovery time to in-spec readings: 2 hours
**** With optional USP <645> conductivity measurement

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