Veolia Water Technologies & Solutions

Sievers CheckPoint Portable / On-Line TOC Sensor

Portable, light weight TOC sensor for microelectronics and pharmaceutical applications

The Sievers CheckPoint On-Line/Portable Total Organic Carbon (TOC) Sensor allows superior flexibility when measuring low level TOC. It can be used on-line for continuous monitoring or carried to any point in a water system. This sensor is a powerful tool for rapid diagnostic sampling and troubleshooting for microelectronics, pharmaceutical and power applications. 

The CheckPoint TOC Sensor is available in two models - CheckPoint Pharma and the CheckPointe to better serve pharmaceutical and ultrapure water applications.

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Learn more about the online and portable capabilities of the Sievers CheckPoint

The Sievers CheckPoint Sensor’s light weight and portability makes rapid detection of upsets fast and simple.

Features and Benefits

Checkpoint Features and Benefits

TOC monitoring versatility and convenience  

  • Rapid analysis  
  • Easy to use with low maintenance  
  • IQ/OQ/PQ validation protocols provided  
  • CheckPoint Pharma has a range of 0.21 to 1,000 ppb and CheckPointe has a range of 0.05 to 1,000 ppb
  • On-line or grab sample modes  
  • CheckPoint Pharma meets United States Pharmacopeia (USP), European Pharmacopeia (EP), Chinese Pharmacopeia (CP), and Indian Pharmacopeia (IP) requirements


Checkpoint Specifications

Total Organic Carbon1

Linear Range (CheckPoint Pharma) 0.21 ppb to 1,000 ppb C
Linear Range (CheckPointe) 0.05 ppb to 1,000 ppb C
Instrument Accuracy2 ± 5% when measuring 500 ppb C of sucrose2,3
Precision (CheckPoint Pharma) The greater of < 1% RSD or 0.21 ppb for on-line measurements, 3.0% RSD at 500 ppb for grab samples
Precision (CheckPointe) The greater of < 1% RSD or 0.05 ppb for on-line measurements, 3.0% RSD at 500 ppb for grab samples
Analysis Modes On-line (average or timed); grab (with optional Vial Sampling Kit)
Analysis Time Selectable: 15 seconds to 8 hours on-line mode; 10 minutes grab mode
Ozone Compatibility (CheckPoint Pharma only) 50 ppb O3; 200 ppb O3 for 2 hours daily


Conductivity/Resistivity Range for TOC Max 1.4 μS/cm or Min 0.7 Mohm-cm from CO24
Conductivity/Resistivity Precision ± 0.5% RSD (20-40 °C or 68-104 °F)
Conductivity/Resistivity Accuracy ± 2.0%

Sensor Specifications

On-Line Sample Pressure 103–690 kPa (15–100 psig) (1.0–6.9 bar)
Low Pressure Samples -6.9–55 kPa (-1.0–8 psig) (-0.069–0.55 bar) with optional Low Pressure Sampling Kit
Required Sample Line Flow Rate 60 mL/min (high pressure) or 1 mL/min (low pressure)
Power Requirements 100-240 ± 10% VAC, 60 W, 50/60 Hz
Temperature (CheckPoint Pharma) Sample: 10-90 °C (50-194 °F); Ambient: 10-55 °C (50-131 °F)3
Temperature (CheckPointe) Sample: 10-60 °C (50-140 °F); Ambient: 10-40 °C (50-104 °F)
Humidity 90%
Altitude 3000 meters
Outputs Ethernet (Modbus TCP/IP), USB, plus two 4-20 mA, two alarms, and binary input with optional I/O board
Installation/Overvoltage Category II
Dimensions H: 25.40 cm (10.0 in); W: 30.48 cm (12.0 in); D: 15.24 cm (6 in)
Dimensions with Vial Sampling Kit H: 25.40 cm (10.0 in); W: 34.87 cm (13.7 in); D: 15.24 cm (6 in)
Weight — CheckPoint 2.9 kg (6.4 lb)
Weight — Vial Sampling Kit 0.6 kg (1.3 lb) 
Industrial Ratings and Safety Certifications CE, ETL listed. Conforms to UL Std. 61010-1. Certified to CSA C22.2 No. 61010-1. see Declaration of Conformity

The UV lamp inside this product contains mercury and must be recycled or disposed of in accordance with local, state, and federal laws.

Stated analytical performance is achievable under controlled laboratory conditions that minimize operator and standards errors.
Total measurement accuracy includes separate contributions from both the standards accuracy and the Instrument Accurac
Conductivity and accuracy specifications are met as shown above for ambient temperatures from 10–40 °C (50–104 °F). When calibrated at 40 °C, the following specifications are met at 40–55 °C (104–131 °F): conductivity accuracy is } 2.4%, and TOC accuracy is } 6.7% on 500 ppb C of sucrose.
Sample water quality with a conductivity >1.4 μS/cm may result in reduced TOC accuracy.


Checkpoint Options and Accessories

  • I/O Board: provides two analog outputs (TOC or Conductivity/Resistivity, Standby and Error), one binary input (remote start/stop), two alarms and 24 V supply

  • Vial Sampling Kit: enables users to measure standards and grab samples

  • Sampler Inlet Filter: 60 µm sample inlet filter is recommended for on-line monitoring

  • Low-Pressure Sampling Kit: this includes Teflon and stainless-steel sampling tubes and a waste bag for collecting zero-pressure samples in the laboratory or fab

  • Printers Compatible with CheckPoint and CheckPointSensors: Veolia recommends using one of the following point-of-sale (POS) printers: Bixolon SRP-275, Citizen CD S500A, or Star Micronics SP-500.