• Large, 4 digit LED displays temperature and dissolved oxygen for up to four sample points
  
  
• Four manual ranges: 0-20 ppb, 0-200 ppb, 0-2 ppm, 0-20 ppm and auto-ranging
  
  
• Manual and Automatic digital calibration
  
  
• Four 4-20 mA analog and one RS232 digital output
  
  
• Four alarm set points and password protection
  
  
• Easy to install, calibrate, and maintain
  
  
• 5 year warranty on analyzer

... for accurate, continuous, in situ monitoring of up to four ultrapure water dissolved oxygen measurements

The Martek Mark 25 Ultrapure Water Dissolved Oxygen Analyzer is a highly accurate, simple-to-use monitoring system that provides continuous monitoring of up to four ultrapure water sample points to the low parts-per-billion (ppb) level at an affordable price.

Designed to provide maximum performance and value, the Mark 25's ability to monitor up to four sample points along with a full complement of output capabilities allows the operator to customize the system to any application. A large, bright 4 digit LED display presents data and setup options quickly while DB-9 connectors and removable terminal strips allow for quick sensor, recorder, and alarm hookups. There's even an ON/OFF switch located on the rear panel.

Installation, calibration, and sensor maintenance are easy and require a minimum of experience. Housed in a standard 1/4 DIN enclosure, the Mark 25 easily replaces inoperative or obsolete equipment without modification to existing sample panels. And, with a five year warranty, the Mark 25 is designed for years of worry-free service.

The Mark 25 is ideal for all high purity processes in nuclear and high-performance fossil fuel power plants; condensate polishing systems and demineralizers; semiconductor and pharmaceutical manufacturing plants; and other industrial applications.