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Article No.: ADG31
Articlename: AZURA pH 2.1S

pH monitor

Main unit for pH monitoring

The AZURA pH 2.1S is a reliable pH monitor which is usually utilized in FPLC to follow buffer composition and elution conditions.

Please combine an external flow cell according to the systems tubing and flow rate. There are two flow cells availbe for flowrates between 0 - 100 ml/min or 100 ml/min - 1000 ml/min. The flow cell needs to be ordered separately.


Technical Data

Flow cell

Flow cell type External pH flow cell
Biocompatible Yes
Connection of flow cell 1/4-28 UNF or 5/16-24 UNF dependent on flow cell
Capillary connection 1/16'', 1/8'' and 3/16'' dependent on flow cell
Wetted materials PEEK


Detector type pH monitor
Measurement accuracy ± 0.5 pH (within 4 - 25°C)
Measurement precision ± 0.2 pH (within 4 - 25 °C)
Measurement range 2 - 12
Maximum data rate 5 Hz
Supported electrodes All pH electrodes with BNC connector and a voltage output of maximal ± 500 mV


Digital outputs LAN; RS-232

Technical parameters

GLP Electronic serial number
Display LCD, 2 x 8 characters
Ambient conditions Operating temperature: 4 – 40°C, 39,2 – 104 °F
Relative humidity: below 90 %, non condensing


Power supply 100 - 240 V, 50 - 60 Hz, max. 20 W
Dimensions 1121 x 129 x 187 mm (W x H x D)
Weight 3 kg

Documents and more information

Certified Quality 

KNAUER is known for the quality of its products and has been certified several times. We produce high-tech laboratory instruments for research, routine analysis and production.
See all Quality certificates

In addition, we have extended documentation about all our products, including CE Declarations of Conformity.
See all CE Declarations of conformity

Innovation and quality - since 1962. Made in Germany.

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Technical data or prices are subject to change without notice. Prices may vary by country and do not include taxes, customs duties or delivery. All trademarks are the property of their respective owners.Our general terms and conditions apply: www.knauer.net/terms

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