DL421 pH Transmitter
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Part of Honeywell’s product range for pH measurement, the DirectLine® DL421 pH Transmitter Sensor combines the latest in microelectronics technology with the proven performance of Honeywell’s sensing technologies, in a unique modular design, for accurate pH monitoring and control.​​

DirectLine DL421 pH Transmitter modules are next-generation analytical transmitters that easily interface with Honeywell’s packaged solutions for accurate pH measurement.

The pH transmitter eliminates pre-amps in pH applications and is connected directly to a Durafet II, Durafet III, DL2000 glass or HPW7000 pH electrodes. This makes the pH transmitter highly cost effective as it is easy to install, start-up, operate and maintain.

Designed to be intrinsically safe, this analytical transmitter’s corrosion-resistant sealed plastic enclosure makes it ideal for harsh environments where moisture, dust and chemicals may be prevalent. A remote mounting option for submersion or special mounting applications connects the electronics module to the pH electrode via a cable. The module can be mounted on a 2-inch pipe, wall or DIN rail.​

The DirectLine DL421 pH monitoring and control system provides unequaled savings during installation, startup, operation and maintenance.

This pH monitoring and control system comprises an electronics transmitter module directly connected to an electrode which can be mounted integrally to the analytical transmitter or remotely, eliminating the need and added cost of a separate analyzer or pH transmitter.

An LCD display gives local readout of process pH that is also re-transmitted through the 4-20 mA loop powered cable. A simple three button interface makes set-up and configuration fast and easy.​

Honeywell’s DirectLine DL421 pH Transmitter offers accurate and cost-effective analytical measurement of pH, resulting in efficient control of process systems. In addition, remote or direct connectivity makes this pH monitoring and control system easy to fit into the process environment. ​

Documentation
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DirectLine DL2000 Electrode Mountings, 51-52-16-76-Issue 15DirectLine DL2000 Electrode Mountings, 51-52-16-76-Issue 1519.41 KBModel Selection Guide1 Jan 2015
DirectLine Sensor Module, 51-52-16-71DirectLine Sensor Module, 51-52-16-7150.85 KBModel Selection Guide7 May 2014
Smart Sensors and Analytical Instruments BrochureAnalytical brochure - measurements for pH, ORP, conductivity/resistivity, dissolved oxygen and hydrogen purity.1.55 MBBrochure22 Apr 2014
DirectLine Sensor Module, 51-52-16-71DirectLine Sensor Module, 51-52-16-7153.54 KBModel Selection Guide29 Oct 2013
Field and process instrumentation and controller solutions for the pulp and paper industry brochure Learn how Honeywell's transmitters, flow meters, controllers and analytical instrumentation solve problems for the pulp, paper and printing industry.3.45 MBBrochure10 Jun 2012
MSG - DirectLine Sensor Module Model Selection Guide - 51-52-16-71 31.92 KBTech Spec13 Mar 2012
Improving Power Plant Efficiency and Extending Equipment Life Brochure on how analytical instruments can improve power plant efficiency.1.04 MBBrochure30 Sep 2011
Remote Analytical Measurements Use wireless networking to gather remote analytical measurements 454.88 KBSolution Note6 Feb 2008
DL421/422 DirectLine Sensor specification, 70-82-03-40DL421/422 DirectLine Sensor for Durafet II and Meredian II pH/ORP Electrodes282.35 KBTech Spec1 Jan 2003
DL421/422 DirectLine Sensor Russian version, 70-82-03-40-RUDL421/422 DirectLine Sensor For Durafet II and Meredian II pH/ORP Electrodes, Russian version390.41 KBTech Spec1 Jan 2003
Public Support Documentation
2 Documents FoundItems per page :
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DL421_DL422_EU DeclarationEuropean Union Declaration of Conformity308.05 KBSupport Document10 Aug 2016
DirectLine DL421 Sensor Module Product manual, 70-82-25-102Product manual on DirectLine DL421 Sensor Module for Durafet II, Durafet III, Meredian II, and HPW7000 pH Electrode708 KBSupport Manual1 Feb 2004

​Training, maintenance and support are critical aspects to consider when choosing a technology partner. Honeywell offers world-class training through our Automation College, as well as comprehensive maintenance and support services designed to leverage your physical and intellectual assets and help you sustain and increase their value and performance over time.

 
 
 
 
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