DirectLine DL425 ppb Transmitter

DirectLine DL425 ppb Transmitter

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Honeywell’s DirectLine DL425 ppb Transmitter is used to measure dissolved oxygen. Its compact design combines advanced microelectronics and Honeywell’s unique sensing technologies, for use in a wide range of applications including boiler feedwater in power plants. ​

​The DL425 ppb Transmitter measures dissolved oxygen accurately in applications where low levels of dissolved oxygen are present. Intrinsically safe, its corrosion-resistant sealed composite enclosure protects it from harsh industrial environments. The remote mounting option connects the electronics module to the DO probe via a cable for submersion or special mounting applications.

Its plug-in modular design allows safe removal and easy replacement of the probe. A ½-inch NPT conduit connection increases protection and noise immunity of the output cable. The transmitter module can be mounted integrally or remotely with the DL5000 probe on a 2-inch pipe, wall or DIN rail.

Apart from air and sample calibration options that reduce calibration time, the device includes a playing card-sized guide for simple, correct and consistent calibration and configuration. 

​The DL425 ppb transmitter consists of an electronics transmitter module and a sensor that can be mounted integral to the transmitter or remotely eliminating the need and additional cost of a separate analyzer or transmitter.

For fast reliable probe accuracy check, the probe must first be removed from the process and exposed to air. The soft keys on the transmitter’s front case can then be used to initiate the air calibration procedure. The LCD display provides local process ppb O2 readouts for quick processing, while electronics and probe diagnostics reduce troubleshooting times. 

​Honeywell’s DirectLine DL425 ppb Transmitter enables accurate measurement of low levels of dissolved oxygen in boiler feedwater in power plants to minimize corrosion of piping and turbines. It simplifies installation design and minimizes cable and panel construction costs. The transmitter’s direct 4-20 mA output makes it easy to set up, operate and maintain, providing considerable savings over the device’s lifetime. 

9 Documents FoundItems per page :
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DirectLine Sensor Module, 51-52-16-71-Issue 24DirectLine Sensor Module, 51-52-16-71-Issue 2450.86 KBModel Selection Guide1 Jan 2015
Smart Sensors and Analytical Instruments BrochureAnalytical brochure - measurements for pH, ORP, conductivity/resistivity, dissolved oxygen and hydrogen purity.1.55 MBBrochure22 Apr 2014
Field Products Brochure for Power IndustryHoneywell offers a complete range of innovative products to meet application requirements in the power and energy markets.4.28 MBBrochure5 Nov 2013
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
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
DL424/425 DirectLine Sensor Module Specification, 70-82-03-48DL424/425 DirectLine Sensor Module for DL5000 Dissolved Oxygen Probes340.58 KBTech Spec1 Jan 2003
DL424/425 DirectLine Sensor Module Russian Specification, 70-82-03-48-RUDL424/425 DirectLine Sensor Module for DL5000 Dissolved Oxygen Probes405.44 KBTech Spec1 Jan 2003
Public Support Documentation
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DirectLine® DL424/425 Sensor Module for DL 5000 Dissolved Oxygen Probes User Manual 372.57 KBSupport Manual6 Feb 2018
DL424_EU DeclarationEuropean Union Declaration of Conformity308.86 KBSupport Document10 Aug 2016
Hazardous Substance Disclosure. UDA2182, Direct Line 42x, APT2000/4000 China RoHS Disclosure. Hazardous Substance Disclosure Table. Analyzers, Transmitters: English/Chinese443.11 KBSupport Document24 Jun 2016

​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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