Safety and Productivity Solutions
Honeywell Pressure Switches:
Smart Diagnostic Technology
Technical Note
Smart Switching. Smart System. Smart Choice.
Brake system controllers, CAN hubs, on-board diagnostics, and
advancing intelligent vehicle technologies. Transportation and industrial
controller development is constantly driving ahead with advanced system
architecture to improve value, efficiency, and safety. When a system
encounters a fault, it’s key to know how and where an issue originated
as soon as it occurs. Doing this allows immediate and specific action
to be taken to reduce machine down-time and maintenance cost. Fault
detection and localized diagnostics of subsystem components is a vital
part of the equation to achieve reliable system interaction. Enabling
pressure switch sensors with an intelligent topology is a key part of the
solution to resolving system failures, and allowing immediate awareness
within the control system.
Linking with Advanced Mobile-Hydraulic Controllers
Honeywell pressure switches with Smart Diagnostic Technology are
enabling interaction with advanced mobile-hydraulic systems by
integrating continuity fault diagnostic circuitry in the form of a resistor
topology within the pressure switch. The Smart Diagnostic Technology
solution allows a controller to receive and interpret up to four segregated
signal amplitudes to perform pressure switch diagnostics and status:
open-switch, closed-switch, short-circuit, and open-circuit.
In Figure 2, the failure modes shown are common problems with electrical
contact and interfacing issues within a system subjected to real world
application. Open circuits, cut wires, worn insulation, electrical shorting,
and the list goes on. If a failure sneaks into your system, Honeywell
pressure switches with Smart Diagnostic Technology won’t let it go
undetected.
Figure 1. Honeywell Smart Pressure
Switch Electrical Topology.
R160Ω
R150Ω
Pin 2Pin 1
With an initial offering options for 150, 510,
and 3k Ohms. Our configurable circuits can
be custom tailored to system specific needs.
Smart Diagnostic Technology is available across
Honeywell’s low, medium, and high pressure
switch lines, encompassing the portfolio of HP,
HE, ME, LE, and LP Series pressure switches.
Figure 2. Smart Diagnostic Technology (SDT): Failure Detection and Nominal Function
FAILURE DETECTION
Mobile-hydraulic
controller
Mobile-hydraulic
controller
Pressure switch
with SDT
essure sw
OPEN CIRCUIT
Pressure switch
with SDT
SHORT CIRCUIT
controller
e
ss
u
r
e
sw
itch
with SDT
SHORT
SH
OR
T
NOMINAL FUNCTION
Mobile-hydraulic
controller
Pressure switch
with SDT
Controller Monitor
Levels
Controller/Smart Switch
Signal Interaction
• Closed-Circuit Fault • Open-Operational
• Closed-Operational
• Open-Circuit Fault
For more information
To learn more about Honeywell’s
sensing and switching products,
call 1.800.537.6945 , visit sensing.honeywell.com,
or e-mail inquiries to info.sc@honeywell.com
Honeywell Safety and Productivity Solutions
9680 Old Bailes Road
Fort Mill, SC 29707
www.honeywell.com
006188-1-EN | 1 | 10/16
© 2016 Honeywell International Inc.
Honeywell Pressure Switches: Smart Diagnostic Technology
Technical Note
Warranty/Remedy
Honeywell warrants goods of its manufacture as being free
of defective materials and faulty workmanship. Honeywell’s
standard product warranty applies unless agreed to otherwise
by Honeywell in writing; please refer to your order acknowl-
edgement or consult your local sales office for specific war-
ranty details. If warranted goods are returned to Honeywell
during the period of coverage, Honeywell will repair or replace,
at its option, without charge those items that Honeywell, in its
sole discretion, finds defective. The foregoing is buyer’s sole
remedy and is in lieu of all other warranties, expressed or
implied, including those of merchantability and fitness for
a particular purpose. In no event shall Honeywell be liable
for consequential, special, or indirect damages.
While Honeywell may provide application assistance person-
ally, through our literature and the Honeywell web site, it is
customer’s sole responsibility to determine the suitability of
the product in the application.
Specifications may change without notice. The information
we supply is believed to be accurate and reliable as of this
printing. However, Honeywell assumes no responsibility for its
use.
mWARNING
IMPROPER INSTALLATION
• Consult with local safety agencies and their
requirements when designing a machine control link,
interface and all control elements that affect safety.
• Strictly adhere to all installation instructions.
Failure to comply with these instructions could result
in death or serious injury.