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ST5700 - Steam Trap Monitor - Theory of Operation
Armstrong Intelligent Monitoring Model ST5700 is wireless monitoring technology that efficiently
monitors and evaluates steam trap operation. The AIM™ ST5700 identifies the conditions of a steam
trap to determine significant problems that could put your operation at risk. The AIM™ ST5700 can
accurately detect potential issues such as plugged and blow-through steam traps, which can cause
a range of issues including, but not limited to failed equipment, loss of product, and safety concerns.
Immediate failure notification from the AIM™ ST5700 helps identify the root cause while minimizing
production losses and reducing energy consumption. Using nonintrusive technology combined with
WirelessHART, the AIM™ ST5700 is the ideal solution for any temporary or permanent 24/7 steam
trap monitoring.
Theory of Operation
The Armstrong ST5700 AIM™ transmitter is designed to continuously monitor any type of steam
trap. It utilizes a combination of hardware and integrated algorithms to accurately detect steam
trap conditions. The hardware consists of an acoustic sensor (Piezo) and a temperature sensor
(Thermistor). The integrated algorithms are patented, proprietary code designed by Armstrong to
provide actual steam trap conditions based on inputs from the hardware. When applied to a steam
trap, the device will display and/or wirelessly transmit the current condition of the steam trap. The
device is mounted onto the inlet pipe of the steam trap (≤ 6”) by an Armstrong designed waveguide
(saddle style pipe clamp).
The ST5700 has built-in algorithms, which perform a series of diagnostic checks in order to determine
the condition of the steam trap.
White
Paper
Ultrasonic and
temperature sensors Waveguide mounting
hardware
The first stage validates the surface temperature of the steam line and compares it with the
configurable set temperature point. The temperature sensor detects the skin temperature at the
inlet of the steam trap and is displayed as the secondary variable (SV). The SV is compared to the
configurable set temperature, which is displayed as the tertiary variable (TV).
If the SV is less than the TV, then the steam trap is cold. This could be due to a failed plugged steam
trap, or there is no steam distributed to the steam trap. If this is the case, the transmitter will return a
primary variable (PV) of 2. A PV of “2” means the steam trap is in a cold condition.
If the SV is greater than the TV, there is steam being distributed to the trap causing the device to go
into the second stage of diagnostics.
In the second stage, the ST5700 listens to the operation of the trap to determine if there is steam loss
through the steam trap’s internal orifice. The Piezo sensor has been tuned to a frequency range of 37
KHz – 43 KHz. Through extensive lab and field testing by Armstrong, this range has been determined
to be the optimal frequency range to detect a trap passing live steam while filtering out background
noise. This acoustic signature is analyzed by Armstrong’s patented algorithm to determine if the
steam trap is in a blow-thru condition (i.e. - losing live steam).
If the algorithm determines that the trap is in normal operation, then the ST5700 will publish a PV of
1. A PV of “1” means the trap is in a good condition.
If the algorithm determines that the trap is losing live steam, the ST5700 will publish a PV of 3. A PV
of “3” means the trap is in a blow-thru condition.
ST5700 - STEAM TRAP MONITOR - THEORY OF OPERATION
Armstrong International
North America • Latin America • India • Europe / Middle East / Africa • China • Pacific Rim
armstronginternational.com
White Paper 1502
Printed in U.S.A. - 3/13
© 2013 Armstrong International, Inc.
ST5700 - STEAM TRAP MONITOR - THEORY OF OPERATION
Wireless Communication
Armstrong’s ST5700 uses WirelessHart for its communication protocol. WirelessHart is a robust
wireless protocol that allows communication amongst other transmitters, while maintaining
compatibility with existing devices, tools, and systems. WirelessHart uses a mesh technology for
developing wireless networks. It allows devices to communicate with each other, repeating the signals
back to the gateway. This network is also self healing; if a device loses its path back to the gateway it
will automatically find the next best route.

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Wireless Steam Trap Monitor: Theory of Operation

  • 1. ST5700 - Steam Trap Monitor - Theory of Operation Armstrong Intelligent Monitoring Model ST5700 is wireless monitoring technology that efficiently monitors and evaluates steam trap operation. The AIM™ ST5700 identifies the conditions of a steam trap to determine significant problems that could put your operation at risk. The AIM™ ST5700 can accurately detect potential issues such as plugged and blow-through steam traps, which can cause a range of issues including, but not limited to failed equipment, loss of product, and safety concerns. Immediate failure notification from the AIM™ ST5700 helps identify the root cause while minimizing production losses and reducing energy consumption. Using nonintrusive technology combined with WirelessHART, the AIM™ ST5700 is the ideal solution for any temporary or permanent 24/7 steam trap monitoring. Theory of Operation The Armstrong ST5700 AIM™ transmitter is designed to continuously monitor any type of steam trap. It utilizes a combination of hardware and integrated algorithms to accurately detect steam trap conditions. The hardware consists of an acoustic sensor (Piezo) and a temperature sensor (Thermistor). The integrated algorithms are patented, proprietary code designed by Armstrong to provide actual steam trap conditions based on inputs from the hardware. When applied to a steam trap, the device will display and/or wirelessly transmit the current condition of the steam trap. The device is mounted onto the inlet pipe of the steam trap (≤ 6”) by an Armstrong designed waveguide (saddle style pipe clamp). The ST5700 has built-in algorithms, which perform a series of diagnostic checks in order to determine the condition of the steam trap. White Paper Ultrasonic and temperature sensors Waveguide mounting hardware
  • 2. The first stage validates the surface temperature of the steam line and compares it with the configurable set temperature point. The temperature sensor detects the skin temperature at the inlet of the steam trap and is displayed as the secondary variable (SV). The SV is compared to the configurable set temperature, which is displayed as the tertiary variable (TV). If the SV is less than the TV, then the steam trap is cold. This could be due to a failed plugged steam trap, or there is no steam distributed to the steam trap. If this is the case, the transmitter will return a primary variable (PV) of 2. A PV of “2” means the steam trap is in a cold condition. If the SV is greater than the TV, there is steam being distributed to the trap causing the device to go into the second stage of diagnostics. In the second stage, the ST5700 listens to the operation of the trap to determine if there is steam loss through the steam trap’s internal orifice. The Piezo sensor has been tuned to a frequency range of 37 KHz – 43 KHz. Through extensive lab and field testing by Armstrong, this range has been determined to be the optimal frequency range to detect a trap passing live steam while filtering out background noise. This acoustic signature is analyzed by Armstrong’s patented algorithm to determine if the steam trap is in a blow-thru condition (i.e. - losing live steam). If the algorithm determines that the trap is in normal operation, then the ST5700 will publish a PV of 1. A PV of “1” means the trap is in a good condition. If the algorithm determines that the trap is losing live steam, the ST5700 will publish a PV of 3. A PV of “3” means the trap is in a blow-thru condition. ST5700 - STEAM TRAP MONITOR - THEORY OF OPERATION
  • 3. Armstrong International North America • Latin America • India • Europe / Middle East / Africa • China • Pacific Rim armstronginternational.com White Paper 1502 Printed in U.S.A. - 3/13 © 2013 Armstrong International, Inc. ST5700 - STEAM TRAP MONITOR - THEORY OF OPERATION Wireless Communication Armstrong’s ST5700 uses WirelessHart for its communication protocol. WirelessHart is a robust wireless protocol that allows communication amongst other transmitters, while maintaining compatibility with existing devices, tools, and systems. WirelessHart uses a mesh technology for developing wireless networks. It allows devices to communicate with each other, repeating the signals back to the gateway. This network is also self healing; if a device loses its path back to the gateway it will automatically find the next best route.