Application
BOILER TEMPERATURE MONITORING/MAPPING
Note 4
Temperature Measurement
General Application Description
Large boilers typically have many thermocouples attached to monitor and map internal
temperatures. The purpose of these measurements is to maintain efficiency and
uniformity of temperature. This is
especially true in multi-story boilers
used in power plants. Typically,
there are hundreds of thermo- BOILER
TEMPERATURE
couple wires bundled and strung T/C INPUTS
through conduit. These large
bundles can sometimes
be hundreds of feet in
16, 32 or 64
length to the control Thermocouple
room. Scanivalve’s Digital Inputs
(Incorporates
Thermocouple Scanner cold junction
described on page 2 and
microprocessor)
eliminates most of this
wiring by placing the
intelligence near the
boiler.
ETHERNET CABLE TO
CONTROL ROOM
Temperature Measurement Solution
The Model DTS3250 Thermocouple Scanner is an intelligent one-box solution
that can eliminate long thermocouple wire bundles. By mounting the DTS
module in the area of the boiler, the thermocouple wires can be kept short,
thus minimizing noise problems. The thermocouple signals are converted into
engineering units of degrees C or F. Data are output via Ethernet TCP/IP.
Therefore, instead of bundles of thermocouples hundreds of feet in length,
there is only a noise immune Ethernet cable going back to the control room or
network.
This represents a large initial savings in thermocuple wire, labor to install
thermocouple wire into conduits, and ease for trouble shooting each channel.
Intelligent Thermocouple Scanner
The Model DTS3250 Temperature Scanner incorporates a microprocessor
and a 22 bit A/D for each thermocouple input. In addition, it has an isothermal
block incorporated for the Uniform Temperature Reference (UTR). Therefore,
no patch panels or external cold junctions are required. This rugged module
accepts 16, 32, or 64 pairs of type E, J, K, N, R, S, T, & B thermocouples. The
DTS3250 uses stored NIST thermocouple conversion tables to convert mV
inputs to engineering units of degrees C or F. Each input channel of the
DTS3250 may be configured for a different T/C type.
Communication
The DTS3250 modules use industry proven Ethernet communications. The
Model DTS3250 thermocouple scanner (16 channel only) incorporates an
embedded web server for EASY communication and setup configuration.
Operation is controlled via a host computer. Direct 24/7 communication can be
made via Telnet, our LabView drivers, or an OPC server.
Scanivalve Headquarters
1722 N. Madson Street
Liberty Lake, WA 99019
Tel: 509-891-9970
800-935-5151
Fax: 509-891-9481
e-mail: scanco@scanivalve.com
www.scanivalve.com
European Technical Office
P.O Box 3317
Bath BA1 7XN, UK
Tel: 01225-852-581
Fax: 01225-852-561
