YOKOGAWA TC User manual

User’s
Manual
1. PREFACE
Thank you for purchasing our temperature sensor.
This User’s Manual gives instructions on handling,
wiring, and maintenance of temperature sensors.
In order for the temperature sensor to be fully functional
and to operate in an efcient manner, the manual must
be carefully read.
■NotesontheUser’sManual
• In no case does this manual guarantee the
merchantability of the transmitter or its adaptability to
a specic client need.
• Changes to specications, structure, and
components used may not lead to the revision of this
manual unless such changes affect the function and
performance of the products.
■Warranty
• The warranty period of the instrument is written
on the estimate sheet that is included with your
purchase.
Any trouble arising during the warranty period shall
be repaired free of charge.
• Whether or not the defective instrument is repaired
free of charge depends on the result of our
inspection.
●Thefollowingconditionsshallnotbeeligiblefor
charge-exemptrepair.
• Problems caused by improper or insufcient
maintenance on the part of the customer.
• Trouble or damage caused by mishandling,
misusage, or storage that exceeds the design or
specication requirements.
• Trouble or damage was caused by modication or
repair that was handled by a party or parties other
than our consigned agent.
• Trouble or damage was caused by re, earthquake,
wind or ood damage, lightning strikes or other acts
of God that are not directly a result of problems with
this instrument.
■Checkingitemsafterunpacking
When the temperature sensor is delivered, check
the appearance for damage, and also verify that the
conguration indicated in the “Model and Sufx Code”
is in compliance with the specications written on the
order sheet.
CAUTION
Do not change the circuit or parts. The instrument
modication will void the explosion proof
certication.
2. NotesonSafety
It is absolutely imperative that users of this equipment
read and observe the safety instructions mentioned in
this manual in order to ensure the protection and safety
of operators.
2.1 Installation
• Lead cables linked with the temperature sensor,
such as a compensating lead cable or extension lead
cable, must be connected to terminals of receiving
instruments. An incorrect connection may cause a re
or an explosion.
• When the temperature sensor is dropped, people
may be injured since some temperature sensors are
heavy. Pay attention to the handling of temperature
sensors, especially resistance thermometers with
ceramic insulators or protections, which are very
delicate.
• Temperature sensors of ameproof type are
approved when that they are used under 60°C or
below, and that of temperature for Intrinsically safe
type is 55°C or below.
Conrm the ambient temperature is in accordance
with those conditions.
• After wiring, conrm if O-ring packing is furnished
and then close the cover surely in order to prevent
permeation of dust or water. Especially for the
explosion proof type, fasten the cover rmly using a
hexagonal 17 mm wrench.
Otherwise, it may be declined the capability of the
explosion proof.
• Screws or anges are used for installation of
temperature sensors. In case of screwing, apply
sealing tape or sealing agent for tapered thread and
apply O-ring gaskets for parallel thread. Then fasten
them rmly. In case of ange connection, insert
specied gaskets and screw up all bolts equally.
■Handlingcautionsforintrinsicallysafetype
TIIS intrinsically safe type (i3aG5)
Type TC TD RB
Certication number T28123 T28124 T28125
Combined barrier BARD200
Two or less BARD200
Lext ≤ 2.2 mH
Cext ≤ 1 μF
BARD300
Internal inductance Lint ≤ 20 μH
Internal capacitance Cint ≤ 2 nF
Ambient temperature Ta –10°C ≤ Ta ≤ 55°C (–14°F ≤ Ta ≤ 131°F)
Temperature Sensors
2nd Edition: July 2011(YK)
All Rights Reserved, Copyright © 2003, Yokogawa Electric Corporation
IM06B00A01-01EN
IM 06B00A01-01EN
2nd Edition

All Rights Reserved. Copyright © 2003, Yokogawa Electric Corporation IM 06B00A01-01EN
• The sheath can be bent providing that the bending
radius is larger than the twice of the sheath diameter.
However, the sheath will be damaged if it changes
the form again. When you bend the sheath in
the eld, we recommend that the bending radius
keep larger than ve times of the sheath diameter.
The metal sheathed resistance thermometers
have resistance element in the top of the sheath.
Therefore, do not bend the portion of the sheath with
100 mm length from the top.
• If the connection part of temperature sensors and
lead cables are exposed to high temperature,
the insulation resistance may be declined or the
measuring error may be increased. Therefore, keep
the temperature of the part at 80°C or less except
products for high temperature application.
• If the polarity is incorrect, it is impossible to measure
the correct temperature. Pay attention the color of
compensating cables because those colors change
with sensor type.
2.2 MaintenanceandInspection
• Flameproof sensors shall not be maintenance-
serviced with its power turned on. However, in cases
where maintenance servicing is to be conducted with
the power turned on, with the terminal head cover
removed, always use a gas detector to check that
there is no explosive gas in that location.
Do not attempt to change specications about
ameproof sensors.
• Since there are many cases of high temperature in
the plant where temperature sensors are installed, it
is very dangerous to maintain or inspect temperature
sensors during operation or just after shutdown.
• If the temperature sensors are used as footing, they
might be damaged.
2.3 Storage
• Store temperature sensors in dry and clean place.
When temperature sensors are kept in the place of
high humidity, the insulation resistance of them may
decline.
3. Wiring
Note that lead cables to connect temperature sensor
for thermocouple and for resistance are diffent.
(1)Thermocouples
For the extention wires, use the standrad
compensation lead wires recommended for each
thermocouple type. Incorrect use of compensation
wire type causes a large error. The color of wire
covering changes with type of compensation lead
wires and standard such as JIS, ASTM, IEC, etc. Also
pay attention to the polarity of compensation wires
when connect them.
(2)Resistancethermometersensor
Since 3-wire method is adopted in resistance
thermometer measurement usually, each sensor
requires 3 wires. The terminal symbols are described
as A, A, and B.
A
A A
B
B B B B
B
Thermocouple’s
Terminal Block
Resistance Thermometer
Sensor’s Terminal Block
–
+
–
+
F01E.ai
Figure1. TerminalBlocks
4. Grounding
In case the temperature sensor is connected with a
receiver, a shield cable may be grounded in order to
avoid the inuence of the noise. Generally, one-point
grounding is recommended.
Please refer to Figure 2 about the grounding points.
Thermocouples Compensation lead wire
ShieldSheath
Thermocouples Compensation lead wire
ShieldSheath
Grounding
Grounding Grounding
Reciever
Reciever
F02E.ai
Figure2. GroundingofShield
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