Intempco TT820D Manuale utente
INTEMPCO’s TT820D
Digital Thermocouple Transmitter
1. Description
The TT820D is a digital transmitter that converts the signal from a thermocouple
to a linearized 4-20 mA output. The TT820D features a one point calibration
adjustment with two push buttons as well as an advanced software programming
via the RS-232 input. The advanced programming allows a two points calibration,
a re-scaling, filtering options and identification of the transmitter.
2. Note
Prior to unpacking and installation, please read the operating instructions and
follow them carefully. These units are to be used, serviced, and repaired only by
individuals who are familiar with the operating instructions and the applicable
regulations for operational safety and accident prevention.
3. Control of Units
The units are calibrated and checked before shipment and shipped in good
conditions. If you detect a visible defect on the unit, we recommend that you
carefully check the packing material. In the event of a defect, please immediately
notify the mail service/freight forwarder, as they are responsible for shipping
damage.
INSTRUCTION MANUAL
1
4
8. Set the temperature bath to the maximum range of the TT820D transmitter
(Ex: 200 oC = 20 mA )
9. With the temperature standard, verify the bath temperature and enter the
value in the “Second Point” text box located in the “2 Points Calibration”
section of the “Programming” window.
10. Immerse the TT820D probe in the temperature bath and wait for the
output stabilizes.
11. Click on the “Read” button associated to the “Second Point” calibration.
12. Click on the “Process” button, located in the “2 Points Calibration”
section of the “Programming” window, to update the calibration
parameters in the TT820D.
7. Calibration with a thermocouple simulator
Both calibrations, one point calibration and advanced calibration, can be
performed with a thermocouple simulator. In both cases, proper thermocouple
wires should be used to connect the simulator to the TT820D transmitter.
For the one point calibration, simply replace the probe (thermocouple) by the
simulator and set the output of the simulator to mid-range of operation. Wait
for output signal stabilizes and adjust, with the “UP” and “DW“ push buttons,
the output to 12.00mA.
For the two points calibration, simply replace the probe (thermocouple) by the
simulator and follow the same procedure as for the ”Advanced Calibration“.
Instead of using a temperature bath, adjust the output of the simulator to the
minimum and maximum values of the range.
2511, Guenette Montreal (Quebec) Canada H4R 2E9
Tel.: [514] 337-7471 Fax : [514] 337-7475
www.intempco.com
Power Supply : 12-36V DC, polarity protected
Input : Thermocouples type J, K, T, E
Output : 4-20mA
Supply Voltage Effect : ±0.02% / V
Load Capability : Rmax.=( Vsupply - 12V ) / 20mA
Zero Drift : ±0.1% / °C
Span Drift : ±0.1% / °C
Ambient Operating Temperature : -40 to +80°C (-40 to +158°F)
Warm-up time : 30 sec.
Accuracy :
K, E, J, T : ±0.5% of FS
Cold Junction Compensation Error :
K : ±1°C max. at -20 to 50°C
J : ±2°C max. at -20 to 50°C
T, E : ±3°C max. at -20 to 50°C
8. Specifications
6. Calibration Instructions
The TT820D comes factory calibrated. If you need to re-calibrate the unit, two
options are available. The first one is the “One Point Calibration” and the second
one is the “Advanced Calibration “.
One Point Calibration
In some cases, a single point calibration is sufficient especially when a process is at
a fixed set point.
1. With a temperature standard, verify the correct process temperature and
compare it to the TT820D reading.
2. With the “UP” and “DW “ push buttons, located on the front of the
TT820D transmitter, adjust current output to the value read by the standard.
Advanced Calibration
To perform the “Advanced Calibration” you will need :
• The MIST TT820D Programming Kit. (ordered separatly)
• A milliamp indicator or a loop-powered calibrator.
• A temperature bath.
• A standard reference temperature sensor.
• Test leads
3
2
4-20mA
Indicator
TT820D
Communication
Interface
AC Adapter
110V AC
RS232
1. Connect the TT820D as per the wiring diagram shown above.
2. Start the MIST T/C software.
3. Go in the Programming section of the software by clicking on the
“Program” button.
4. Set the temperature bath to the minimum range of the TT820D transmitter
(Ex.: 0oC = 4mA)
5. With the temperature standard, verify the bath temperature and enter the
value in the “First Point” text box located in the “2 Points Calibration”
section of the “Programming” window.
6. Immerse the TT820D probe in the temperature bath and wait for the
output stabilizes.
7. Click on the “Read” button associated to the “First Point” calibration.
+i
-i
Tx
Rx
+
_
Tx
Rx
E
F
G
H
D
C
+TC
-TC
2.448”
[
62.18]
2.52”
[64.00]
.670”
[17.02]
.490”
[12.45 ]
4. Dimensions
+
_
Power Supply
12-36V DC
4-20mA
Indicator
The diagram above represents the connection method to provide the 4-20mA with
a current loop output. The connections should be made in the following order :
1. Connect the Thermocouple to the «C» and «D» terminals on the TT820D.
Be sure to respect the polarity of the thermocouple (C to Neg. D To Pos.)
otherwise the output will not correspond to the right reading.
2. Connect the positive side of the power supply (12-36 VDC) to the «E »
terminal on the TT820D.
3. Connect the positive side of the current loop indicator to the «F»terminal
on the TT820D.
4. Connect the negative side of the current loop indicator to the negative side
of the power supply (12-36 VDC).
Note : i) It takes about 30 seconds, due to the filtering features, before the output
signal stabilizes to its value.
ii) The indicator could be replaced by a controller, a data logger, etc.
In any case, be sure to respect the maximum load allowed on the loop,
given by :
Rmax. = [(Vsupply – 12V)/20mA]
5. Electrical Connections
TT820D
E
F
D
C
+TC
-TC
Indice
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