Cole-Parmer 18200-40 Data Sheet
Specifications
18200-40
Cole-Parmer Instrument Company
625 East Bunker Court
Vernon Hills, Illinois 60061-1844
(847) 549-7600
(847) 247-2929 (Fax)
800-323-4340
www.coleparmer.com
e-mail: techinfo@coleparmer.com
Document Revision 1.0, August, 2008
© Copyright 2008 Measurement Computing Corporation, TCR1-2
Specifications
Parameter
Conditions
Specification
A/D converters
Four dual 24-bit, Sigma-Delta type
Number of channels
8 differential
Input isolation
500 VDC minimum between field wiring and
USB interface
Channel configuration
Thermocouple sensor type
Differential input voltage
range
Thermocouple
±0.080 V
Absolute maximum input
voltage
±C0x through ±C7x relative to
GND (pins 9,19,28,38)
±25 V power on, ±40 V power off.
Input impedance
5 Gigohm, min.
Input leakage current
Open thermocouple detect enabled
105 nA max.
Normal mode rejection ratio
f
IN
= 60 Hz
90 dB min.
Common mode rejection
ratio
f
IN
= 50 Hz/60 Hz
100 dB min.
Resolution
24 bits
No missing codes
24 bits
Input coupling
DC
Warm-up time
30 minutes min.
Open thermocouple detect
Automatically enabled when the channel pair
is configured for thermocouple sensors.
The maximum open detection time is 3
seconds.
CJC sensor accuracy
15 °C to 35 °C
±0.25 °C typ.,
±0.5 °C max.
0 °C to 70 °C
-1.0 to +0.5 °C max
Sensor Category
Conditions
Specification
Thermocouple
J, K, S, R, B, E, T, or N
8 differential channels
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input section
Table 1. Generic analog input specifications
Channel configurations
Note 1: Channel configuration information is stored in the EEPROM of the isolated microcontroller by
the firmware whenever any item is modified. Modification is performed by commands issued
over USB from an external application, and the configuration is made non-volatile through the
use of the EEPROM.
Note 2: The factory default configuration is Type J.
Table 2. Channel configuration specifications
1
Specifications 18200-40
Sensor Type
Maximum error
Typical error
Temperature range
J
±1.499 °C
±0.507 °C
-210 to 0 °C
±0.643 °C
±0.312 °C
0 to 1200 °C
K
±1.761 °C
±0.538 °C
-210 to 0 °C
±0.691 °C
±0.345 °C
0 to 1372 °C
S
±2.491°C
±0.648 °C
-50 to 250 °C
±1.841 °C
±0.399 °C
250 to 1768.1 °C
R
±2.653 °C
±0.650 °C
-50 to 250 °C
±1.070 °C
±0.358 °C
250 to 1768.1 °C
B
±1.779 °C
±0.581 °C
250 to 700 °C
±0.912 °C
±0.369 °C
700 to 1820 °C
E
±1.471 °C
±0.462 °C
-200 to 0 °C
±0.639 °C
±0.245 °C
0 to 1000 °C
T
±1.717 °C
±0.514 °C
-200 to 0 °C
±0.713 °C
±0.256 °C
0 to 600 °C
N
±1.969 °C
±0.502 °C
-200 to 0 °C
±0.769 °C
±0.272 °C
0 to 1300 °C
Number of input channels
Maximum throughput
1
2 Samples/second
2
2 S/s on each channel, 4 S/s total
3
2 S/s on each channel, 6 S/s total
4
2 S/s on each channel, 8 S/s total
5
2 S/s on each channel, 10 S/s total
6
2 S/s on each channel, 12 S/s total
7
2 S/s on each channel, 14 S/s total
8
2 S/s on each channel, 16 S/s total
Accuracy
Thermocouple measurement accuracy
Table 3. Thermocouple accuracy specifications, including CJC measurement error
Note 3: Thermocouple specifications include linearization, cold-junction compensation and system noise.
These specs are for one year, or 3000 operating hours, whichever comes first and for operation of
the 18200-40 between 15 °C and 35 °C. For measurements outside this range, add ±0.5 degree to
the maximum error shown. There are CJC sensors on each side of the module. The accuracy
listed above assumes the screw terminals are at the same temperature as the CJC sensor. Errors
shown do not include inherent thermocouple error. Please contact your thermocouple supplier for
details on the actual thermocouple error.
Note 4: Thermocouples must be connected to the 18200-40 such that they are floating with respect to
GND (pins 9, 19, 28, 38). The 18200-40 GND pins are isolated from earth ground, so connecting
thermocouple sensors to voltages referenced to earth ground is permissible as long as the
isolation between the GND pins and earth ground is maintained.
Note 5: When thermocouples are attached to conductive surfaces, the voltage differential between
multiple thermocouples must remain within ±1.4V. For best results we recommend the use of
ungrounded or insulated thermocouples when possible.
Throughput rate
Table 4. Throughput rate specifications
2
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