Cole-Parmer 18200-30 Data Sheet

Specifications

18200-30

Cole-Parmer Instrument Company

625 East Bunker Court

Vernon Hills, Illinois 60061-1844

[phone]

[phone] (Fax)

800-323-4340

www.coleparmer.com

e-mail: [e-mail]

Document Revision 1.1, August, 2008

© Copyright 2008, Measurement Computing Corporation

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

Software programmable to match sensor type

Differential input voltage range
for the various sensor categories

Thermocouple

±0.080 V

RTD

0 to 0.5 V

Thermistor

0 to 2 V

Semiconductor sensor

0 to 2.5 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
disabled

30 nA max.

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 sensor.

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

Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input

Table 1. Generic analog input specifications

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Specifications 18200-30

Sensor Category

Conditions

Specification

Disabled

Thermocouple

8 differential channels

Semiconductor sensor

8 differential channels

RTD and thermistor

2-wire input configuration with a single sensor

4 differential channels

2-wire input configuration with two sensors

8 differential channels

3-wire configuration with a single sensor per channel pair

4 differential channels

4-wire input configuration with a single sensor

2 differential channels

4-wire input configuration with two sensors

4 differential channels

Parameter

Conditions

Thermocouple

J: -210 °C to 1200 °C

K: -270 °C to 1372 °C

R: -50 °C to 1768 °C

S: -50 °C to 1768 °C

T: -270 °C to 400 °C

N: -270 °C to 1300 °C

E: -270 °C to 1000 °C

B: 0 °C to 1820 °C

RTD

100 ohm PT (DIN 43760: 0.00385 ohms/ohm/°C)

100 ohm PT (SAMA: 0.003911 ohms/ohm/°C)

100 ohm PT (ITS-90/IEC751:0.0038505 ohms/ohm/°C)

Thermistor

Standard 2,252 ohm through 30,000 ohm

Semiconductor / IC

TMP36 or equivalent

Channel configurations

Table 2. Channel configuration specifications

Note 1: Internally, the 18200-30 has four, dual-channel, fully differential A/Ds providing a total of eight

differential channels. The analog input channels are therefore configured in four channel pairs
with CH0/CH1 sensor inputs, CH2/CH3 sensor inputs, CH4/CH5 sensor inputs, and CH6/CH7
sensor inputs paired together. This "channel-pairing" requires the analog input channel pairs be
configured to monitor the same category of temperature sensor. Mixing different sensor types of
the same category (such as a type J thermocouple on channel 0 and a type T thermocouple on
channel 1) is valid.

Note 2: 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 3: The factory default configuration is Disabled. The Disabled mode will disconnect the analog

inputs from the terminal blocks and internally ground all of the A/D inputs. This mode also
disables each of the current excitation sources.

Compatible sensors

Table 3. Compatible sensor type specifications

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Specifications 18200-30

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

Sensor Type

Temperature Range (°C)

Maximum Accuracy Error

TMP36 or equivalent

-40 to 150 °C

±0.50 °C

Accuracy

Thermocouple measurement accuracy

Table 4. Thermocouple accuracy specifications, including CJC measurement error

Note 4: Thermocouple measurement accuracy 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 18200-30 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 5: Thermocouples must be connected to the 18200-30 such that they are floating with respect to

GND (pins 9, 19, 28, 38). The 18200-30 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 6: When thermocouples are attached to conductive surfaces, the voltage differential between

multiple thermocouples must remain within ±1.4 V. For best results we recommend the use of
insulated or ungrounded thermocouples when possible.

Semiconductor sensor measurement accuracy

Table 5. Semiconductor sensor accuracy specifications

Note 7: Error shown does not include errors of the sensor itself. These specs are for one year while

operation of the 18200-30 unit is between 15 °C and 35 °C. Please contact your sensor supplier
for details on the actual sensor error limitations.

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