Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
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http://www.acromag.com
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31
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https://www.acromag.com
Input
…
Input Zero and Full-Scale Adjustment:
Nominal input ranges are selectable and
range endpoints are adjustable over the full range of input temperature/resistance.
Input Zero-Scale and Full-Scale selections must be within the nominal range and will
be mapped to 0% and 100% at the output. Keep in mind that the input resolution
diminishes below nominal as the programmed input range is reduced. Likewise, error
is magnified as the input span is reduced.
Sampling Rate (ADC):
Input is sampled at a variable rate according to the input filter
selection as follows:
ADC Sampling rate (Samples/Second) per Input Filter
None
Low
Medium
High
107.325sps
42.93sps
12.63sps
1.665sps
Noise Rejection (Common Mode):
Varies with input and input filter selection
between 88dB (no filter) and 124dB (high filter),
typical with 100Ω input unbalance.
Noise Rejection (Normal Mode):
Varies with input and input filter selection. Table
below indicates the typical rejection at 60Hz for each input and input filter selection.
Note that at the medium and high filter settings, the ADC converter adds 80dB
minimum of rejection for frequencies between 49Hz and 61Hz.
Typical 60Hz Rejection per Input Filter
None
Low
Medium
High
17dB
34dB
> 80dB
> 80dB
Lead-Wire Compensation:
Requires balanced [+] and [L] sensor leads (same size,
length, & type) and only used with three-wire configuration.
Lead-Wire Resistance Effect:
Four-wire configuration
: Less than 0.001°C per Ω of
unbalance, typical. Three-wire and two-wire configurations
: 3.5°C per Ω of
unbalance, typical (Pt100), 1.4°C per Ω of unbalance, typical (Ni), 25.5°C per Ω of
unbalance, typical (Cu). Maximum resistance of 25Ω per lead.
Lead Break/Sensor Burnout Detection:
Can be set for Over-range or Under-range
open sensor or lead break detection. Over-range output limit is approximately 24mA.
Under-range limit is approximately 3.5mA.
Output
Output Range:
4 to 20mA DC nominal range, with under-range capability down to
3.5mA, and over-range capability up to 24mA. The output signal is linear with respect
to the measured temperature or resistance of the RTD or resistive element.
Output Accuracy:
Accuracy is better than
0.05% of output span, typical (±0.1%
maximum), for input spans 10% to 100% of full range. Relative accuracy varies with
calibrated input and output span. Accuracy includes the combined effects of
repeatability, terminal point conformity, and linearization, but does not include
sensor error.
Output Ambient Temperature Drift:
Includes the combined effects of zero and
space drift over temperature and is better than
50ppm/
C (±0.0050%/
C) over the
ambient temperature range for reference test conditions (see Input Specifications).
