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1590 and 1575
Super-Thermometer Readouts for use with SPRTs and Thermistors -
Ordering Information |
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Model |
Description |
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Hart 1575A |
Super-Thermometer |
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Hart 1590 |
Super-Thermometer II |
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Multiplexers |
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Hart 2575 |
Multiplexer, 1575 |
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Hart 2590 |
Multiplexer, 1590 |
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Accessories |
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Hart 742A-25 |
Standard DC Resistor, 25Ω |
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Hart 742-100 |
Standard DC Resistor, 100Ω |
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Super-Thermometer Readouts |
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Customize Your Display
The graphic screen is easily modified to include
information that fits your application or preferences. Under the
display menu you select up to five lines of on-screen information
from 19 different options including:
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T-MEMORY |
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Current value minus the value in memory. |
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T(1) - T(2) |
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Channel one minus channel two. |
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MAXIMUM |
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Peak reading since last reset. |
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MINIMUM |
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Lowest value since last reset. |
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SPREAD |
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Maximum difference between readings. |
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AVERAGE |
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Computes average of previous samples. |
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STD DEV |
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Computes standard deviation of previous
samples. |
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Probe
Setup
Each probe's information is identified by its
unique serial number for assignment to a specific channel. You
select the desired resistance-to-temperature conversion formula,
set the probe constants, and select the reference resistor and the
drive current.
A
total of 16 probe setups are stored in internal memory. An
unlimited number can be stored to disc and selected when needed.
After a probe's information is entered the first time, the
Super-Thermometer is immediately set to match that probe by simply
selecting the probe's serial number.
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Automatic Calculation of
Constants
The Super-Thermometers automatically calculate the
required constants for the ITS-90 temperature conversion. Connect
your un-calibrated standards probe to the 1590, measure the
resistance at the fixed-points or against a calibrated standard,
and the 1590 stores the resistance readings and automatically
derives the correct constants.
You don't need a calculator and
a pad of paper. The Super-Thermometers enter the constants
directly to the probe setup, saving you time and preventing error
in the manual entry of constants.
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The Triple Point of Water
Take a reading in the TPW cell just prior to each
new measurement. The Super-Thermometers store the current RTPW
value and reference it during the conversion from resistance to
temperature.
This eliminates two sources of
measurement error. The drift of RTPW in the SPRT is
removed, and the error of the on-board reference resistors is
canceled. For convenience and maximum precision, you can even
enter the immersion depth of your SPRT in the cell to correct for
hydrostatic head.
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Graphic Feature
The Super-Thermometers feature real-time, on-scale
graphing for monitoring fluid bath stabilization or realizing
metal fixed-point plateaus. Simply monitor the graph for stability
on one or more multiple channels and take your readings in
resistance, temperature, or the ratio to the triple-point of
water.
The 3.5-inch disk drive stores
readings in an ASCII format for spreadsheet or graphing use.
Graphing resolution limits can be manually entered, or maximum
resolution is automatically set as the readings stabilize over
time. Temperature measurement labs save time by not monitoring or
taking data every few seconds.
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