pH Amp
Owner’s Guide
26
Setting the Range
The
Range
pop-up menu is used to select the input range, or
sensitivity, of the temperature measurement, e.g. the
2 V
setting is for
up to 40 °C and the
5 V
setting is for up to 100 °C.
Inverting the Signal
The
Invert
checkbox changes the polarity, to invert displayed signals.
Units
Click
Units…
to display the Units Conversion dialog, with which you
can set the units and calibrate the channel. The signal in the data
display area of the Temperature dialog is transfered to the data
display area of the Units Conversion dialog – use the Pause button if
you want to capture a specific signal. The raw temperature signal is in
volts and must be converted to degrees Celsius, Fahrenheit or Kelvin
for relevant analysis. The temperature amplifier has been factory set,
for the RTD temperature probe provided with the unit, to produce
0 mV at 0°C with an output of 50 mV/°C. If temperature accuracy is
of critical importance, you should use two precision temperature
sources to calibrate the temperature probe more accurately.
Note: when using the pH Extension with automatic temperature
compensation, the Temperature signal must first be calibrated in
degrees Celsius (°C), degrees Fahrenheit (°F) or Kelvin (K).
This units conversion only applies to subsequently recorded signals,
so it is more limited than choosing
Units Conversion…
from the
Channel Function pop-up menu, as it does not allow conversion of
individual blocks of data. For more information about units
conversion, see the LabChart Help Center.
The Temperature Probe
The pH Amp is supplied with a RTD type temperature probe with
100
Ω
nominal resistance, to which the temperature amplifier is
factory set to produce 0 mV at 0°C and an output of 50 mV/°C. Only
use these values to calibrate the probe supplied with the pH Amp. You
can substitute other RTD probes for the one provided, however the
factory calibration will no longer apply, and you will have to use two
precision temperature sources to calibrate the probe.
Summary of Contents for pH Amp
Page 1: ...pH Amp Owner s Guide ...
Page 12: ...pH Amp Owner s Guide 12 ...
