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SPECIAL CASE — ALTERED SENSOR CABLE LENGTH
Changing the standard 20 ft. (6 m) sensor cable length, by shortening it or
adding an interconnect cable, affects temperature measuring accuracy. The
factory-certified T factor is based on standard cable length. To compensate for
altered cable length measuring error, change the certified T factor entry:
Shortened Sensor Cable: To increase the transmitter temperature reading to
match the known solution temperature, decrease the T factor by 3.85 ohms for
each °C difference.
Added Interconnect Cable: To decrease the transmitter temperature reading to
match the known solution temperature, increase the T factor by 3.85 ohms for
each °C difference.
Example: Suppose the known solution temperature is 50°C and the transmitter reads 53°C due
to interconnect cable resistance. Multiply the 3°C difference by 3.85 ohms to get 11.55.
Then increase the sensor T FACTOR by adding 11.55 to it and entering that value. If,
due to a shortened sensor cable, the transmitter was reading 3°C less than the known
solution temperature you would decrease the sensor T FACTOR by subtracting 11.55
from it.
3. After the
screen re-appears, press ESC key twice to return
to the screen.
7.3 7.3
7.3 7.3
7.3
SETSET
SETSET
SET
°°
°°
°
C OR C OR
C OR C OR
C OR
°°
°°
°
F (temperature display format)F (temperature display format)
F (temperature display format)F (temperature display format)
F (temperature display format)
The MEASURE screen can be set to display temperature values in °C or °F. In either case, the
display resolution for measured temperature is always “XX.X.”
1. With the screen displayed, press
××
××
× key — not
ØØ
ØØ
Ø key —
twice to display .
2. Press ENTER key to display a screen like . Use
ØØ
ØØ
Ø and
××
××
×
keys to select the displayed temperature units (°C or °F), and press ENTER key to
enter it.
7.4 Configuring Analog Output7.4 Configuring Analog Output
7.4 Configuring Analog Output7.4 Configuring Analog Output
7.4 Configuring Analog Output
The transmitter provides an isolated 4-20 mA analog output. During normal measurement
operation, the output is active but can be held at the last measured value for up to 30 minutes by
using the “HOLD OUTPUT” function in the TEST/MAINT menu. (See Section 9.2 for details.)
During calibration, the output is automatically held at the last measured value and, upon
completion, returned to its active state.
SET PARAMETER (representation)
The output can be assigned to represent the SENSOR (measured conductivity, % concentration
or TDS) or measured TEMPERATURE.
1. With the screen displayed, press
××
××
× key — not
ØØ
ØØ
Ø key —
twice to display .
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