DOC-0128 Rev F
© 2017 DROPLET MEASUREMENT TECHNOLOGIES
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T1 – Tsample
is a temperature differential that determines the
temperature of the top of the column
relative to the sample air temperature.
TNafion – T1, Tinlet – T1,
and
TOPC – T3
determine the
temperature of the Nafion humidifier, the inlet manifold, and the OPC relative to temperatures at
points on the column. Recommended values for these temperature differentials are given below.
Recommended Value
Range
(
T1 – T Sample)
2.0° C
0 °C to 10 °C
(
T Nafion – T1)
-1.0° C
-5 °C to 5°C
(
T Inlet – T1)
1.0° C
0 °C to 5 °C
(
T OPC – T3)
2.0° C
1 °C to 10 °C
The
Column Temps Stabilized
light indicates if T1, T2, and T3 are less than 0.4° from their set values.
Even when the light is on, additional time may be needed before the entire unit is stabilized and data
are consistent.
The light will turn off during SS% changes. For small SS% changes, the light will typically be off for less
than one minute. If the
Column Temps Stabilized
light never comes on, refer to the Troubleshooting
section.
TEC Relay
switches the instrument’s 28 VDC power bus on and off. This supplies power to the heaters,
the TEC units, and the sample pump. The default value is on, but it can be useful to turn off
TEC Relay
during troubleshooting.
Delta T(C)
is the temperature gradient used to calculate values for T1 Set, T2 Set, T3 Set, Inlet Set,
Nafion Set, and OPC Set.
•
In
Auto
SS
mode,
Delta T(C)
is an indicator only, where
Delta T(C)
is determined by the
Current SS
and the temperature gradient slope and intercept coefficients. (See sections
•
In
Manual
SS mode,
Delta T(C)
becomes a control and can be set through the
Temps
tab or
through the serial port.
