PN 903-8797, Rev A
Remote Start Option
For applications such as adsorbent-bed switching, it may be desirable to set
the analyzer to begin its Cooling Stage at a designated time. The Remote Start
option allows you to set up when the analyzer will begin the cooling cycle.
For this option, an extra isolated analog voltage input is added. The connec-
tions for this optional voltage input are illustrated on the Customer Connec-
tions drawing (Chapter 2) as the spare analog input positive and negative
terminals.
The customer is responsible for providing a 0–5 VDC input. When the Remote
Start signal drops below mid-scale, 2.5 VDC, an internal ag is set. This ag
indicates that the Cooling Stage can begin once the purging time (PTime) has
elapsed. When the signal goes above 2.5 VDC, the ag is cleared. The analyzer
will purge until the signal drops again below mid-scale.
The Purging/Hold Stage terminates when the purging timer expires. The Re-
mote Start signal indicates that the analyzer’s measuring cycle is permitted to
proceed to the Cooling Stage (input less than 2.5 VDC). The Cooling Stage will
proceed normally, regardless of the status of the input voltage.
The remote start control of the beginning of the cooling stage can also be ac-
complished using the Modbus interface. If the purge time is set for a long time
period such as 180 minutes, the cooling cycle can be set to start at any time
during the 180 minute period by turning o the purge solenoid using the ap-
propriate Modbus register. For details about the Modbus registers, refer to the
241CE II Analyzer Serial Communication Interface (Modbus) Manual Supple-
ment.
A-6 | 241CE II Hydrocarbon Dewpoint Analyzer
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