Remote Start Option - Ametek 241CE II Operator's Manual

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 con-
nections for this optional voltage input are illustrated on the Customer
Connections drawing (Chapter 3) 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 flag is
set. This flag indicates that the Cooling Stage can begin once the purging
time (PTime) has elapsed. When the signal goes above 2.5 VDC, the flag 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 Remote 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
accomplished 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 off the purge sole-
noid using the appropriate Modbus register. For details about the Modbus
registers, refer to the Model 241CE II Analyzer Serial Communication
Interface (Modbus) Manual Supplement.
A-6 | Model 241CE II Hydrocarbon Dewpoint Analyzer