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COMMON QUESTIONS
The battery-operated cellular Survey Instrument Point is simply referred to as
the “SIP-CB” throughout this document.
Mercury’s DC-2000 data collection system, consisting of software and
hardware, is simply referred to as “DC-2000” throughout this document.
What does the SIP-CB do?
Many metering devices produce electrical pulses to represent what they are measuring. An
electric meter might generate one pulse for every kilowatt consumed. A vending machine might
generate a pulse for each beverage dispensed.
Mercury’s SIP-CB can count low frequency pulses from up to four independent sources. It counts
these pulses over specific periods of time ranging from 1 minute up to 60 minutes. At the end of
each time period it saves the total counts in its memory. The counting process starts over for the
next time period and this continues for hours, days or weeks at a time.
At regular intervals, or on demand, the SIP-CB establishes a radio link with a GSM cellular
telephone service provider and transmits its stored information to a central computer system for
processing. This can be accomplished using a circuit-switched data (CSD) connection to an
analog modem at the computer site. Or the SIP-CB can exchange data with an Internet server
running on that computer. Mercury provides a powerful application program called “DC-2000”
which can process CSD or Internet calls from thousands of remote units, store their data in a
database and present the results in a variety of formats.
Alternatively any of the four pulse-counting inputs can be configured to monitor alarm or status
conditions. The SIP-CB also has another four inputs dedicated to alarm or status processing
only. Therefore, if pulse-counting is not required, the SIP-CB is capable of monitoring up to 8
alarm or status conditions. The SIP-CB can be programmed to place an immediate call when any
of these conditions occur or simply report them on the next scheduled call.
The SIP-CB also offers four independent outputs. An output can be programmed to replicate any
one of the pulse or alarm inputs. This allows 'daisy-chaining' of metering instruments when
multiple agencies have an interest in collecting the same information. Alternatively, the state of
any output can be controlled remotely for the purpose of controlling external devices such as
pumps, lights or audible alarms.
How is the SIP-CB powered?
The SIP-CB is designed to be powered from a single 3.6V lithium battery pack. But only certain
approved packs can be used in hazardous locations.
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