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Appendix A: Technical Specifications
General Specification
The AquiStar
®
PT2X is a microprocessor based digital intelligent sensor designed to
measure and record pressure, temperature and time, utilizing state-of-the-art low power,
battery operated circuitry.
Pressure measurement is accomplished utilizing an extremely rugged and stable piezo-
electric media-isolated pressure element combined with a 16-bit delta/sigma analog-to-
digital converter. This provides extremely accurate and stable pressure input into the
microprocessor on the circuit board that measures the pressure, stores the data in one
megabyte of on-board eprom, and communicates the information via a serial communi-
cation link (RS485) to the host computer.
Temperature measurement is accomplished utilizing a temperature sensor chip, and time
is measured utilizing a real-time clock chip with battery backup.
Because of advancements in surface mount chip technology, INW has been able to
create a circuit that is only 2” long by .65” wide and will run using two AA batteries for
59 weeks*. The compact size of this circuit compresses technology into a size that
allows this circuit and two AA batteries to fit in our analog sensor packaging, which
provides an upgrade path for existing PS9800 customers.
* Using fresh batteries, taking readings every 15 minutes and uploading the data once a
week to a host computer.
Wiring and Component Information
PT2X Wiring Information:
Cable Type: 9-conductor, vented
Shield
=
Ground
White
=
Vaux (5.5 to 15 VDC)
Brown
=
Digital out
Orange
=
Vbat+ (1.8 to 3.3 VDC)
Blue
=
Ground
Yellow
=
Comm D+
Purple
=
Comm D-
