Section 2: Introduction; General Description; Module Overview; Das3217-Ptp Configurations - Scanivalve DSA3217-PTP Series Operation And Service Manual

DSA3200-PTP

SECTION 2: INTRODUCTION

General Description

The Digital Sensor Array (DSA) is a stand-alone electronic
pressure scanner which can accept up to 16 pneumatic
inputs. The module is specifically designed for use in appli-
cations where long calibration intervals, simple operation
and high accuracy are required. Each DSA-PTP incorporates
16 individual, temperature compensated, piezoresistive
pressure sensors, an A/D converter and a microproces-
sor. Each pressure sensor is characterized over pressure
and temperature. This information is stored in EEPROM
memory and enables the module to directly output cor-
rected data in engineering units.
The sensors within each DSA3200-PTP series module are
arranged in groups of eight (8). Each block of eight (8)
sensors has its own calibration valve. This calibration valve
has four (4) modes of operation and allows the DSA-PTP
module to perform measurement, calibration and purge
functions. The four (4) modes are:
• Measure
• Calibrate
• Isolate
• Purge
The calibration valve mode is selected by applying 90-120
psi control pressure configurations unique for each
operation mode. The DSA-PTP calibration valve utilizes
"Normally Px" valve logic where the valve defaults to
the measurement mode when no control pressures are
applied.

Module Overview

The DSA3200-PTP series is available in two basic configu-
rations; the DSA3217-PTP and the DSA3218-PTP. Both
configurations offer 16 pressure inputs, both operate using
the same software commands and both offer corrected
data output directly in engineering units. The difference
between the modules is the packaging and the intended
applications. The DSA3217-PTP is enclosed in a stain-
less steel, splash resistant enclosure intended for most
laboratory, educational or controlled environments. The
DSA3218-PTP however, is enclosed in a stainless steel,
splash resistant, shock mounted enclosure with Swagelok®
fittings on all pneumatic connections. It is intended for
applications such as gas turbine testing, flight testing,
industrial applications and other more rugged environ-
ments.
Section 2: Introduction
In addition to the more rugged casing on the DSA3218-PTP
modules, additional options of a heater or a cooling kit are
offered. The heater option allows the module to be oper-
ated below the 0 °C temperature compensation range of
the standard DSA3218-PTP or DSA3217-PTP modules. The
cooling kit is recommended for applications where the
ambient environment temperatures are likely to exceed 55
°C.
Both DSA3217-PTP and DSA3218-PTP modules are avail-
able with a variety of sensor configurations. The standard
configuration is 16 channels of the same pressure range,
however modules can be configured as dual-range units
with 8 channels of one pressure range and 8 channels of
another pressure range, 'True-Differential' measurement
modules which provide 8 channels of differential pressure
measurement, absolute pressure measurement modules
or units with individual reference ports for each sensor
(DSA3217-PTP only).

DAS3217-PTP Configurations

The DSA3217-PTP is available in 5 basic configurations.

DSA3217-PTP/16Px

The basic DSA3217-PTP/16Px module provides 16 chan-
nels of the same 'gauge' pressure range sensors. These 16
pressure transducers are configured into two (2) groups of
eight (8) each. Each group of eight (8) transducers shares a
common calibration valve and a common reference mani-
fold. Single range modules tie the two reference manifolds
together and the two calibration valves to provide the
user with a single reference and a single calibration port to
connect to. Figure 2.1 depicts the top panel of a standard
DSA3217-PTP/16Px.
Figure 2.1 - DSA3217-PTP/16Px top panel
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