ADS Environmental Services Model 3600 530002 A2 - Manual (Page 126)

A-8 ADS 3600 Flow Monitor O&M Manual
Pressure Depth Sensor
The following table contains information and specifications for the pressure depth
sensor.
Measurement
Technique
The pressure sensor gauge references the difference in atmospheric and water
pressures in the sewer pipe to determine the depth of flow in the pipe.
Effective Range The sensor has a range up to 3.35 m (11 ft). Greater ranges are available through
factory modifications.
Resolution The resolution is within 1.0 mm (0.04 in.).
Calibration The sensor is factory calibrated to compensate for temperature drifts and nonlinearity.
The software operator can remotely adjust offset drifts via a telephone and modem.
Temperature
Compensation
Readings from the temperature sensor, located inside the pressure depth sensor
housing, are used to compensate for the temperature effects on the depth data.
Compensation is made using pre-calculated look-up tables that are specific to each
individual sensor and are based on factory-calculated calibration data.
Housing
The housing dimensions are 12.7 cm (5.0 in.)
×
35 mm (1.36 in.)
×
25 mm (1.0 in.), and
the housing is a streamlined, molded epoxy shell.
Depth Board Digital Specifications
The following table contains digital specifications for the depth board.
Processor
Memory
The depth board uses an 80C32 CMOS microprocessor.
The EPROM has 64K bytes.
The RAM has 32K bytes.
Communications The depth board uses a UART to communicate over a logic-level bus with the processor
board.
Functions The depth board transmits the following data to the processor board: depth readings
from selected transducer pairs, the quality of the readings, temperature readings from
both temperature sensors, and the number of over-ranges (no echo).