Depth – Water Level Bubbler
Water Level Bubbler
The PR-7200 is a complete water level bubbler system for measuring the depth of water.
An air tube runs from the PR-7200’s compact compressor to the water, where the tube is submerged. This allows the PR-7200 to be sited safely away from the water, meaning only replaceable tubing can be damaged.
Based on the advanced liquid level sensor of the PR-6100, the PR-7200 provides a measurement of the attached capillary tube pressure, conversion, output to recorders and controllers and control over the PR-7200 integrated compressor module.
Serial or Analogue Ouput?
The PR-7200 series can have either an analogue output or an integrated logger with serial output. It is possible to have both options simultaneously.
PR-7200 Operating Principal
When a measurement is activated by a preset command or by an external controller (logger, PLC, RTU etc.), a measurement sequence begins. The compressor runs for several seconds only and charges the capillary tube with a high flow purge. A dwell interval then allows the tube pressure to equalize with hydrostatic pressure for a set time period. After this, pressure measurement is taken, processed and displayed or output to the controller.
Greenspan has made our range of water quality sensors in Australia for over two decades. Our experience has allowed us to design sensors that reliably deliver accurate data in the harshest environments Australia has to offer.
With every Greenspan water quality sensor, you receive; local support from our experienced sales and service technicians, local repairs and recalibration from our Melbourne-based engineers, and access to local spares from our factory in Melbourne. No other brand of water quality sensor can offer such exceptional service.
|Measurement Technique||Remote Pressure Bubble System|
|Range||10, 20, 35, 70 meters freshwater (15, 30, 50 and 100psi) -non standard ranges are available|
|Accuracy||Digital output (Display, RS232, SDI-12):|
Linearity: +/-0.05% of FS
Temperature: +/-0.001% per °C
Repeatability: +/-0.01% of FS
Long term drift: <0.05% of FS/year
Analogue output: +/-0.15% over 0°C to + 50°C
|Units||kPa, psi, feet, inches, meters, centimeters, flow and volume units based on above|
|Resolution||Analogue: 12 bit|
Digital: 16 bit
Display m – 3 D.P. (eg. 2.345m)
mm – 0 D.P. (eg. 2345mm)
ft – 2 D.P. (eg. 7.69ft)
in – 1 D.P. (eg. 92.3in)
p.s.i. – 3 D.P.(eg. 3.518psi)
kPa – 3 D.P.(eg. 5.025kPa)
|Temperature||Operating range: -10°C to 60°C|
|Response Time||30 seconds (default) measurement sequence from standby|
Immediate if using Continuous Run Mode
|Type||Piezo resistive differential pressure sensor (one side vented to atmosphere)|
|Output options||Analogue: 4-20mA current, 3 wire loop (up to 450 ohm load @12Vdc)|
Digital: SDI-12 data protocol version 1.3 RS232C data
Simultaneous digital and analogue output
|Tube connection||¼“ tube brass fitting with 3/8” tube adapter standard with a selection of other tube fittings available|
|Power supply||12Vdc, 16A compressor supply –|
use battery and charger.
PR-7100 sensor uses same supply
Standby @12V: <10 mA
Active @12V: <120mA backlight on* <25mA backlight off* *plus current loop if used
|Surge protection||Inputs/ outputs protected against Transients by a secondary protection circuit that can absorb up to 1.5kW for 1ms|
|Display||4 line x 20 character LCD (7 x 5 dot matrix) with backlight, extended temperature range|
|Weight||4.2kg PR-7200 only|
5.3kg shipping weight
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