The KPSI 500 submersible hydrostatic level transducer represents the leading edge of level sensing technology available today. Incorporating a highly stable media-isolated sensor, the KPSI 500 features SDI-12 serial-digital interface. SDI-12 is a standard for interfacing data recorders with microprocessor-based sensors, especially in the environmental monitoring field. The transducer meets the demanding requirements of the USGS Office of Surface Water (OSW) accuracy specification for stage monitoring.
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KPSI 500 Features
- Level Ranges up to 230 ft (70 m) H2O
- Unsurpassed Accuracy of ±0.05% Total Error Band
- SDI-12 Communication Interface
- Welded 316 SS or Titanium Construction
- On-board Surge Protection
- Optional Lifetime Lightning Protection
- Custom Cable Lengths
KPSI 500 Applications
- Well Monitoring
- Down Hole
- Level Monitoring
- Ground Water Monitoring
- Tank Level
- Surface Water Monitoring
- Oceanographic Research
- Dewatering
- Reservoirs
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The KPSI 500 is intended for applications with requirements that include battery-powered operation with minimal current drain, low system cost, and use of a single recorder with multiple sensors “daisy-chained” on one cable. It will accommodate cable lengths between sensors and recorder up to 200 feet.
Able to operate from unregulated 12VDC power, each unit contains a microprocessor and EEPROM, which in addition to supporting the SDI-12 interface, are used to implement sophisticated compensation algorithms. This technique, combined with superior media-isolated sensing technology and proven packaging, results in a price/performance combination unmatched by any previous technique. The attached electrical cable is custom manufactured to Pressure Systems’ specifications and includes Kevlar® members to prevent errors due to cable elongation, and a unique water block feature that self-seals in the event of accidental cuts to the cable. Each transducer is shipped with our latest SuperDry™ Vent Filter that prevents moisture from entering the vent tube for at least one year without maintenance, even in the most humid environments.
The KPSI 500 is CE compliant to EN 61000-6-4:2001 and EN 61000-6-2:2001 and have an IP 68 and NEMA 6P housing protection rating. All KPSI Transducer calibrations are traceable to the National Institute of Standards and Technology (NIST).
Dated 04/09
| Parameter |
500
|
501
|
Units |
Comments |
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LEVEL RANGES
|
| Full Scale Level Ranges (1) |
10 thru 230
(3 thru 70)
|
10 thru 50
(3 thru 15)
|
ft H2O
(m H2O)
|
vented gage reference |
| Proof Pressure |
1.5 |
x FS |
|
| Burst Pressure |
2.0 |
x FS |
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STATIC PERFORMANCE
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| MEASUREMENT ACCURACY |
| Level |
±0.05
±0.10 |
N/A
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%FS TEB (2)
%FS TEB (2)
|
for level ranges > 10 ft (3 m) H2O
for level ranges <= 10 ft (3 m) H2O |
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N/A
|
±0.01
±0.1
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when reading <= 10 ft (3m) H2O
when reading > 10 ft (3m) H2O |
| Temperature |
±0.5
|
ºC
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| Excitation |
±0.5
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VDC
|
8 to 28 volts |
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MEASUREMENT RESOLUTION
|
| Level |
±0.0001 |
% FS |
|
| Temperature |
±0.001 |
ºC |
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| Excitation |
±0.1 |
VDC |
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ENVIRONMENTAL
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| Wetted Materials |
316 SS or Titanium; Delrin®,
polyurethane or Viton®
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Delrin® and Viton® are registered trademarks of DuPont. |
| Compensated Temp Range |
0 to 50 |
ºC |
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| Operating Temp Range |
-20 to 60
0 to 50
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ºC
ºC
|
when using polyurethane cable
when using ETFE cable (3)
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| Protection Rating |
IP 68, NEMA 6P
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ELECTRICAL
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| Excitation |
6 - 28 |
VDC |
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| Input Current |
8
11
0.5
|
mA
mA
mA |
average current during data acquisition
peak current during data acquisition for addressed sensor (~40mS duration)
Quiescent |
| Interface |
SDI-12
RS-485
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version 1.3 SDI-12 protocol |
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PHYSICAL
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| Approximate Weight |
0.75 (340)
0.05 (79)
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lbs (g)
lbs/ft (g/m) |
transducer
cable |
Cable
Jacket Material
Pull Strength
Number of Conductors
Conductor Size |
Polyurethane (std)
ETFE (4) (opt)
200 (90)
4
22
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lbs (kg)
AWG
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Tefzel®, Teflon® and Kevlar® are registered trademarks of DuPont. |
| Cable Seal |
Molded polyurethane
Viton® Gland
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for polyurethane cable
for ETFE cable |
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LIGHTNING PROTECTION (OPTIONAL) (5)
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| Life Expectancy |
> 1000 operations |
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| Peak Clamping Voltage |
36 volts
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| Response Time |
< 10 nsecs
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- Intermediate level ranges are available.
- Total error band includes the combined errors due to nonlinearity, hysteresis, nonrepeatability and thermal effects over the compensated temperature range per ISA S51.1.
- -20ºC to 50ºC for level ranges <= 100 ft (70m) H2O when using ETFE cable.
- ETFE is a fluoropolymer (Teflon® derivative) material, Tefzel® or equivalent.
- The power supply needs to be limited to 150 mA to avoid lock up of the gas tube after a suppression event.
Specifications subject to change without notice.