• Non-Fouling Level Transducer

Non-Fouling Level Transducer

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  • Custom Level Ranges up to 700 ft (210 m) H2O
  • Accuracy to ±0.05% FS Available
  • Analog Outputs of 4-20 mA or VDC
  • Welded 316 SS or Titanium Construction
  • Optional Lifetime Lightning Protection
  • Optional Temperature Measurement Output
  • Custom Cable Lengths


  • Well Monitoring
  • Lift Stations
  • Slug Tests
  • Level Control
  • Ground Water Monitoring
  • Pump Control
  • Oceanographic Research
  • Surface Water Monitoring
  • Soil Remediation
The Series 700 family of submersible hydrostatic level transducers is specifically designed to meet the rigorous environments encountered in liquid level measurement and control. They can be configured to perform to specifications under most adverse, reactive conditions.

All KPSI Transducers utilize a highly accurate pressure sensor assembly specifically designed for hostile fluids and gases. The assembly is integrated with supporting electronics in a durable waterproof housing constructed of 316 stainless steel or titanium. 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.

These units are designed for installation in a Class I, Division 1, Groups A, B, C, and D, Class II, Division 1, Groups E, F and G, Class III, Division 1 hazardous location when connected to appropriate apparatus such as those manufactured by R. G. Stahl, Inc., and others. KPSI transducers are type approved by the American Bureau of Shipping (ABS) and are UL, CUL, and FM approved and have a IP 68 and NEMA 6P housing protection rating. The Series 700 is CE compliant to EN 61000-6-4:2001 and EN 61000-6-2:2001. All KPSI Transducer calibrations are traceable to the National Institute of Standards and Technology (NIST).


Level Ranges
Full Scale
Level Ranges2
5 thru 700
(1.5 thru 210)
2.3 thru 700
(0.70 thru 210)
ft H2O
(m H2O)
for vented
gage reference
N/A35 thru 700
(10 thru 210)
10 thru 700
(3 thru 210)
ft H2O
(m H2O)
for vented
gage reference
N/A35 thru 700 (10 thru 210)ft H2O
(m H2O)
for vented
gage reference
Proof Pressure1.5x FS 
Burst Pressure2.0x FS 
Static Performance
Static Accuracy3±0.05±0.10±0.25±0.50±1.00±FSOBFSL method
Wetted Materials316 SS or Titanium; Delrin®;
polyurethane or Viton®
 Delrin® and Viton® are registered
trademarks of DuPont
Temp Range
0 to 50°C 
Thermal Error4±0.055%FSO / °CWorst case over compensated
temperature range
Temp Range
-20 to 60°CWhen using polyurethane cable
0 to 50°CWhen using ETFE cable11
Protecting RatingIP 68, NEMA 6P  
Excitation9 - 3012  |  2.5 - 10VDCfor mA, VDC
Input Current20  |  3.5mA maxfor mA output  |  VDC output
Output104 - 20  | 0 - 5mA | VDCOption available6
Zero Offset ±0.208  | <0.25mA | VDCfor mA output  |  VDC output
See Loop Resistance Diagram  |  20ohmfor mA output  |  VDC output
at 50 VDC
Circuit ProtectionPolarity, surge/shorted output  
0.44 (196)
0.05 (79)
lbs (g)
lbs/ft (g/m)
Jacket Material

Pull strength

Number of

Conductor Size

Polyurethane (std) ETFE9 (opt)

200 (90)



lbs (kg)

Tefzel®, Teflon® and Kevlar®
are registrated trademarks
of DuPont
Cable SealMolded Polyurethane
Viton® Gland
 for polyurethane cable
for ETFE cable
Temperature Output Option (Not Intrinsic Safety Approved)
-20 to 60°Cavailable for 4-20 mA
output version only
Output Signal164 - 20mA 
Lightning Protection (Optiomal)13
Life Expectancy>1000 operations  
Peak Clamping
36 Volts  
Response Time<10 nsecs  

1. For ranges > 230 ft (70 m) H2O, output is 4-20 mA only.
2. Intermediate level ranges are available.
3. Static accuracy includes the combined errors due to nonlinearity, hysteresis and nonrepeatability on a Best Fit Straight Line (BFSL) basis, at 25ºC per ISA S51.1.
4. Thermal error is the maximum allowable deviation from the Best Fit Straight Line due to a change in temperature, per ISA S51.1.
5. For ranges < 12 ft (4 m) H2O, maximum thermal error is ±0.1% FSO/ºC.
6. Custom VDC output levels can be provided up to 2.5 VDC less than the excitation supply voltage. Contact Customer Service for VDC output availability.
8. For ranges <= 5 ft (1 m) H2O, zero offset is ±0.25 mA.
9. ETFE is a fluoropolymer (Teflon® derivative) material, Tefzel® or equivalent
10. For ranges < 5 ft (1.5 m) H2O, only 4-20 mA output is available.
11. -20ºC to 50ºC for level ranges <= 100 ft (70m) H2O when using ETFE cable.
12. Intrinsic safety limits excitation to 28V.
13. The power supply needs to be limited to 150 mA to avoid lock up of the gas tube after a suppression event.


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