User guide

American Sensor Technologies • 450 Clark Dr., Mt. Olive, NJ 07828 • phone [phone] • fax [phone] • email: [e-mail]
TM
Submersible Liquid Level Sensors
AST4500 AST4510
Applications
Ground Water Level 
Bio-Fuels 
Salt Water Holding Tanks 
Gasoline & Diesel Fuel Tanks 
Fertilizer Tanks 
Earthen & Concrete Dams 
Irrigation Equipment 
Ballast Tanks 
Oil Tanks 
Waste Water Canals 
Benefits
High Strength Stainless Steel Construction 
No Internal O-rings 
Wide Operating Temperature 
Pressures up to 100 PSI 
Low Static and Thermal Errors 
Unparalleled Price and Performance 
New Conduit Fitting at Electrical Connection 
Survives Harsh Environments 
Compatible with Wide Variety of Liquids 
EMI/RFI Protection 
ABS (American Bureau of Shipping) Approved 
The AST4500 and AST4510 submersible liquid level sensors are approved to UL/cUL913 (CSA 157)
Class I Div 1, Groups C and D for use in intrinsically safe areas with an approved barrier. It
is also certied for ATEX Class I Zone 0 Exia IIB T4 Ga (Ta = -40°C to +80°C). For pressure ranges
from 0-1 to 0-100 PSI that require a wide range of media compatibility, the submersible series is an
excellent solution to level monitoring for indoor and outdoor applications.
The AST4500 and AST4510 level sensors are completely sealed for submersion, yet vented through
the cable to correct for barometric pressure changes. The welded housing is tested in-house via a
helium leak tester to ensure proper protection. The conductors of the cable are also isolated from the
outside environment to keep the sensor operational for long-term use.
With a removable nose cone, the AST4500 and AST4510 series can be also be installed outside of the
tank through a 1/4” NPT pipe connection. In this conguration, the sensor continuously monitors the
tank level through a threaded connection outside the tank, yet remains fully submersible for applications
with ood prone environments or severe wash-down conditions. Available with voltage or 4-20mA output
signals, AST can provide a cost effective solution for level monitoring for a variety of applications.
Environmental Data
Temperature
Operating -40 to 80°C (-40 to 176°F)
Storage -40 to 100°C (-40 to 212°F)
Thermal Limits
Compensated Range 0 to 55°C (32 to 131°F)
TC Zero <±1.5% of FS (<±2.5%, typ. for 1PSI)
TC Span <±1.5% of FS (<±2.5%, typ. for 1PSI)
Other
Shock 100G, 11 msec, 1/2 sine
Vibration 10G peak, 20 to 2000 Hz.
EMI/RFI Protection: Yes
Rating: IP-68
Performance @ 25°C (77°F)
Accuracy* < ±0.25% BFSL (<±0.5% BFSL for 0-1 PSI)
Stability (1 year) ±0.25% FS, typical
Over Range Protection 2X Rated Pressure
Burst Pressure 5X or 1,250 PSI (whichever is less)
Pressure Cycles > 50 Million
Electrical Data
Output 4-20mA 1-5VDC
Excitation 10-28VDC 10-28VDC
Output Impedance >10k Ohms <100 Ohms, Nominal
Current Consumption: 20mA, typical <10mA
Bandwidth (-3dB): DC to 250 Hz (-3dB): DC to 1kHz
Output Noise: - <2mV RMS
Zero Offset: <±1% of FS (<±4% 1PSI) <±1% of FS (<±4% 1PSI)
Span Tolerance: <±2% of FS (<±4% 1PSI) <±1.5% of FS (<±4% 1PSI)
Output Load: 0-800 Ohms@10-28VDC 10k Ohms, min
Reverse Polarity Protection Yes Yes
For UL certied barrier
drawing, see A01657.
For CSA certied barrier
drawing, see A08949.