What kind of accuracy can I expect?

Accuracy may be expressed as either component accuracy or system accuracy. Individual components such as transmitters generally have accuracy expressed as ± % FS (percent of full scale or full range of the device). In the case of our ES2 liquid level transmitter, the accuracy specified is ± 0.20% FS.

Therefore . . .

  • 5 PSI range — 0.20% = within 0.01 psi or 0.27 in (6 mm) water depth
  • 10 PSI range — 0.20% = within 0.02 psi or 0.55 in (14 mm) water depth
  • 15 PSI range — 0.20% = within 0.03 psi or 0.83 in (21 mm) water depth
  • 30 PSI range — 0.20% = within 0.06 psi or 1.66 in (42 mm) water depth
  • 50 PSI range — 0.20% = within 0.10 psi or 2.76 in (70 mm) water depth

Generally speaking, KING-GAGE® systems that utilize pneumatic sensors (AcraSensor, TeleSensor,) or downpipe purge (LiquiSeal or Purge Control) have accuracy stated as ± 1/4 inch (± 6 mm) of liquid depth.

What range sensor do I need?

Rule of thumb uses the simple calculation based on maximum depth in inches. Multiply inches of depth by the specific gravity (where water is 1.00 sp. gr.) and divide by 27.68.

(inches of depth x specific gravity) divide by 27.68 = PSI

(meters of depth x specific gravity) divide by 0.703 = PSI

Can I shorten the cable on the sensor?

If possible, simply coil excess cable rather than trimming it. Previous Series 5700 KING-GAGE Electronic Sensors require positive venting through the cable assembly and must retain the watertight integrity to prevent damage to the internal electronics.

How do I adjust the span (or range) of the sensor?

  • ES2 Transmitters: span adjustment includes rotary switch setting for coarse range setting and fine span setting via potentiometer within the transmitter housing - please refer to product manual. (Some previous generation KING-GAGE Electronic Sensors are fixed range devices with less than 2% adjustment.)
  • D/P Transmitters: these pneumatic-to-current transmitters offer 3:1 turndown range for setting span. Use the span adjustment potentiometer (refer to EX-1673-2 service manual for details).
  • On air operated diaphragm sensors, range adjustment is only applicable to systems using D/P Sensor Controls or D/P Purge Controls.

How do I calibrate a KING-GAGE indicator?

Manometer type (fluid filled) gauges do not require calibration other than to check the level of indicating fluid with no pressure applied to the instrument. The procedure to replace the glass indicating tube is outlined in KING instruction manual EX-1524-10.

KING-GAGE electronic and digital instruments require factory service in the event they are no longer within specifications. (These include LP2 digital tank indicators, LevelBAR tank level indicators.)

Can equipment be returned to the factory for repair/refurbishment?

You may contact the factory sales/service office at orders@king-gage.com or phone 855.367.2494 to obtain a Return Material Authorization (RMA) number. Items must be shipped prepaid to the factory in Newell, WV U.S.A. We offer standard repair charges based on the type of component and can inform you of these charges in advance. Pre-approved repair orders (includes purchase order noting pre-approved charges) can greatly expedite this service. (Please refer to the RMA description provided on our website.)

What is the warranty?

New Products -- All King Engineering products are guaranteed to be free from defects in material and workmanship for one year from the date of purchase.

Repair Services Warranty -- 90 days limited warranty.



How do I know when it is time to replace filter elements?

Cartridges that have reached the end of effective service life will exhibit a higher pressure drop (15-25 psi) across the filter unit. Color-change polisher cartridges (Ultra-C Model U202/U203) will turn red when liquid airborne contaminant has saturated the cartridge signaling replacement. Generally speaking, cartridges should be replaced on regular periodic intervals (6 months, yearly, etc.) based on service conditions.

Do you have replacement cartridges for other manufacturer's filter housings?

No. Our cartridges are manufactured specifically for KING Filters (including Ultra-C models).

Can KING Filters be used for fluid applications?

No. KING Filters are specifically designed for cleaning compressed air or compressed gases only.



Pneumatic sensors listed in this catalog work on the force balance principle. Compressed air pressure is generated by the sensor to directly offset the hydrostatic pressure. This dynamic 1:1 balance between these two pressures (liquid and air) is functionally immune to temperature, hysteresis and long term drift.

Pneumatic components are fully compatible for use within continuous explosion hazard zones. An inert gas such as compressed nitrogen may be used when special considerations apply.

Compressed Air Supply (35 to 150 psig)

Recommended compressed air supply pressure required for system operation can be calculated as the maximum liquid pressure plus 20 psig. Calculate liquid pressure using formula listed below. Minimum supply pressure should not be less than 35 psig (241 kPa) nor greater than 150 psig (1034 kPa). All pneumatic instrumentation depends upon clean, dry and oil-free instrument grade air for optimal performance. Sub-micron, coalescing type filters should be installed upstream in the airline supplying the pneumatic components.

Actual air consumption is less than 0.16 scfm per unit.