868-19-108

868-D/P Sensor Control (Air Flow Control)

Sensor Control Level Transmitter

0 to 83 inH₂O through 0 to 138 inH₂O, 0 to 2.1 mH₂O 0 to 3.5 mH₂O

± 0.34% Full Scale

None, 1/4 in. National Pipe Thread (NPT)

± 0.2% Full Scale (± 0.10% Full Scale, Typical) Includes Non-Linearity, Hysteresis and Non-Repeatability

Less than 0.007% ºF (0.011% ºC) Span Shift - Sensitivity
Less than 0.007% ºF (0.011% ºC) Span Shift - Zero

1,937 inH₂O

Less than 0.005% of Span Change in Output Per Volt Change at Input Terminals

4 to 20

14 to 40 V

± 0.20% of Calibrated Span

0 to 5 psid

200 psi

0 to 5 psid

35 psid to 150 psig Supply Pressure at Control Inlet

Pressure above 300% nominal range (overrange) will result in damage to the transmitter (200% may cause a shift in calibration). Burst pressure is 200 psi and will cause catastrophic and physical failure of the pressure element.

7333-10: Replacement filter element
7334-2: SafeGard service kit
7334-9: Air control section kit
7879-20: Vent generator
9316-4: O-ring for D/P top plate (868)

32 to 120 ºF 0 to 54 ºC

The KING-GAGE® D/P Transmitter is also offered in a hybrid version combined with an air flow control for pneumatic sensors or downpipe (bubbler) systems. These combination units allow for direct 4-20 mA signal from the tank using the integrated differential pressure transmitter.

D/P Sensor Controls are designed for use with KING-GAGE® pneumatic diaphragm sensors. The air control portion of these units creates a 1:1 pneumatic pressure directly proportional to liquid depth in the tank. Acting as a force balance, the pneumatic pressure offsets the hydrostatic pressure exerted against a diaphragm at the tank. The electronic transmitter then converts this pressure into a 4-20 mA output signal.

D/P LiquiSeal Controls and D/P Purge Controls are used in conjunction with a downpipe (or bubble tube) extending down through the liquid contents of the tank. This type of sensor also acts as a force balance. A continuous purge of compressed air into the pipe displaces the liquid and creates a pneumatic pressure equivalent to hydrostatic head pressure. The transmitter converts this pressure into a 4-20 mA output signal.

• Piezoresistive element for less frequent recalibration
• 4 mA to 20 mA two wire output for monitoring or control
• Better than ±0.02% span repeatability

Liquid level gauging demands a high degree of accuracy and repeatability. This is especially true for quality control in batch processing operations. That is why KING-GAGE® D/P Transmitters are specifically designed to provide optimal performance in tank gauging applications. They utilize a precision piezoresistive sensor element that provides longer term stability. Guaranteed accuracy is within ± 0.2% F.S. and repeatable to within ± 0.02% of calibrated span.

All KING-GAGE®, a NOSHOK Company products are guaranteed to be free from defects in material and workmanship for one (1) year from the date of purchase.

Repair Services Warranty: 90 days limited warranty.

Unit includes (1) water-resistant Hubbell cord grip.