Series |
N/A 788 |
Type |
N/A Purge Control Level Transmitter |
Temperature [Min] |
N/A -16 ºC0 ºF |
Temperature [Max] |
N/A 54 ºC120 ºF |
Range of Adjustment |
N/A 0 to 277 inH2O through 0 to 830 inH2O, 0 to 7.0 mH2O 0 to 21.0 mH2O |
Transmitter Turndown Ratio |
N/A 3:1 |
Note for Span Adjustment Range |
N/A IMPORTANT! Accuracy, linearity, and non-repeatability values are based on nominal range. |
Materials of Construction |
N/A Machined brass body with acrylic semi-gloss enamel finish; integral filter element is aluminum with acrylic semi-gloss enamel finish. |
Fittings |
N/A None, 1/4 in. National Pipe Thread (NPT) |
Accuracy |
N/A ± 0.22% Full Scale |
Thermal Effects (Over Compensated Temperature Range) |
N/A
Less than 0.007% ºF (0.011% ºC) Span Shift-Sensitivity Less than 0.007% ºF (0.011% ºC) Span Shift-Zero |
Depth Measurement [Max] |
N/A 1,937 inH2O49.0 mH2O |
Electronic 4 to 20 Milliampere (mA) Output |
N/A D/P Purge Control or D/P LiquiSeal™ transmitter provides a 4-20 mA output over a two wire cable to an indicator or the analog I/O of a PLC. Using twisted pair shielded cabling permits transmission distances of several thousand feet to a remote receiver. |
Power Supply Stability (Effect on Free-Space Optical Communication (FSO)) |
N/A Less than 0.005% of Span Change in Output Per Volt Change at Input Terminals |
Output Signal (Milliampere Direct Current (DC) (mAdc)) |
N/A 4 to 20 mA |
Direct Current (DC) Power Supply Voltage (Unregulated) |
N/A 14 to 40 V |
Repeatability |
N/A ± 0.20% of Calibrated Span |
Flow Rate (Air Purge) |
N/A
Nominal 1 cfh (Cubic Feet Per Hour) at Specified Differential Maximum Air Consumption Under 5 cfh (Cubic Feet Per Hour). |
Voltage/Load Capacity Ratings |
N/A The KING-GAGE® D/P Transmitter requires a source of DC power for operation. The minimum excitation voltage necessary for the transmitter is 10 Vdc. Any receiving components (meters, data recorders, programmable controllers, etc.) installed in the process loop circuit must be taken into account when determining the required power supply voltage. The internal resistance of each device added together represents the total “load" residing on the circuit loop. |
Nominal Span Adjustment Range |
N/A 0 to 30 psid |
Span Adjustment Range [Min] |
N/A 0 to 10 psid |
Pressure [Max] |
N/A 300% Over-Range |
Burst Pressure |
N/A 200 psig |
Pressure Range |
N/A 0 to 30 psid |
Compressed Air Requirement |
N/A 35 psig to 150 psig supply pressure at control inlet. (Minimum supply pressure should be at least 20 psig greater than anticipated maximum liquid head pressure.) |
Operating Limit (Maximum Pressure) |
N/A
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. Indication is then provided directly as the total weight or volume of liquid in the tank. |
Differential Pressure Purge Control |
N/A Unit incorporates differential air flow regulator with flow control orifice. Fixed differential set to nominal 10 psid. Output is 1:1 pneumatic pressure (hydrostatic force equivalent). Includes an integral differential pressure (D/P) transmitter converting pneumatic pressure into 4 mAdc to 20 mAdc electronic output. |
Pressure to Milliampere (mA) Conversion |
N/A
KING-GAGE® D/P Transmitters accept either gage or differential pressure pneumatic inputs that are converted to a proportional 4-20 mA output signal. This two wire signal loop is compatible with typical process components that accept analog input including PLCs. Designed to operate over a broad voltage range, these transmitters work with power sources ranging from 14-40 Vdc (based on load requirements). Output current limiting and continuous no-load operation ensures reliability in even the most demanding situations. Isolated test meter terminals permit in-process monitoring for troubleshooting. This allows the user to easily check the transmitter output without having to remove it from the process loop circuit. |
Pressure Ranges are Span Adjustable |
N/A Transmitter span accommodates a 3:1 turndown ratio (3:1 turndown ratio is applicable to 0-10 and 0-30 nominal range, refer to specifications for detailed span adjustment available on specific range models.) to match the application pressure range (i.e., tank depth). This permits ranging of the device to provide full scale output for maximum resolution in process control operations. Individual transmitter ranges of 0-5 through 0-50 psid are offered. These yield far greater stability than comparable single range units requiring high turndown ratios to fit the application. |
SafeGard Option |
N/A A precision pneumatic control valve which will instantly close bubble-tight when subjected to a pre-set pressure. It is used to prevent over pressuring an indicator. |
LiquiSeal™ Purge Control Service Parts |
N/A
9316-4: O-ring for D/P top plate 7334-2: Safegard Service Kit 7334-19: Air Control Service Kit 7333-10: Replacement Filter Element Kit |
Differential Pressure Purge Calibration Kit |
N/A TL-190: Differential Calibration Kit |
Downpipe Check Valve |
N/A
Downpipe Check Valve 6363: Downpipe float check valve, 3/4" NPT connections 6563-10: Downpipe float check valve, 3/4" NPT outlet, 3/8" tube inlet
Material: 304 Stainless Steel, Nylon (float), FKM (seals) Maximum Pressure: 150 psig Inlet/Outlet: 3/4" NPT-female Weight: 1.2 lb (0.5 kg) |
Tank Top Fittings |
N/A
1-1/2" NPT Tank Top Fitting (for 3/4" Pipe) single purge line connection with tube fitting 7746-13: Carbon Steel, polyflo 3/8" tube 7746-15: Carbon Steel, Swagelok 3/8" tube 7746-18: 316 Stainless Steel, Swagelok 3/8" tube 1-1/2" NPT Tank Top Fitting (for 3/4" Pipe) with single 1/4" NPT purge port connection 2000FA: Carbon Steel 2000PA: PVC 2000SG: 316 Stainless Steel 1-1/2" NPT Tank Top Fitting (for 3/4" Pipe) with two 1/4" NPT purge/equalizer connection 2000FA-2: Carbon Steel 2000PA-2: PVC 2000SG-2: 316 Stainless Steel |
Downpipe Level Sensor |
N/A
When purged with compressed air, liquid within the downpipe is displaced by air pressure equal to the hydrostatic force of liquid in the tank. If carefully regulated at a low rate of flow, air pressure will constantly maintain equilibrium against the force of the liquid. Air escapes out through the bottom of the pipe unless needed to increase pressure as liquid force (depth) increases. The primary sensor element is typically 3/4 in. diameter pipe purchased from a local source. Always select piping material for compatibility with the tank contents. Downpipe purge systems can be used to measure virtually any type of liquid product including resins, asphalt or corrosive materials. Output is proportional to liquid depth and can be transmitted as an electronic 4-20 mA signal or pneumatically as a direct 1:1 pressure signal. |
LiquiSeal™ Purge Control |
N/A
LiquiSeal™ D/P purge control is a fully integrated air purge regulator and level transmitter. Operation is based on the control regulating a continuous 1 cfh (cubic foot per hour) flow of compressed air into the tank downpipe. An internal differential pressure sensor element converts resulting pressure into a 4-20 mAdc two wire signal. An all-pneumatic version of the LiquiSeal™ purge control is available. It provides a 1:1 pressure signal to a compatible indicator or external transducer through 1/4 in. airline tubing. All LiquiSeal™ purge controls feature an internal isolation diaphragm. Backpressure created by the continuous purging of the downpipe is applied to this internal diaphragm. Working as a pneumatic transmitter, an equivalent pressure is generated on the gauge side of the diaphragm. This process effectively isolates downstream components from contact with the liquid or vapor releases. |
Pneumatic Output Signal |
N/A Purge Control or LiquiSeal™ Control provides air pressure signal to an external transmitter or compatible indicator (with integral transducer). Typically, 1/4" poly or soft copper tubing is used to convey the pressure signal up to 1000 feet from the tank. |
Downpipe Liquid Level Sensor |
N/A Control regulates compressed air flow to pipe extending down toward tank bottom. Depth of liquid causes air pressure to increase or decrease proportionally. A differential pressure (D/P) transmitter provides a 4-20 mA signal that can be used for remote indication or process control functions. |
Pneumatic Output to Indicator |
N/A Purge Control continuously purges tank downpipe and creates pressure corresponding to hydrostatic head of liquid. This pressure signal is conveyed through 1/4 in. airline tubing to a compatible electronic or pneumatic column indicator. |
Electronic Output to Indicator |
N/A D/P Purge Control senses hydrostatic pressure due to liquid depth and transmits a proportional 4-20 mA output. KINGGAGE indicator correlates level to tank geometry to display actual volume amount (or weight) of liquid in tank. |
Hazardous Zone Service |
N/A The downpipe sensor and pneumatic components are fully compatible with explosion hazard environments. This makes pneumatic the sensible alternative for hazardous areas without the cost and complications of intrinsic safety barriers or explosion-proof products. Assumes only pneumatic components are situated in explosion hazard zone. |
Differential Pressure Pneumatic Sensor Controls |
N/A
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. |
Transmitter Signal Loop |
N/A
As is typical of two wire transmitters, electrical power to the signal loop is supplied through twisted pair cable. Excitation voltage (+V) is provided by the receiving device or from a separate Vdc power supply installed in the loop. The actual voltage necessary for operation of the system will depend upon the overall load resistance of the loop. In most applications, the KING-GAGE® Digital Indicator or LevelBAR indicator provides 24 Vdc excitation to power the transmitter signal loop. |
Application |
N/A
|
Tank Gauging Applications |
N/A
A complete tank level gauging system can be configured using either pneumatic Purge Controls or D/P Purge Controls. The output signal can be routed to either a analog column display or digital readout. Acting on the force balance principle, a pneumatic sensor generates air pressure equivalent to the hydrostatic force created by liquid depth. This pneumatic pressure is directed into the D/P transmitter. Pressure is converted to an electronic 4-20 mAdc output proportional to liquid depth. Twisted pair cabling is used to form the signal loop through which the remote indicator receives the transmitter output. The KING-GAGE® indicators shown in these system views correlate the transmitter output to total volume or weight of tank contents. This is determined by using a pressure versus capacity listing corresponding to the actual tank dimensions. |
Additional Information |
N/A
Purge Controls
D/P Sensor Control
|
Product Warranty |
N/A
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. |
Prop 65 Warnings |
N/A
 WARNING: This product can expose you to chemicals including Lead and Nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov |
