YAMATAKE-HONEYWELL KDP22Y-1122A4-67 WATER LEVEL TRANSMITTER KDP 23986 -1.5 0 1.5 KPA

The KDP22Y-1122A4-67 is a high-performance, compact Submersible Pressure Transmitter (also called a Level Transmitter) designed for continuous, accurate measurement of liquid level in water and other compatible liquids. It is part of Yamatake-Honeywell’s reliable KDP series, known for its robust construction and long-term stability in demanding environments like wells, tanks, reservoirs, and process water systems.

The key identifier KDP 23986 -1.5 0 1.5 on the label indicates its specific calibration range.

Detailed Product Description & Key Features

1. Core Function:

• Technology: Utilizes a piezoresistive silicon sensor to measure the hydrostatic pressure exerted by the liquid column above it.
• Principle: The pressure is directly proportional to the height of the liquid (level), corrected for the specific gravity of the liquid. The transmitter converts this pressure into a standardized 4-20 mA DC output signal.
• Mounting: Fully submersible. It is typically installed at a fixed point near the bottom of the vessel or body of water.

2. Model Code Breakdown (KDP22Y-1122A4-67):

• KDP22: Series designation for submersible level transmitters.
• Y: Output signal is 4 to 20 mA DC, 2-wire (loop-powered).
• 1122: This combination typically specifies the pressure sensor type, wetted materials (often stainless steel), and the basic performance class.
• A4: Indicates the cable length. “A4” commonly specifies a 4-meter integral vented cable. The cable is vented to allow atmospheric pressure reference for gauge pressure measurement.
• 67: Likely a regional or special option code. May indicate specific packaging, documentation, or a minor design revision.

3. Critical Calibration Data (KDP 23986 -1.5 0 1.5):

• KDP 23986: Probably the instrument’s unique serial or batch number.
• -1.5 0 1.5: This is the Range Setting in meters of water column (mH₂O). This indicates a Compound Range (also known as a “Below Atmospheric” or “Vacuum” range), essential for applications where the sensor might be installed below the zero-level datum point.
  • Lower Range Limit (LRV): -1.5 mH₂O
  • Upper Range Limit (URV): +1.5 mH₂O
  • Span: 3.0 mH₂O
  • Interpretation: This transmitter is calibrated to measure from 1.5 meters below its physical mounting point to 1.5 meters above it. This is common when the transmitter is installed in a pit or well sump below the lowest possible water level (e.g., a pump cut-off level). The 4 mA output corresponds to -1.5m, and the 20 mA output corresponds to +1.5m.

4. Typical Specifications:

• Power Supply: Standard 24 VDC (12-36 VDC typical for 2-wire loops).
• Output: 4-20 mA DC, linear to measured level.
• Accuracy: High, typically ±0.25% of span or better.
• Process Connection: Usually a suspended sensor with a stainless steel cable grip.
• Diaphragm Material: 316L Stainless Steel (standard).
• Cable Material: Polyurethane (PU) or similar, suitable for potable water.
• Temperature Compensation: Built-in for stable performance across varying ambient and process temperatures.

Typical Applications

• Groundwater level monitoring in wells and boreholes.
• Level control in water storage tanks and reservoirs.
• Pump control in lift stations and sumps.
• Process water level measurement in industrial plants.
• River, lake, or reservoir level monitoring.