The KOBOLD KPG is a high precision pressure transmitter designed for applications that require high accuracy. It uses diffused semiconductor or thin film sensing technology to measure gauge and absolute pressure, provides an optional accuracy of ±0.125% of full scale, and is built with 316 stainless steel wetted parts and a choice of output signals and electrical connections.
How accurate is the KPG high precision pressure transmitter?
The KPG offers a standard accuracy of ±0.25% of full scale and an optional accuracy of ±0.125% of full scale, expressed as best fit straight line. This figure includes the combined effects of non-linearity, hysteresis, non-repeatability, zero point, and full scale errors. Zero and span are adjustable within ±10% of full scale.
What pressure ranges does the KPG measure?
The KPG measures gauge pressure across ranges from -15 psi through 15,000 psi (1034 bar), and absolute pressure from 0 to 15 psia (1.03 bar) through 0 to 300 psia (20.7 bar). Overpressure protection is built in, with proof and burst limits that scale with the selected range.
What output signals and power does the KPG use?
The KPG is available with a 4-20 mA two-wire output or 0-5 VDC, 1-5 VDC, or 0-10 VDC three-wire outputs. Input power is 10-30 VDC for the 4-20 mA, 0-5 VDC, and 1-5 VDC versions, and 14-30 VDC for the 0-10 VDC version. Response time is under 1 ms across 10 to 90% of full scale.
What materials and connections are available?
The KPG measuring element is 316 stainless steel for ranges to 300 psig and 17-4PH stainless steel for ranges of 500 psig and above, while the connection and housing are 316 stainless steel. Process connections include 1/8 inch NPT, 1/4 inch NPT, 1/2 inch NPT, and a 7/16-20 SAE non-adjustable fitting.
Electrical connection choices include:
- Mini-Hirschmann mating connector (standard)
- Mini-Hirschmann with 1/2 inch NPT conduit
- Mini-Hirschmann with 36 inch polyurethane-clad cable
- 1/2 inch NPT male conduit with 36 inch polyurethane-clad cable
- 6-pin Bendix (nickel-plated aluminum)
- M12x1 (4-pin Micro DC)
- 3 ft cable
What are the operating conditions and protection ratings?
Media temperature ranges from -20°F to 212°F (-29°C to 100°C), the compensated range is 32°F to 175°F (0°C to 79°C), and ambient temperature ranges from -4°F to 175°F (-20°C to 79°C). The KPG carries an IP65 rating and built-in protection against reverse polarity, overvoltage, and short circuit.
The transmitter is designed to withstand 1000g shock (IEC 60068-2-27) and 20g vibration (IEC 60068-2-6). It is CE compliant to EMC norm EN 61326 with RFI, EMI, and ESD protection, and is rated for a service life of more than 100,000,000 load cycles. Each transmitter undergoes 100% inspection and testing to help support a trouble-free installation.
Where is the KPG pressure transmitter used?
The KPG is designed for use in:
- Hydraulic and pneumatic systems
- Industrial machinery and machine tools
- Injection molding machines
- Stamping and forming processes
- Pumps and compressors
- Laboratory and test equipment
- HVAC systems
- Refrigeration equipment
- Petrochemical applications
Common Questions about KPG - High Precision Pressure Transmitter
The KPG senses pressure with either a diffused semiconductor or a thin film element. The element converts applied pressure into a proportional signal, delivered as 4-20 mA or a DC voltage. A known pressure source and meter allow the zero and span potentiometers to be set during alignment.
Standard units provide ±0.25% of full scale accuracy, and an optional version reaches ±0.125% of full scale. Thermal drift is ±0.01% per °F (±0.018% per °C) for both zero and span. The rated accuracy already accounts for non-linearity, hysteresis, non-repeatability, and zero and span error.
The KPG provides a 4-20 mA two-wire signal or three-wire voltage signals of 0-5 VDC, 1-5 VDC, or 0-10 VDC. In the two-wire version, supply and output share the loop; in three-wire versions, separate supply, common, and output terminals serve the Hirschmann, cable, M12x1, and 6-pin Bendix connections.
The media temperature range is -20°F to 212°F (-29°C to 100°C). The compensated range, where the accuracy specification applies, is 32°F to 175°F (0°C to 79°C), and the ambient range is -4°F to 175°F (-20°C to 79°C). Storage temperature spans -40°F to 212°F (-40°C to 100°C).
The KPG measures up to 15,000 psi (1034 bar) gauge. Overpressure limits depend on the range: 0 to 2 psig through 0 to 200 psig withstand 3x proof and 5x burst; 0 to 300 psig through 0 to 10,000 psig withstand 2x proof and 4x burst; and the 0 to 15,000 psig range withstands 1.5x proof and 3x burst.
Housing, connection, and the standard measuring element use 316 stainless steel; on ranges of 500 psig and up, the element switches to 17-4PH stainless steel instead. Fittings include 1/8, 1/4, and 1/2 inch NPT plus a 7/16-20 SAE non-adjustable connection. The transmitter weighs about 7.5 oz (213 g).
The KPG requires no routine maintenance. Recalibration follows your facility quality assurance program; when no program is in place, a one-year cycle is recommended. To realign, apply a known pressure with a meter, set the zero potentiometer with no pressure applied, then set the span potentiometer at full scale.
The KPG can be mounted in any plane with negligible effect on performance, though installing it away from strong vibration is recommended. Always use a wrench on the wrench flats when tightening, and never use a pipe wrench on the housing or near the electrical connection.
A KPG order number combines codes for pressure range, accuracy (1 = ±0.25%, 2 = ±0.125%), output (1 = 4-20 mA, 2 = 0-5 VDC, 3 = 1-5 VDC, 5 = 0-10 VDC), fitting (1, 2, 8, 45), and electrical connection. Options include a surge damping orifice (D) and an extended cable (EC), available only with connection option 1 or 6.
Micro-DC connector cables for the M12x1 connection are offered in 6, 16, and 32 foot lengths. Glycerine-filled 316 stainless steel diaphragm seals are available in 1-1/2 inch and 2 inch Tri-Clamp and 3/4 inch NPT flush styles, for ranges of 60 psig and above with the 1/2 inch NPT fitting.
Product Specifications
Pressure Ranges
-15...15,000 PSIG
Fittings
1/8", 1/4" NPT, 1/2" NPT, or 7/16-20 SAE (Non-Adjustable)
Wetted Materials
316 Stainless Steel (measuring element ≤300 PSIG, connection, and housing); 17-4PH Stainless Steel (measuring element ≥500 PSIG)
Accuracy
± 0.25% of FS (Standard), ± 0.125% of FS (Optional)
Output
4-20 mA (Standard), 0-5 VDC, 1-5 VDC, 0-10 VDC
Product Features
Advanced Thin Film or Piezoresistive Sensing Technology
Variety of Output Signals
Absolute or Gauge Measuring Ranges
High Overpressure Protection
Easy-to Use Mini-Hirschmann Connector Standard
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