The KOBOLD DPF76 is a stainless steel diaphragm pressure gauge for intermediate pressures, with an integral 316-Ti stainless steel diaphragm, a 304 stainless steel case, and ranges from -30 in Hg vacuum to 300 psig (20.7 bar). The all-stainless design is built for high corrosion resistance, with a 100 mm (4 inch) or 160 mm (6 inch) dial and an optional glycerin damped indicator.
How the DPF76 Diaphragm Pressure Gauge Works
An internal diaphragm is subjected to process pressure from one side. The pressure bends the diaphragm, and the indicator mechanism converts the resulting displacement into movement of the pointer. Because the diaphragm is securely clamped about its perimeter, the result is a very stable mechanical system, much less susceptible to vibration than a standard Bourdon tube gauge.
DPF76 Pressure Ranges and Accuracy
The DPF76 is offered in eight fixed ranges, from a -30 to 0 in Hg vacuum range up to 300 psig, with DIN class 1.6 accuracy and momentary overpressure protection of 1.3 times the range maximum. The range is selected by a three-character code in the model number and is available in both dial sizes, with or without glycerin damping.
- H00: -30 to 0 in Hg (-1.0 to 0 bar)
- 115: 0 to 15 psig (1.0 bar)
- 130: 0 to 30 psig (2.1 bar)
- 160: 0 to 60 psig (4.1 bar)
- 210: 0 to 100 psig (6.9 bar)
- 216: 0 to 160 psig (11.0 bar)
- 220: 0 to 200 psig (13.8 bar)
- 230: 0 to 300 psig (20.7 bar)
Materials of Construction
Wetted parts are the sensing element, in 316-Ti stainless steel and Duratherm, and the fitting, in 316-Ti stainless steel. On the exterior, the movement is stainless steel, the housing and bezel are 304 stainless steel, the pointer is black aluminum, the indicator dial is white aluminum, and the gauge window is instrument glass.
Process Connection, Dial Sizes, and Dimensions
The process connection is 1/2 in MNPT, located at the bottom of the gauge. Two dial sizes are available: the DPF76-1 with a 100 mm (4 inch) dial and the DPF76-2 with a 160 mm (6 inch) dial. Both share a 3.94 in (100 mm) diaphragm flange diameter.
- 4 inch dial: housing diameter 3.94 in (100 mm), overall height 4.92 in (125 mm), weight 2.1 lb (0.95 kg)
- 6 inch dial: housing diameter 6.30 in (160 mm), overall height 6.89 in (175 mm), weight 3.0 lb (1.36 kg)
Temperature Limits
The media temperature range runs from freezing to 176°F (80°C), and the ambient range is -4 to 176°F (-20 to 80°C). Mount the gauge so these limits are not exceeded. Temperature can influence display accuracy, so protect the gauge and stop valve with sufficiently long measurement piping or a water-bag pipe.
Glycerin Damped Indicator Option
Ordering code F adds a glycerin dampened indicator assembly. The filling is designed to help dampen the effects of machine vibration and pulsation of the media. Where pressure peaks are expected, a pressure peak suppressor or a glycerin filled gauge may be considered.
Media and Applications
KOBOLD diaphragm gauges are used for media where Bourdon tube or pneumatic capsule gauges are challenged. Because of the protective diaphragm seal design, the DPF76 is designed for use with viscous as well as corrosive fluids, and its stainless steel wetted parts are intended to provide chemical and corrosion resistance. The diaphragm element is also designed to tolerate crystal formation.
Installation and Commissioning
Install the DPF76 following the general technical regulations for pressure measuring devices, such as DIN 16255 or EN 837-2. When screwing in the connection, apply force only at the hexagonal wrench flats, never through the housing. Choose an accessible location close to the pressure tap and, if possible, above the measuring point.
Fit a shut-off device between the pressure tap and the gauge to allow replacement and a zero-point check on the running system. Piping should permit vibration-free attachment; otherwise provide a wall bracket or panel mounting. At commissioning, apply pressure slowly, never exceed the maximum permitted pressure, and check all piping for proper sealing. For the zero-point check, close the shut-off device and relieve the measuring element; the pointer must remain within the null-point tolerance bars printed on the scale.
Maintenance
With uncontaminated media, the DPF76 is maintenance-free. Examine the display about one to two times per year: separate the gauge from the process and apply a test pressure at an appropriate inspection temperature. Clean with a dry or soap-water dampened cloth.
DPF76 Ordering Information
A DPF76 model code combines dial size, range code, and the optional damping suffix: DPF76-1 (100 mm, 4 inch dial) or DPF76-2 (160 mm, 6 inch dial), then the range code, then F for the glycerin dampened indicator assembly. Example: DPF76-2130F is a 6 inch dial, 0 to 30 psig gauge with glycerin damping.
Common Questions about DPF76 - Stainless Steel Diaphragm Pressure Gauge
Eight ranges are available: a vacuum range of -30 to 0 in Hg, and gauge ranges of 0 to 15, 30, 60, 100, 160, 200, and 300 psig. Each range has its own code in the model number (H00, 115, 130, 160, 210, 216, 220, 230) and can be combined with either dial size.
The DPF76 is rated to DIN accuracy class 1.6 across all ranges. It can withstand momentary overpressure up to 1.3 times the maximum value of its range. At commissioning, pressure should be applied slowly and the maximum permitted pressure must never be exceeded.
Two parts touch the process: the sensing element, made of 316-Ti stainless steel paired with Duratherm, and the fitting, also 316-Ti stainless steel. These are the only wetted parts. The exterior parts, including the movement, housing, and bezel, are stainless steel as well.
Yes. Both the 4 inch DPF76-1 and the 6 inch DPF76-2 are supplied with a case and bezel made of 304 stainless steel. The movement is stainless steel too, so the exterior of either size is an all-stainless construction, matching the all-stainless design of the wetted parts.
The DPF76 has a 1/2 in MNPT bottom connection. During installation, tightening force must be applied only through the hexagonal wrench flats on the connection and never through the gauge housing. A sealing disc or sealing-edge ring is used to seal the connection.
Media temperature is limited to a range from freezing up to 176°F (80°C). Ambient temperature is limited to -4 to 176°F (-20 to 80°C). If the process runs hotter, a sufficiently long run of measurement piping or a siphon can be used to keep the gauge within its limits.
Specify ordering code F when the installation is exposed to machine vibration, media pulsation, or expected pressure peaks. A glycerin filled gauge is one of the protective measures that may be considered in those cases, alongside a pressure peak suppressor. The filling is available on every range and dial size.
The 4 inch version has a 3.94 in (100 mm) housing diameter, stands 4.92 in (125 mm) tall, and weighs 2.1 lb (0.95 kg). The 6 inch version has a 6.30 in (160 mm) housing diameter, stands 6.89 in (175 mm) tall, and weighs 3.0 lb (1.36 kg).
If the measured medium is not contaminated, no routine maintenance is required. An inspection of the display is recommended about one to two times a year: isolate it from the process line, then put test pressure on it at a suitable inspection temperature. Wipe the exterior clean with a dry cloth or one dampened in soap-water solution.
Product Specifications
Measuring Ranges
-30"Hg...300 PSIG
Product Features
St. Steel Wetted Parts for Corrosion Resistance
Suitable for Viscous Media
Tolerates Crystal Formation
Durable Diaphragm Element
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