- Fillable: Yes
- Connection: 1/8 standard / 1/4 on request
- Case: 304 Stainless Steel Case
- Internals: 316 Stainless Steel
- Wetted Parts: 316 Stainless Steel
- Heavy Duty Connection, Socket and Bourdon Tube
- Accuracy: 1.5% ASME B40.1 Grade A
- Ranges: Up to 10,000 psi
- Mount: Standard Bottom Connection
- L-Center Back Connection
- P-Panel Mount / center back connection
- U-Panel Mount / center back u-clamp
- Scale: B=psi / Bar (dual scale)
- K-psi/kPa dual scale), psi/kg/cm2 (dual scale)
- McDaniel Model S
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- Fillable: Yes
- Connection: 1/4 standard
- Case: 304 Stainless Steel Case
- Internals: 316 Stainless Steel
- Wetted Parts: 316 Stainless Steel
- Heavy Duty Connection, Socket and Bourdon Tube
- Accuracy: 1.0% FULL SCALE ASME B40.1 Grade A
- Ranges: Up to 20,000 psi
- Mount: Standard Bottom Connection
- C-Center Back Connection
- P-Front Flange Panel Mount / lower back connection
- R-Rear Flange-(For wall mounting)
- U-Panel Mount / lower back u-clamp
- Scale: B=psi / Bar (dual scale)
- K-psi/kPa dual scale), psi/kg/cm2 (dual scale)
- McDaniel Model K
- Fillable: No
- Connection: 1/4 NPT
- Case: 304 Stainless Steel Case
- Internals: 316 Stainless Steel
- Wetted Parts: 316 Stainless Steel
- Heavy Duty Connection, Socket and Bourdon Tube
- Accuracy: 1/2% FULL SCALE ASME B40.1 Grade A
- Ranges: Up to 35,000 psi
- Mount: Standard Bottom Connection
- L-Lower back connection
- P-Front Flange Panel Mount / lower back connection
- R-Rear Flange (For wall mounting)
- U-Panel Mount / lower back u-clamp
- Scale: B=psi / Bar (dual scale)
- K-psi/kPa dual scale), psi/kg/cm2 (dual scale)
- McDaniel Model B
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Selecting a Pressure Gauge
When selecting a pressure gauge consideration should be given to a number
of parameters which have an effect on gauge accuracy, safety, and utility.
Accuracy required
Dial size
Operating pressure range
Chemical compatibility with gauge construction materials
Operating temperature range
Humidity
Vibration, pulsation, and shock
Pressure fluid composition
Method of mounting
Accuracy required
Engineering Consideration
System Design Requirements Specification - initial system engineered
design requirements will dictate the required pressure gauge
accuracy. Systems should be designed with cost and safety in mind.
Gauges which are more accurate generally cost more to build.
Selection Criteria
McDaniel Controls offers - pressure gauges with ranges of accuracy:
±.25%, ±.5%, ±1%, ±1.5%, ±2/1/2, ±3/2/3% and choice of scale from
inventory for many dual scale ranges, we offer more ranges and
special calibrations than any other manufacturer of gauges.
Pressure Gauge Accuracy for newly designed systems - should be
determined for each application and based on desired application
system operational characteristics. Operational parameters for many
process environments are often fine tuned after the process system
goes into production use. Accurate gauge readings are required to
maintain efficient process control.
Pressure Gauge Accuracy for replacement components - should be at
least equal to the gauge being replaced unless otherwise determined
by engineering review and in some cases with the component
manufacturer's approval. Selection of replacement gauges requires
careful consideration of all the gauge selection parameters reviewed
in this document and careful consideration and review of ASME
B40.1-1991, Gauges -- Pressure Indicating Dial Type -- Elastic
Element.)
Dial size
Engineering Consideration
Pressure Gauge Accuracy - determines dial size in two ways. First,
a requirement for higher accuracy dictates that a larger dial size
be available for display of small and readable pressure scale
increments. Second, by a requirement that the pressure gauge
user/operator be able to read the scale from a distance that
physical circumstances may dictate.
Selection Criteria
Pressure Gauge Range Selection - The pressure gauge selected should
have a dial size which permits the desired readable scale increments
from the operator required viewing distance. McDaniel Controls has
a wide range of dial sizes from 1½", 2", 2½", 4", 4½", and 6" dial
sizes (up to 20 inch dial size available).
Operating pressure range
Engineering Consideration
Overpressure Failure - is caused by the application of internal
pressure greater then the rated limits of the elastic element
(Bourdon Tube) and can occur when a gauge is subjected to pressures
greater than design limits.
Loss of gauge accuracy - occurs when a gauge has been subjected to
pressure exceeding design operation pressure limits. Loss of gauge
accuracy results from extending the elastic element (Bourdon Tube)
past its limit for elasticity.
Selection Criteria
Pressure Gauge Range Selection - The pressure gauge selected should
have a full scale pressure such that the operating pressure occurs
in the middle half (25% to 75%) of the scale(12 o'clock position is
best). The full scale pressure of the gauge selected should be
approximately two times the intended operating pressure. This will
give the operator a visual indication of normal, ideal operating
conditions. This means a "green light" condition and everything is
operating the way it should be. If however, the "visual" of the
pointer is way below or way above this 12 o'clock position, then we
have a situation that needs attention.
McDaniel Pressure Gauges - are designed and manufactured to minimize
failure and to protect personnel and property.
Chemical compatibility with gauge construction materials
Engineering Consideration
Corrosion Failure - occurs when the elastic element (Bourdon tube)
has been weakened through attack by the corrosive chemicals present
in either the media inside or the environment outside it. Failure
may occur as a pinhole leakage through the element walls or early
fatigue failure due to stress cracking brought about by chemical
deterioration or embrittlement of the material.
Selection Criteria
Chemical Compatibility Table - The Use of McDaniel Controls chemical
compatibility table can assist in selection of both gauge internals
and gauge case construction materials.
McDaniel Provided Diaphragm Seals - can be used to isolate gauge
internals from process fluids. McDaniel provided diaphragm seals
are engineered for reliable use with bourdon tube type pressure
gauges where separation of the medium and the control mechanism is
necessary. Seals are offered in a wide range of materials to
withstand corrosive conditions.
Diaphragm Seal Operation - The entire system above the diaphragm is
solidly filled with a suitable liquid. When line pressure is
applied, the diaphragm displacement builds an equal and balanced
pressure on the instrument side of the diaphragm, and the gauge then
measures line pressure. When properly filled, attached and
calibrated it allows the attached gauge to function very close to
its normal accuracy with only a slight accuracy loss through use of
a seal.
McDaniel Gauge Case Style - a wide range of case styles available
from McDaniel Controls provides opportunity to select a case that is
liquid fillable and constructed with materials resistant to external
attack by fumes and/or spillage of measured process media.
When selecting a pressure gauge consideration should be given to a number
of parameters which have an effect on gauge accuracy, safety, and utility.
Accuracy required
Dial size
Operating pressure range
Chemical compatibility with gauge construction materials
Operating temperature range
Humidity
Vibration, pulsation, and shock
Pressure fluid composition
Method of mounting
Accuracy required
Engineering Consideration
System Design Requirements Specification - initial system engineered
design requirements will dictate the required pressure gauge
accuracy. Systems should be designed with cost and safety in mind.
Gauges which are more accurate generally cost more to build.
Selection Criteria
McDaniel Controls offers - pressure gauges with ranges of accuracy:
±.25%, ±.5%, ±1%, ±1.5%, ±2/1/2, ±3/2/3% and choice of scale from
inventory for many dual scale ranges, we offer more ranges and
special calibrations than any other manufacturer of gauges.
Pressure Gauge Accuracy for newly designed systems - should be
determined for each application and based on desired application
system operational characteristics. Operational parameters for many
process environments are often fine tuned after the process system
goes into production use. Accurate gauge readings are required to
maintain efficient process control.
Pressure Gauge Accuracy for replacement components - should be at
least equal to the gauge being replaced unless otherwise determined
by engineering review and in some cases with the component
manufacturer's approval. Selection of replacement gauges requires
careful consideration of all the gauge selection parameters reviewed
in this document and careful consideration and review of ASME
B40.1-1991, Gauges -- Pressure Indicating Dial Type -- Elastic
Element.)
Dial size
Engineering Consideration
Pressure Gauge Accuracy - determines dial size in two ways. First,
a requirement for higher accuracy dictates that a larger dial size
be available for display of small and readable pressure scale
increments. Second, by a requirement that the pressure gauge
user/operator be able to read the scale from a distance that
physical circumstances may dictate.
Selection Criteria
Pressure Gauge Range Selection - The pressure gauge selected should
have a dial size which permits the desired readable scale increments
from the operator required viewing distance. McDaniel Controls has
a wide range of dial sizes from 1½", 2", 2½", 4", 4½", and 6" dial
sizes (up to 20 inch dial size available).
Operating pressure range
Engineering Consideration
Overpressure Failure - is caused by the application of internal
pressure greater then the rated limits of the elastic element
(Bourdon Tube) and can occur when a gauge is subjected to pressures
greater than design limits.
Loss of gauge accuracy - occurs when a gauge has been subjected to
pressure exceeding design operation pressure limits. Loss of gauge
accuracy results from extending the elastic element (Bourdon Tube)
past its limit for elasticity.
Selection Criteria
Pressure Gauge Range Selection - The pressure gauge selected should
have a full scale pressure such that the operating pressure occurs
in the middle half (25% to 75%) of the scale(12 o'clock position is
best). The full scale pressure of the gauge selected should be
approximately two times the intended operating pressure. This will
give the operator a visual indication of normal, ideal operating
conditions. This means a "green light" condition and everything is
operating the way it should be. If however, the "visual" of the
pointer is way below or way above this 12 o'clock position, then we
have a situation that needs attention.
McDaniel Pressure Gauges - are designed and manufactured to minimize
failure and to protect personnel and property.
Chemical compatibility with gauge construction materials
Engineering Consideration
Corrosion Failure - occurs when the elastic element (Bourdon tube)
has been weakened through attack by the corrosive chemicals present
in either the media inside or the environment outside it. Failure
may occur as a pinhole leakage through the element walls or early
fatigue failure due to stress cracking brought about by chemical
deterioration or embrittlement of the material.
Selection Criteria
Chemical Compatibility Table - The Use of McDaniel Controls chemical
compatibility table can assist in selection of both gauge internals
and gauge case construction materials.
McDaniel Provided Diaphragm Seals - can be used to isolate gauge
internals from process fluids. McDaniel provided diaphragm seals
are engineered for reliable use with bourdon tube type pressure
gauges where separation of the medium and the control mechanism is
necessary. Seals are offered in a wide range of materials to
withstand corrosive conditions.
Diaphragm Seal Operation - The entire system above the diaphragm is
solidly filled with a suitable liquid. When line pressure is
applied, the diaphragm displacement builds an equal and balanced
pressure on the instrument side of the diaphragm, and the gauge then
measures line pressure. When properly filled, attached and
calibrated it allows the attached gauge to function very close to
its normal accuracy with only a slight accuracy loss through use of
a seal.
McDaniel Gauge Case Style - a wide range of case styles available
from McDaniel Controls provides opportunity to select a case that is
liquid fillable and constructed with materials resistant to external
attack by fumes and/or spillage of measured process media.
Operating temperature range
Engineering Consideration
Loss of Gauge Accuracy - temperature change effects the stiffness of
the elastic element (Bourdon Tube). A change in the bourdon tube
stiffness will effect gauge accuracy.
Explosive Failure - for brass gauges in particular, solder is used
to seal the ends of bourdon tubes. Loss of solder seal can occur if
the gauge is subjected to temperatures near the solder melting
point. Loss of solder seal would allow media to enter the pressure
gauge case and possibly lead to explosive failure.
Leakage Past Gauge Case Seal - can result from exposing the gauge
case to elevated temperatures which may bake the seal and cause the
seal to loss its elasticity.
Selection Criteria
McDaniel provided guidelines - for high temperature gauge use can be
referred to when high temperatures or extreme environments are
expected.
Mounting Options - are important when consideration is given to use
of a siphon or pigtail which can trap condensed steam or other vapor
to isolate the gauge from the heat source. Use of a siphon, or
pigtail, makes a liquid seal in the line to the gauge and prevents
the high temperature from reaching the gauge internals.
McDaniel Provided Diaphragm Seals - are another option to stem flow
of measured media to the bourdon tube measuring element.
Humidity
Engineering Consideration
Loss of Gauge Accuracy - condensation inside pressure gauge lens can
make the gauge hard or impossible to read.
Selection Criteria
McDaniel Designed Liquid-Fillable gauges - All McDaniel Gauges are
designed to avoid formation of condensation inside the gauge lens.
In environments where humidity and moisture are still a problem,
McDaniel Controls liquid-fillable gauges are an excellent solution.
Glycerin or other choice of fillings prevent moisture from entering
the case body and condensing on the inside of the case lens. An
added benefit of a liquid-filled pressure gauge is extended gauge
life due to reduction of wear to the movable gauge internal parts.
[back to top]
Vibration, pulsation, and shock
Engineering Consideration
Vibration Failure - the most common mode of vibration failure is
that where the movement parts wear because of high cyclic loading
caused by vibration, resulting in gradual loss of accuracy, and,
ultimately failure of the pointer to indicate and pressure change.
Vibration-Induced Fatigue Failure - vibration may in some instances,
result in high loading of various parts of the pressure element
assembly. This loading could cause cracks in the element itself, or
in joints. Case pressure buildup may be slow, but it is possible
that a large hole may suddenly develop, with a high rate of case
pressure rise, which could result in a failure similar to an
explosive failure.
Selection Criteria
McDaniel Designed Liquid-Fillable gauges - are used for applications
involving vibration or pulsation. Glycerin is an excellent damper
of bourdon tube movement. Emersion of the entire assembly in a
protective liquid envelope provides lubrication and shuts out
corrosive or dirty atmospheres -- thereby minimizing wear of moving
parts and prolonging gauge life significantly. McDaniel Controls
gauges can be filled with Glycerin, Silicone, or fluorolube,
depending on application needs. See choice of fillings.
McDaniel provided pulsation snubbers - are used to minimize effects
from pulsation and surges. The snubber helps keep accurate data
flowing by dampening pulsation and surges. Gauge life is also
extended by reducing gauge wear.
Mounting Options - may become an important consideration for
elimination of mechanical vibration between mechanical equipment and
the pressure gauge. In some cases it may be appropriate to connect
the pressure gauge to the mechanical device using flexible hose and
tubing so that equipment mechanical vibration is dampened by
structural components. McDaniel Controls offers a wide range of
dial sizes, mounting options, and case styles to fit customer gauge
mounting needs.
Pressure fluid composition
Engineering Consideration
Pressure Gauge Accuracy - can be degraded when the measured media
contains high solids or is such that the measured media changes
between states of gas, liquid, or solid, due to varying process
temperature and media chemical compositions. Measured media solids
can restrict flow of the media to the elastic measuring element
(Bourdon tube) or completely block flow. Consequences of such loss
of accuracy may be a pressure gauge which stops responding to
pressure changes or is slow or sporadic in response to pressure
changes in the measured media.
Selection Criteria
McDaniel provided diaphragm seals - are engineered to prevent mixing
of the measured media with liquid used to transmit diaphragm seal
pressure to the Bourdon tube. Use of diaphragm seals are
recommended where there is a possibility of problems with process
media solids or process media change of state.
Method of mounting
Engineering Consideration
Vibration Control - can be achieved by remote mounting of gauges
monitoring equipment with high levels of mechanical vibration.
Available Structure and Design - available building structure and
system design presents a need for variable mounting requirements and
case styles.
Selection Criteria
McDaniel designed pressure gauges - offers a wide range of NPT sizes
and case mounting styles as follows:
NPT - 1/8", 1/4", 1/2" NPT
Other connection sizes available
1/4" MPF, 1/4" MPM, 1/4" HPF,
7/16 S.A.E., 9/16" MPM, 9/16" HPM
Mounting Styles
Standard Bottom Connection
Center Back or Lower Back Connections
Panel Mount (Center and Lower Back Connections)
U-Clamp Center Back
Front Flange (Center or Lower Back Connection)
Rear Flange (Bottom or Lower Back Connection)
Engineering Consideration
Loss of Gauge Accuracy - temperature change effects the stiffness of
the elastic element (Bourdon Tube). A change in the bourdon tube
stiffness will effect gauge accuracy.
Explosive Failure - for brass gauges in particular, solder is used
to seal the ends of bourdon tubes. Loss of solder seal can occur if
the gauge is subjected to temperatures near the solder melting
point. Loss of solder seal would allow media to enter the pressure
gauge case and possibly lead to explosive failure.
Leakage Past Gauge Case Seal - can result from exposing the gauge
case to elevated temperatures which may bake the seal and cause the
seal to loss its elasticity.
Selection Criteria
McDaniel provided guidelines - for high temperature gauge use can be
referred to when high temperatures or extreme environments are
expected.
Mounting Options - are important when consideration is given to use
of a siphon or pigtail which can trap condensed steam or other vapor
to isolate the gauge from the heat source. Use of a siphon, or
pigtail, makes a liquid seal in the line to the gauge and prevents
the high temperature from reaching the gauge internals.
McDaniel Provided Diaphragm Seals - are another option to stem flow
of measured media to the bourdon tube measuring element.
Humidity
Engineering Consideration
Loss of Gauge Accuracy - condensation inside pressure gauge lens can
make the gauge hard or impossible to read.
Selection Criteria
McDaniel Designed Liquid-Fillable gauges - All McDaniel Gauges are
designed to avoid formation of condensation inside the gauge lens.
In environments where humidity and moisture are still a problem,
McDaniel Controls liquid-fillable gauges are an excellent solution.
Glycerin or other choice of fillings prevent moisture from entering
the case body and condensing on the inside of the case lens. An
added benefit of a liquid-filled pressure gauge is extended gauge
life due to reduction of wear to the movable gauge internal parts.
[back to top]
Vibration, pulsation, and shock
Engineering Consideration
Vibration Failure - the most common mode of vibration failure is
that where the movement parts wear because of high cyclic loading
caused by vibration, resulting in gradual loss of accuracy, and,
ultimately failure of the pointer to indicate and pressure change.
Vibration-Induced Fatigue Failure - vibration may in some instances,
result in high loading of various parts of the pressure element
assembly. This loading could cause cracks in the element itself, or
in joints. Case pressure buildup may be slow, but it is possible
that a large hole may suddenly develop, with a high rate of case
pressure rise, which could result in a failure similar to an
explosive failure.
Selection Criteria
McDaniel Designed Liquid-Fillable gauges - are used for applications
involving vibration or pulsation. Glycerin is an excellent damper
of bourdon tube movement. Emersion of the entire assembly in a
protective liquid envelope provides lubrication and shuts out
corrosive or dirty atmospheres -- thereby minimizing wear of moving
parts and prolonging gauge life significantly. McDaniel Controls
gauges can be filled with Glycerin, Silicone, or fluorolube,
depending on application needs. See choice of fillings.
McDaniel provided pulsation snubbers - are used to minimize effects
from pulsation and surges. The snubber helps keep accurate data
flowing by dampening pulsation and surges. Gauge life is also
extended by reducing gauge wear.
Mounting Options - may become an important consideration for
elimination of mechanical vibration between mechanical equipment and
the pressure gauge. In some cases it may be appropriate to connect
the pressure gauge to the mechanical device using flexible hose and
tubing so that equipment mechanical vibration is dampened by
structural components. McDaniel Controls offers a wide range of
dial sizes, mounting options, and case styles to fit customer gauge
mounting needs.
Pressure fluid composition
Engineering Consideration
Pressure Gauge Accuracy - can be degraded when the measured media
contains high solids or is such that the measured media changes
between states of gas, liquid, or solid, due to varying process
temperature and media chemical compositions. Measured media solids
can restrict flow of the media to the elastic measuring element
(Bourdon tube) or completely block flow. Consequences of such loss
of accuracy may be a pressure gauge which stops responding to
pressure changes or is slow or sporadic in response to pressure
changes in the measured media.
Selection Criteria
McDaniel provided diaphragm seals - are engineered to prevent mixing
of the measured media with liquid used to transmit diaphragm seal
pressure to the Bourdon tube. Use of diaphragm seals are
recommended where there is a possibility of problems with process
media solids or process media change of state.
Method of mounting
Engineering Consideration
Vibration Control - can be achieved by remote mounting of gauges
monitoring equipment with high levels of mechanical vibration.
Available Structure and Design - available building structure and
system design presents a need for variable mounting requirements and
case styles.
Selection Criteria
McDaniel designed pressure gauges - offers a wide range of NPT sizes
and case mounting styles as follows:
NPT - 1/8", 1/4", 1/2" NPT
Other connection sizes available
1/4" MPF, 1/4" MPM, 1/4" HPF,
7/16 S.A.E., 9/16" MPM, 9/16" HPM
Mounting Styles
Standard Bottom Connection
Center Back or Lower Back Connections
Panel Mount (Center and Lower Back Connections)
U-Clamp Center Back
Front Flange (Center or Lower Back Connection)
Rear Flange (Bottom or Lower Back Connection)
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- Fillable: No
- Connection: 1/4 NPT or metric
- Case: Fiberblass reinforced thermoplastic
- Internals: 316 Stainless Steel
- Wetted Parts: 316 Stainless Steel (C Form
600PSI & below) (Spiral 800 PSI & Above) - Accuracy: 0.5% FULL SCALE ASME B40.
1 Grade 2A - Ranges: Vacuum, Rec, Compound, 0-
20,000 psi - Mount: Standard Bottom Connection
- Scale: B=psi / Bar (dual scale)
- K-psi/kPa dual scale), psi/kg/cm2 (dual
scale) - McDaniel Model MPB/SA
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