Faq

Ashcroft provides a standard certificate of conformance with each packing list, we also offer a signed certificate of conformance with added statements when requested by you, the customer. To order a signed certificate of conformance – please be sure you include the CD1A option with your part number.

A certified calibration certificate provides the user with a serial numbered instrument along with a calibration certificate that it has been calibrated/certified in accordance to the pressure instrument standards with instruments that are traceable to NIST. A certified calibration chart made per: ASME B40.100 2013 Pressure gauges & attachments. ASME B40.200 2008 Thermometers with masters traceable to NIST To order a certified calibration certificate – please make sure you have the XC4 option in your part number.

ISO/IEC 17025 accreditation is the single most important standard for calibration and testing laboratories around the world. ISO 17025 accredited laboratories have demonstrated that they are technically proficient and able to produce precise and accurate test and calibration data. This is a voluntary, third party-reviewed process that ensures a laboratory’s quality management system and is thoroughly evaluated on a regular basis to guarantee continued technical competence and compliance with ISO 17025. Laboratory accreditation bodies use the ISO 17025 standard specifically to assess factors relevant to a laboratory’s ability to produce precise, accurate test and calibration data, including: – Traceability of measurements and calibrations to national standards – Technical competence of staff – Maintenance of test equipment – Quality assurance of test and calibration data – Validity and appropriateness of test methods – Appropriate handling and transportation of test items – Quality of testing environment and sampling To ensure continued compliance, accredited laboratories are regularly re-assessed to check that they are maintaining their standard of technical expertise. These laboratories are also required to participate in regular proficiency testing programs as an ongoing demonstration of their competence.

ISO/IEC 17025 accreditation helps to minimize risk by ensuring that you are choosing a technically competent lab that has a sound quality system in place. This also allows you to avoid expensive retesting, which enhances your confidence in our product by assuring that it has been thoroughly evaluated by a competent testing calibration laboratory that has been assessed by a third party.

Please refer to product information page DS/PI-17B

No. Ashcroft’s® model 1490 is for gas applications and cannot be attached to diaphragm seals

A diaphragm seal is an isolation device that is attached to the inlet connection of a pressure instrument to isolate its measuring element from the process media. A diaphragm seal is commonly used in a variety of process applications where corrosives, slurries or viscous fluids may be encountered. The diaphragm seal affords protection to the instrument where: The process fluid being measured may clog the pressure element. Pressure element materials capable of withstanding corrosive effects of certain fluids are not available. The process fluid may freeze due to changes in ambient temperature and cause damage to the element.

Please refer to product information page DS/PI-87

Please refer to product information page DS/PI-55C

Please refer to product information page DS/PI-49A

Please refer to product information page DS/PI-32A

Please refer to product information page DS/PI-83

Depends on the software version, it is 1-2-0-4-5 or 1-2-*-4-5.

Yes you can. For all digital gauges, pre-programmed units can be accessed through the MENU function. The Model DG25 (only) can also read customer-defined units.

The 2174 is powered by the 4-20mA signal, while the 2274 is powered using a separate power supply. If the model 2274 includes the optional 4-20mA output or switch(s) the output signal and switches will have separate contacts from the power supply.

The unit has most likely been exposed to over or under pressures. As they are is not field resettable, they will need to be returned to Ashcroft for evaluation and possible recalibration.

No. The unit is likely in “tare mode”. A short press of the tare button will return the unit to standard measurement mode and read the current pressure.

Please reference the Installation and Maintenance guide for your model.

By re-scaling the graph, the 4-20mA can also be re-scaled. Accuracy of the gauge is based on full scale range. Re-scaling the graph does not change the full scale range. Instructions to alter the graph are in the Installation and Maintenance manual – see page 12.

No. The units are too sensitive to encourage anyone other than Ashcroft production to fix. In addition, they may require calibration as part of the repair.

Calibration certificate are standard on the model 2089. All other models require the XC4 option at the time of order.

Depends on the product family. Precision: no. Industrial: maybe. DG25: Yes. If range isn’t already set up, there will be a set-up fee for a new range.

Please refer to product information page ASH/PI-58A

Please refer to product information page ASH/PI-56

Please refer to product information page ASH/PI-45

Please refer to product information page ASH/PI-44

Please refer to product information page ASH/PI-52

No. Throttle plugs are designed to only fight pressure pulsation. Vibration requires either a liquid filled gauge or a PLUS!™ Performance gauge.

The product variation “XLL” designates PLUS!™ Performance in all Duragauge®, 1279, 1377, 1379, 2462, and Duralife®, 1009, 1008S type pressure gauges.

Yes. You must specify the silicone free option XNZ along with the XLL PLUS!™ Performance option. Our process cleans the system to meet ASME B40.100 Level IV.

The standard PLUS!™ Performance cannot be used in silicone free applications. However PLUS!™ Performance is available in a silicone free version. Order as XNZ for no silicone.

Please refer to product information page DS/PI-18B

Please refer to product information page ASH/PI-59

Please refer to product information page DU/PI-19A

Please refer to product information page DU/PI-61C

Please refer to product information page SA/PI-5

Please refer to product information page SS/PI-5A

Please refer to product information page ASH/PI-60C

Pressure pulsation can be dampened by several mechanisms; our patented PLUS!™ Performance gauge will handle the vast majority of applications. One exception to this is high frequency pulsation which is difficult to detect. The only indication may be an upscale zero shift due to movement wear. These applications should be addressed with a liquid filled gauge, or in extreme cases, a remotely mounted liquid filled gauge connected with a line of capillary. The small diameter of the capillary provides excellent dampening, but can get plugged. Pulsation dampeners and snubbers are alternative auxiliary devises which dampen pulsation with fewer tendencies to plug. Also throttle plugs or throttle screws inserted in the pressure connection of the pressure gauge may help solve this problem.

This is quite subjective and depends upon the severity of the indicated pressure. The environmental limitations for the pressure gauge series should be observed in all cases. Gauges used in situations outside these requirements may result in inaccuracies, premature wear and/or failure of the gauge and would require additional maintenance. The frequency of calibration therefore, is best left to the user to determine.

The range of the instrument should be approximately twice the maximum operating pressure. Too low a range may result in low life due to fatigue of the elastic element due to high operating stress and susceptibility to overpressure set due to pressure transients that exceed the normal operating pressure. Too high a range may yield insufficient resolution for the application.

No. The only difference is that the response time is similar to liquid filled gauges.

Ashcroft offers many different types of pressure connections based on different products. Please consult the data sheets, if you do not see the connection you require please contact us at in[email protected] or by calling our ActionLine® at 1-800-328-8258

Ashcroft does not offer a spare parts list; it is recommended that the user stock one complete Ashcroft instrument for every 10 of that instrument type in service.

Please see 7 steps for selecting a pressure gauge. (product selector)

A 3-2-3% of span designation stands for 3% in the first quarter of the scale, 2% in the middle half of the scale, and 3% in the last quarter of the scale. This accuracy is typically associated with commercial grade pressure gauges. (visual)

Please refer to 7 steps for selecting a pressure gauge. (product selector)

Proof pressure is the maximum pressure a gauge can withstand without evidence of change in accuracy. Burst pressure is the maximum pressure above which the pressure assembly may no longer hold pressure. Please refer to product information page ASH/PI-42C

Yes, please see product information page ASH/PI-63

Please refer to product information page SW/PI-59

Please refer to product information page SW/PI-66

Please refer to product information page SW/PI-30E

Please refer to product information page SW/PI-55A

Please refer to product information page SW/PI-27A

Please refer to product information page SW/PI-28B

The setpoint is the pressure, temperature, or differential pressure value where the electrical switch makes or breaks contact. The unit will return to the original or normal position once the switch reset point has been achieved.

Static pressure is the pressure exerted by a fluid or gas that is not moving or flowing. For differential pressure applications the static pressure refers to the lower of the two pressures applied to the actuator

A term commonly used in the industry referring to enclosures capable of withstanding an internal explosion of a specified gas without igniting surrounding gases. Strict installation practices in accordance with the national electrical code are also required for safety. Ashcroft currently offers many different types of explosion proof approvals such as UL, FM, CSA, ATEX, and IECEx.

Please refer to product information page SW/PI-6B

Accuracy normally refers to conformity of an indicated value to an accepted standard value. Since there is no indication in switch products, the term repeatability is used as the key performance measure. Repeatability is the closeness of agreement among a number of consecutive measurements of the output setpoint for the same value of the input under the same operating conditions, approaching from the same direction for full range traverses. Using this definition, the accuracy and repeatability of an Ashcroft® pressure switch is typically +/- 1% of full range.

Proof pressure is the maximum pressure which can be applied to a pressure switch without causing damage. While burst pressure is the maximum pressure that can be applied to a switch without causing leakage or rupture. A switch that has been subject to proof pressure should still be operational, but may require a recalibration of the setpoint. However, a switch that has been subject to the pressures near or at the burst pressure can be permanently damaged.

Deadband is the difference between the setpoint and reset point of a switch. Deadband can also be referred to as the hysteresis of a switch.

Ashcroft recommends that the setpoint be within 15 -100% of full range for an increasing setpoint and within 10-95% of full range for a decreasing setpoint.

The longest capillary length is 100 feet. Please consult the factory for special requirements

No, but in the A, B, F, G, L, and P series you can get a unit that has 2 SPDT switches that actuate at the same setpoint to simulate a DPDT switch. SPDT – Form C contact – single pole double throw, one contact which flips over, switching the input from Normally Closed to Normally Open. DPDT – 2 Form C contacts – double pole double throw, the same but two ganged together.

No, because thermometers are not pressure bearing instruments. The CRN #’s are available for Thermowells.

No

No. We only recommend polycarbonate windows with a liquid-filled thermometer due to case design. If this is not acceptable consider the 600B (dry) with the XSG option

A Thermowell performs an invaluable triple-duty service: 1.) it protects delicate instrument sensing elements against corrosive effects and physical damage caused by media flow, 2.) it permits the instrument interchange or calibration check without disturbing or closing down the process and 3.) it helps to contain costly or dangerous process fluids when properly installed as an integral part of the vessel or piping.

1.5 meter only.

Yes, provided they are ordered in whole feet measures.

IP54 for all Duratemp® Thermometerexcept the 600H model which is IP65.

NPSM threads are actually parallel but have the same pitch as NPT/NPF providing a fully engaged nice fit. NPT to NPT threads both being tapered can leave exposed threads.

A lag is the added EXTRA length on the installation end of a thermowell, typically called out to account for insulation thickness.

Siphons should be used in applications when instruments need to be protected from direct exposure to live steam.

A dampening device is used when a pressure instrument may be exposed to repetitive pressure fluctuations that are fairly rapid, high in magnitude and especially when transitory pressure spikes are present that exceed the instrument range. Throttle screws and plugs – provide dampening at an economical cost. They have the benefit of fitting completely within the gauge socket and are available in three types 1. A threaded type which permits easy removal for cleaning and replacement: 2. A Pressed in, non-threaded design and 3. A Pressed in, threaded design which provides a highly restrictive, helical flow path. Not all styles are available on all pressure instrument types. Pulsation Dampener/Ashcroft® model 1106 – threads onto an instrument socket and provides restriction by means of moving a pin, which may be placed in either of five different sized holes and thus allows the user to vary the amount of dampening to suit requirements. The pulsating pressure moves the pin up and down, providing a self cleaning action. Pressure snubber/Ashcroft® model 1112 – used for dampening and filtering, the snubber has a metal disc available in four standard grades of porosity 1. D: for use with oil, 2. E: for use with water and light oils, 3. G: for use with air, steam, and gases, 4. HX: for use with mercury. Due to the large filter area, the snubber has fewer tendencies to clog than orifice type devices. Needle Valves/Ashcroft® models 7001/7004 – an adjustable throttling device for severe applications. It provides the most practical means for varying the orifice to determine the exact orifice for any specific service condition. Pressure Limiting Valve – protects pressure instruments against surges and pulsations. Provides automatic positive pressure protection and accurate repeatable performance. Automatic pressure shut-off. Built in snubber enhances instrument, protecting performance.

Please see product information page TR/PI-24A

The X=RH option in not required on the 0.25% accuracy CXLdp. The 9 point NIST traceable calibration report ships with all 0.25% F.S. accuracy CXLdp transmitters.

Yes. A nine point NIST traceable Calibration Chart is available for the GC30 and GC31 by requesting the XRH option.

Please see product information page TR/PI-23

No. The only requirements for the GC30/31 to operate is a power supply and connection to the pressure being measured. The unit can operate simply as a digital pressure gauge if that’s the only need.

The front of the GC30/31 products has a keypad for the user to configure settings. The Instruction manual contains all of the necessary details needed to program the unit.

For most model pressure transducers, Ashcroft offers mating connectors and cable harnesses. Please contact the factory with the model/part number of your transducer so we advise a connector/harness part # and an Ashcroft dealer to purchase from.

No. The GC30 and the GC31 are unique new products that add to our current product and application capabilities.

No. The K1 and A2 transducers are only available with full vacuum scale (and/or positive pressure). In those compound situations, the positive pressure range can still be non-standard.

Yes, Ashcroft can. Non-standard calibrations are available for low pressure differentials, A2 and K product lines. These ranges should be verified by the product specialists.

Ashcroft manufacturing has standardized on 4 conductor cables, so one or two wires may not be used. Please install per the instructions in the Installation and Maintenance manual, using on the appropriate wires.

The model transducer you are searching might have been discontinued and replaced by a new model, or it could be a custom model number normally sold to OEM’s and not listed on the Ashcroft website. Please contact Ashcroft with the model number, information printed on the label and a picture of the unit if possible.

Ashcroft® does not recommend a specific recalibration cycle for our transducers. Recalibration standards should be established by our customers for their specific application.

Yes, the display of the GC51 can be rotated to accommodate the horizontal or vertical mounting positions.

1. Confirm the wiring is correct, Installation and Maintenance manuals are helpful here. 2. Confirm the power source is good and appropriately sized. Units require the necessary power at the transducer, not at the source. 3. Check with an external meter for expected output. If all issues are checked and the problem cannot be resolved, we ask that you contact an Ashcroft product specialist.

Yes! The DM61 is an Ashcroft® panel meter that can read voltage or amperage units and translate the signal to any customer defined units.

The model transducer needed is normally determined by the specifications required which include: pressure range, output, process connection, electrical connection, media compatibility, and accuracy. Other factors include specific agency approvals such as CE, Intrinsically Safe or Hazardous Duty. Ingress Protection ratings and quantity of transducers can also help identify which Ashcroft® model to select.

Only transducers that have accessible zero and span potentiometers can be recalibrated.