Electronics

Should cost be the deciding factor in purchasing a transducer?

​Cost of components is always a driving consideration to any system designer. Unfortunately, the cost of diagnosing and servicing a control system because of a failed transducer is many times the cost of the transducer. Make sure you deal with a company you know that meets their claimed specifications. Complaints of electronic failures, excessive thermal drift or leaking cables abound in the industry. Sometimes the devices just don’t meet the claimed specification. Companies that manufacturer poor transducers do thrive – they make money because they are always selling replacements units.

What is the operating pressure range or required over pressure range for the application?

​As well as taking into account the normal working pressure of the sensor, you should review the maximum possible overrange to which a sensor is likely to be subjected in your application. In addition, the type of pressure measurement may affect the sensor life. For instance, continual pressure pulsing of certain sensor types will cause fatigue. Sensors cover pressure ranges from 15 PSI to 10,000 PSI full range. High overload protection has become a very important factor in sensor performance. HYDAC strain gauge sensors, with a built in positive overload stop, take 200% overload as standard. In high fatigue areas, special units are offered to withstand hostile environments.

What types of pressure reference are there?

​Gauge Pressure – The measurement is referenced to the atmospheric pressure. Zero is set at atmospheric pressure.
Sealed Gauge Pressure – The measurement is referenced to a sealed internal reference pressure. Zero is set at atmospheric pressure.
Absolute Pressure (A) – Measurement is referenced to an internally sealed vacuum. Zero is usually set at absolute zero.

What is the excitation voltage and required output?

​HYDAC’s basic sensor has a 4-20 mA or 0-10 VDC output from a 10-30 VDC unregulated supply.

What are pressure and electrical interface requirements?

​You may choose to make the electrical termination of your pressure sensor either by connector or cable. HYDAC pressure sensors are offered with 3 types of 4 pin electrical connectors (mating part supplied in some cases) or a one meter (39 inches), 4-core cable (additional length by request).

What is the required accuracy?

​Accuracy is a measured term used to determine the nonlinearity, hysteresis and non-repeatability of a pressure unit, together with thermal characteristics. Another point to consider is long term stability and repeatability if you require a sensor with repeatable measurement over a long period of time.

What is the pressure medium and operating environment?

​You must determine the suitability of a transducer for liquids or gases and its ability to withstand corrosion. Also, consideration must be given to areas like vibration, shock, etc. HYDAC standard transducers are made using 316 stainless steel and can withstand most dry gases and pressure medium such as lubrication oil, hydraulic oil, harsh chemicals, etc.

What is the operating temperature range?

​There are two factors when determining operating temperature range of the pressure sensor: what is the media temperature and to what temperature is the complete sensor exposed? If the media temperature is excessively high, fitting a standoff pipe between the media and the sensor may reduce it. Temperature compensation of HYDAC sensors is normally up to a maximum of 100 °C (212 °F) and operating temperature range from -25 °C to 85 °C (-13 °F to 185 °F).

Is HYDAC willing to manufacture a non-standard type of pressure sensor?

​Yes, HYDAC manufactures non-standard pressure sensors. A large part of our business dealing in pressure sensors is generated from non-standard type of applications. Some are very minor changes such as non-standard pressure ranges, pressure ports etc. Still others are full custom designs. As a guide line, the type of questions which we will ask before we can accept a non-standard project are: Annual quantity, minimum purchase quantities, design time requirements etc.

What type of technology does HYDAC use for its pressure sensors?

​Currently HYDAC uses thin-film and ceramic sensor technology for its sensors. Your specifications talk about proof and burst pressures.

What do these specifications refer to?

​The proof pressure is the maximum pressure, which can be applied to a transducer, which does not cause irreversible damage. The burst pressure is the applied pressure, which causes permanent damage.

HMG software for Window 7, 64 bits driver?

​The driver offered for the HMG software is only offered with a 64 bit driver.

HMG 3010 operation. How to connect sensors manually?

See page 83 in our Electronics catalog for wiring diagram and page 19 for instructions.

Calibration certificates for pressure transducers availability?

​The proof pressure is the maximum pressure, which can be applied to a transducer, which does not cause irreversible damage. The burst pressure is the applied pressure, which causes permanent damage.

Is the HDA 3700 available?

​The HDA 3700 series has been replaced by the HDA 4700 series.

When is calibration needed?

​Calibration should be done at least once a year depending on the operating conditions and whether it is intended for use as a measurement or test equipment.

Wiring color for pins

​Pinouts for standard transducers are listed in each datasheet on the website.

Are the hazardous “Triple approved” pressure transducers rated IP69K?

​The higher pressure transducers reading over 500 psi are sealed gauge and are rated IP 69K. The pressure transducers below 500 psi are vented gauge and are rated IP 65.

How long of a cable can I have built with the hazardous pressure transducer?

​The maximum length you can get with the hazardous pressure transducer is 10 meters (393 inches).

How high of a pressure can you go up to?

​Currently, we have the capability to measure up to 30,000 psi.

What is the response time of our pressure transducers?

​The response time of our pressure transducers depends on the series. Typically the standard HDA 4000 has a response time of 1 ms and the HDA 7000 series has a response time of 2 ms. For verification, please see the datasheet for the appropriate pressure transducer.

When do I need a vented gauge for a hazardous pressure transducer?

​When you are measuring under 500 psi you would need a vented gauge. We can vent it longitude to the threads or perpendicular to the threads to the outside (atmosphere).

Why is their 4 wires exiting the cable version of the hazardous transducers and only 2 wires are used for the 4-20mA signal?

​We use the same cable across the whole product range from transducers to switches.

Can I use a hazardous rated flush mount transducer for mud applications?

​No, the media must not be abrasive. You can possibly use a KEM-X adapter to prevent the port on the pressure transducer from clogging.

Can I use the HMG 3000 in a hazardous environment?

​No, it must be used in a nonhazardous environment.

When using a programmable pressure switch what do I do with the green programmable lead when I am done programming the switch?

​The green wire will need to be terminated. It must be connected to ground (0V).

When programming a switch do you need to have power to the HPG 3000 at all times?

​Yes, a minimum of 12V must be maintained during programming the switch.

How high of a pressure can the probe length take for a temperature transducer?

​For probes with 10mm length have an 8700 psi rating and for probes with 100 mm, 250 mm, and 350 mm have a pressure rating of 1800 psi.