Fluke 700P07 Gauge Pressure Module 500PSI

Fluke 700P07 Gauge Pressure Module

Because pressure is one of the more widely measured parameters in process industries, it is a critical function of a documenting process calibrator. Fluke’s pressure modules cover a wide range of pressures and maintain accuracy over a wide temperature range, from 0°C to 50°C (32° F to 122°F). The pressure measurement portion of the Fluke 700 Series Documenting Process Calibrators is separate from the main unit to facilitate connection to fixed or bulky equipment and to provide multiple pressure ranges for a single calibrator

Quick and easy measurements

Fluke 700 Series pressure modules are easy to operate. To measure pressure, the technician disconnects the pressure measuring transmitter from the process, plumbs the pressure module to a pressure source, and connects the pressure module cable to the calibrator. Pressure is applied, measured by the pressure module, and displayed digitally on the calibrator. At the touch of a button, the pressure may be displayed in any of 10 different pressure units. Because the 700 Series calibrators can capture readings electronically, there’s no need to write down results. The calibrators automatically time-stamp and store all saved measurements, saving time, and eliminating errors associated with making manual notations in the field. These selfdocumenting capabilities are important in ensuring accurate maintenance. They are also very helpful in collecting calibration data to support compliance with documentation standards, including those established by OSHA, the FDA, the EPA, and ISO 9000.

Pressure module performance

Fluke 700 Series pressure modules are highly accurate, with simply stated specifications that apply from 0% to 100% of full span and from 0°C to 50°C (32°F to 122°F)—a factor that sets them apart from other pressure calibrators. Most ranges have total uncertainties of 0.05% of full scale (see Table 1, page 2). This performance is possible through the innovative application of mathematics and microprocessor power. Fluke pressure modules have silicon piezoresistor sensors which consist of a resistive bridge fabricated in a silicon diaphragm. Pressure applied to the diaphragm causes a change in the balance of the bridge which is proportional to the applied pressure. The bridge balance change is not linear and is very sensitive to temperature. However, since these effects are quite stable with time and through repetitive changes of condition, the sensors can be very accurate in measuring pressure over a wide temperature range, provided they are carefully characterized. During manufacture, Fluke pressure modules are characterized by reading temperature and pressure at more than 100 points. A least-squares regression is used to calculate the coefficients of polynomial expression for pressure. The coefficients, unique to that pressure module, are stored in the module’s memory.

Each module has its own microprocessor, allowing it to run the measurement circuitry and to communicate digitally with the calibrator. When connected to the calibrator, the coefficients are uploaded from the pressure module to the calibrator. Then, when pressure measurements are made, raw sensor values for pressure and temperature are digitally loaded to the calibrator, where the raw sensor values and coefficients are manipulated to derive and display the pressure reading. This innovative technique provides several benefits:

1. Digital communication eliminates errors due to poor connections and electrical interference
2. The modules are inherently temperature-compensated from 0°C to 50°C (32°F to 122°F), with no derating for temperature effects
3. The modules are fully interchangeable because all signal processing is handled in the pressure module itself and then communicated to the calibrator in digitized form. Modules are calibrated independently of the calibrator, and can be used with any 700 Series calibrator. Each module has its own serial number to facilitate traceability

Sensor protection in isolated modules

Many of these modules incorporate a stainless steel diaphragm to isolate the sensor. With these modules, any medium that is compatible with stainless steel can be used on the high side of the module.

Rugged construction

The pressure modules are designed to operate accurately and reliably despite the rough handling and harsh environmental conditions often found in process plants. A urethane overmolding protects against shock if a module is accidentally dropped and also seals against dirt, dust, and moisture. The module case is held together with screws connected to brass-reinforced seats, and all the pressure fittings, which are constructed of 316 stainless steel, have internal mechanical supports. Pressure connections are 1/4" NPT. A BSP/ISO adapter is also provided on all but the P29, P30 and P31.

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