BD Sensors pressure and level instruments

DMP 331 pressure transmitters

DMP 331 is a pressure transmitter with a stainless steel sensing element. The series includes measuring ranges from 0–100 mbar to 0–60 bar; the standard accuracy is 0.35% FSO. Select a particular version using its complete ordering code.

For a new measuring point, specify the medium, normal operating pressure and possible pressure peaks. Identify the required output signal, supply and process connection. For replacement, attach the existing label and connection photographs.

DMP 321 industrial measurement

DMP 321 uses a stainless steel sensor for industrial pressure measurement. Its series spans nominal ranges from 0–100 mbar to 0–600 bar, with standard accuracy of 0.25% FSO and an optional 0.1% version. Start a project schedule with the required range and type of pressure.

State both medium and ambient temperatures. Keep different ranges on separate order lines, even when the housings look identical. If accuracy is a project requirement, include the acceptance criterion and the receiving input module.

DMD 331 differential pressure

DMD 331 measures the difference between two pressure points and is intended for plant and mechanical engineering. The series covers differential ranges from 0–20 mbar to 0–16 bar, with accuracy of 0.5% FSO.

An enquiry must distinguish differential pressure from the static pressure acting on the connections. Identify the medium on both sides and attach the positive and negative port arrangement. For filter monitoring, describe the upstream pressure, downstream pressure and maintenance threshold.

LMP 307 hydrostatic level probes

LMP 307 is a submersible stainless steel probe for continuous liquid level measurement. The series includes ranges from 0–1 to 0–250 metres of water column and standard accuracy of 0.35% FSO. Specify the liquid, its temperature and the maximum working level.

Cable length is a separate selection parameter from measuring range: include the distance to the junction box as well as immersion depth. For a well, describe the available opening and suspension arrangement.

LMK ceramic level probes

The LMK range uses ceramic sensing elements and includes several probe constructions. LMK 307 combines a ceramic sensor with a stainless steel housing; LMK 358 is a detachable probe design. Select the construction around the liquid and maintenance procedure.

State the composition, contamination, sediment and cleaning method. Where the measuring section can be detached, identify both sides of the connection and provide photographs. For chemically demanding media, include concentration and temperature.

Specify the required housing, seal and cable materials in the project schedule so they can be checked together for the particular application.

Digital pressure measurement

BD SENSORS has a separate digital transmitter range covering IO-Link, RS-485 Modbus and I²C interfaces. Choose the interface from the control-system architecture and the receiving device. For a replacement, retain the complete model code, device address and communication settings.

Include the device description or register information used by the application. A new installation should have a measuring-point list and network diagram. Identify the cable, connector and supply arrangement.

State who will configure the controller and commission the measurement, and separate the instrument supply from any software or commissioning requirements.

Digital pressure gauges

Digital pressure gauges provide a local pressure reading at the measurement point. BD SENSORS lists them separately from transmitters intended to send a signal to a control system. Define whether the instrument is for routine process observation, a test bench or portable measurement.

Specify range, pressure type and display units. Describe the power arrangement and the viewing position available at the installation. For a test bench, include the measurement requirements and connection method.

Keep adaptors and other accessories as separate items, and attach the existing instrument label when requesting a repeat purchase.

Electronic pressure switches

Electronic pressure switches operate outputs at configured pressure thresholds. The BD SENSORS range includes versions with and without a display. Selection starts with the number and electrical type of outputs, switching points and receiving load.

State whether the application also needs a continuous measurement signal. For an existing machine, attach the electrical diagram and recorded settings; a housing photograph does not describe the control logic. Identify the technician responsible for checking the replacement and commissioning it.

For a new project, describe the intended switching sequence and how the controller uses each output.

Cables, connectors and installation accessories

Treat installation accessories as individual order items linked to the exact transmitter. Identify both cable ends, length, pin assignment and routing environment. For a connector, provide its marking, orientation and contact count.

Process adaptors need thread identification, dimensions and sealing details. A complete equipment schedule should show how many accessories are required for each measurement point.

If only a connector or cable entry is damaged, include close photographs and explain whether the request is for that component or for the complete instrument. The required supply composition can then be checked against the particular device.

Range and pressure reference

Record the measuring range together with units and pressure reference: gauge, absolute or differential. Copy the original label exactly, including a negative lower limit. Separate normal operation, short pressure peaks and any test conditions.

State the units and scaling used by the receiving system. A reading observed during one operating state does not identify the instrument range. For a new installation, provide the process specification and identify who will approve the selected range.

For replacement, include the current input-channel scaling so the instrument and control-system settings can be considered together.

Medium and wetted materials

Selection must consider every wetted component, including the diaphragm, process connection and seals. Provide the actual medium composition, concentration, contamination and temperature at the measurement point. Describe cleaning or flushing separately from normal operation.

Where the installed version is documented, list its materials and sealing arrangement. Water, oil and process solutions may require different constructions at the same pressure. If a previous instrument failed after a cleaning cycle, include that operating condition in the enquiry.

The application review should use the particular medium and ordered version rather than a general series description.

Output and electrical connection

The transmitter output must be considered together with the receiving input. Record the signal, supply voltage, wiring arrangement and pin assignment from the installed documentation. Identify whether the application uses a current, voltage or digital output.

Include the input-module model and any intermediate barrier or converter. If the signal passes through several terminal boxes, show the complete connection to the controller. Photographs are useful for identifying hardware but should accompany a wiring diagram.

State whether the control cabinet has been modified since installation, because the original transmitter description may no longer describe the complete loop.

Replacement in an existing machine

For a repeat purchase, retain the full ordering code, suffixes and quantity. If the sensor belongs to another manufacturer’s machine, include the machine model and spare-parts-list position. Photograph the label straight on and show the installed connection.

Explain the reason for replacement and any observed behaviour. If the marking is unreadable, start with the machine documentation and connection dimensions. For an alternative version, list the parameters that must remain unchanged and the changes the installation can accept.

Assign technical approval to the person responsible for the equipment before the order is finalised.

Measurement equipment for a project

BD SENSORS specialises in electronic pressure measurement and hydrostatic level measurement. A project enquiry is easiest to review as a measuring-point schedule separating pressure, differential-pressure and submersible instruments. For each point, state the medium, range, temperature and purpose.

Add the output, supply, cable and receiving channel. Include installation drawings and access requirements. Separate operational quantities from maintenance spares, and identify which instruments need accessories as part of the package.

Group identical versions while preserving their measuring-point references. List the documentation required with the proposal and identify the project contact for technical decisions.