DP & Flow Transmitter
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MICRO-BAR DIFFERENTIAL PRESSURE/FLOW TRANSMITTER
Micro-Bar electronic transmitter incorporates a capacitance based differential pressure cell for sensitive measurement on Air or other dry gases. Designed for gas flow measurement applications on extraction or ventilation systems, the micro based electronics uses calibration formulae required for Flo- Bar Averaging Pitot tubes, Orifice Plates or other standard DP based sensors. Simply installed adjacent to the flow line, standard pressure impulse tubing links the sensor directly to the Micro-Bar unit. Flow rate, flow units and alarm status are displayed on the two line LCD: external signal transmission is via the 4-20mA loop power,with separate alarm relay and totaliser pulse.
With simple adjustment over a 5:1 full scale pressure range available to the operator on site, the Micro-Bar suits varying process conditions or output scaling requirements. The micro based electronics simplifies site setup procedures, allowing adjustment of alarm output set points, totalisation pulse rate, averaging time and zero checking.
Micro-Bar is applicable to measuring pressure differentials on operating theatres, clean rooms or glove boxes, to monitor system performance and provide alarms. On process monitoring, Micro-Bar is used for air filter blockage monitoring and burner control on furnaces. For these duties, the display shows the pressure drop directly.
FEATURES
Micro-Bar electronic transmitter incorporates a capacitance based differential pressure cell for sensitive measurement on Air or other dry gases. Designed for gas flow measurement applications on extraction or ventilation systems, the micro based electronics uses calibration formulae required for Flo- Bar Averaging Pitot tubes, Orifice Plates or other standard DP based sensors. Simply installed adjacent to the flow line, standard pressure impulse tubing links the sensor directly to the Micro-Bar unit. Flow rate, flow units and alarm status are displayed on the two line LCD: external signal transmission is via the 4-20mA loop power,with separate alarm relay and totaliser pulse.
With simple adjustment over a 5:1 full scale pressure range available to the operator on site, the Micro-Bar suits varying process conditions or output scaling requirements. The micro based electronics simplifies site setup procedures, allowing adjustment of alarm output set points, totalisation pulse rate, averaging time and zero checking.
Micro-Bar is applicable to measuring pressure differentials on operating theatres, clean rooms or glove boxes, to monitor system performance and provide alarms. On process monitoring, Micro-Bar is used for air filter blockage monitoring and burner control on furnaces. For these duties, the display shows the pressure drop directly.
FEATURES
- DP measurement for gases
- High sensitivity and linearisation for Pitot tube flow measurement
- Digital flowrate display in Engineering units
- ±0.5% accuracy
- Flow totaliser pulse output
- High and low flow alarms
- Site programmable outputs
Full Product Specification
| Media | Air or dry non-corrosive gases |
| Range (max DP) See Coding Breakdown for Details |
0-30 Pa (0-0.1” wg) 0-100 Pa (0-0.4” wg) 0-150 Pa (0-0.6” wg) 0-300 Pa (0-1.2” wg) 0-1000 Pa (0-4” wg) 0-3000 Pa (0-12” wg) 0-10 kPa (0-40” wg) 0-30 kPa (0-120” wg) 0-1 bar (0-400” wg) |
| Output | 4-20mA |
| 20mA Adjustment | 20% to 100% of max DP |
| Zero DP Setting | Adjustable 0-100% of max DP range |
| Output vs DP | Selectable linear or square root |
| Display | 2 line, 16 x 5mm high digits showing flow/pressure, units and alarm status |
| Power Supply | 10-50vdc loop powered |
| Averaging | 0-60 seconds adjustable |
| Accuracy@20mA | ±0.5% of max DP range ±0.75% of reading |
| Temperature Range | 0-40ºC |
| Long Term Drift | 0.5% per year |
| Static Pressure Max | 5 times max DP range |
| Pressure Connections | Pushfit sockets for 4mm OD tubing or 1/4” NPT Female |
| Alarm Outputs | 2 x volt free relay contacts Selectable NO/NC Max 1 Amp rating 110V ac/dc |
| Flow Totaliser | One alarm relay optionally selectable as totaliser. Max pulse rate 100 pulse/minute. Pulse length 50msec |
| Enclosure | Polyester. IP66 with separate terminal compartment |
| Electrical Connections | 2 x M20 glands |
Recommended Products
Differential Pressure Gauge
The Magnehelic® gauge uses magnetic coupling from the movement of a silicon rubber diaphram onto a helical pointer drive shaft. This measurement is friction free, accurate at very low differential pressures, and resistant to shock and vibration. The standard aluminium housing can be flush panel mounted. Pressure connections are duplicated on rear and side of the unit. Plugs and tube barbs supplied.
Magnehelic® Accessories
Platon Averaging Pitot Tube: Flo-Bar
The Flo-Bar is an Averaging Pitot Tube flow sensor for use on pipes/ducts or chimneys. Differential pressure created across the Flo-Bar has the standard square root relationship to flow rate, making a simple, removable sensor for installation or retrofit on flowlines of any size.
The unique design of the Flo-Bar profile provides a high accuracy, wide rangeability sensor: the standard integral manifold allows simple process isolation and easy installation of a DP measurement cell.
Platon In-Line Pitot
The In-Line Pitot "Flo-bar" are Stainless Steel pipe sections with welded-in pitot probes, available for ½" to 2" pipes. They are supplied fitted with ¼" ball valves to provide process isolation.
UKAS and Traceable Calibration
Roxspur Measurement & Control Ltd is an ISO 9001:2008 company, we offer UKAS and traceable calibration under BS/EN ISO17025 accredited procedures. Our certificate generation systems are purposely geared to meet the strict and specific requirement of the Aerospace industry.
Calibration
Based at our factory in Sheffield our accredited laboratories are available to provide either on-site or in-house calibration to either UKAS or national standards. We cover Temperature (up to 2,200ºC), Pressure (up to 1,200 bar), Flow (up to 2,500 L/min) and Electrical parameters and provide certification using the latest technology.
Our team of experienced on-site engineers hold accreditation for the on-site calibration of equipment including autoclaves, furnaces, thermocouples and probes, scales and balances, ovens and chambers, indicators and controllers, pressure and electrical. We cover the full spectrum of industry sectors. All calibration standards used meet the requirements of Table 3 of AMS 2750D, whether in the laboratory or on site, ensuring full compliance with the specification. To find out more about our on-site services please click here.
We supply thermocouples calibrated and certified to meet the requirements of Table 1 of AMS 2750D appropriate to customer specified usage.
Aerospace Heat Treatment Specialists
From the supply of a single thermocouple to fully managed service contracts, by working in partnership with our customers we can assist in obtaining and maintaining NADCAP approval. To find out more about our specialist aerospace services please click here.
Certification
Certificates generated are designed to meet the requirements of AMS 2750D with the option of UKAS certificates for added peace of mind.
Differential Pressure Gauge
The Magnehelic® gauge uses magnetic coupling from the movement of a silicon rubber diaphram onto a helical pointer drive shaft. This measurement is friction free, accurate at very low differential pressures, and resistant to shock and vibration. The standard aluminium housing can be flush panel mounted. Pressure connections are duplicated on rear and side of the unit. Plugs and tube barbs supplied.Magnehelic® Accessories
- Pipe mounting kit
- Line filter
- Portable kit
- Safety relief valve
- Air filter kit
Platon Averaging Pitot Tube: Flo-Bar
The Flo-Bar is an Averaging Pitot Tube flow sensor for use on pipes/ducts or chimneys. Differential pressure created across the Flo-Bar has the standard square root relationship to flow rate, making a simple, removable sensor for installation or retrofit on flowlines of any size.The unique design of the Flo-Bar profile provides a high accuracy, wide rangeability sensor: the standard integral manifold allows simple process isolation and easy installation of a DP measurement cell.
- Flow sensor for liquids, gases or steam
- ± 1% Accuracy with standard square root flow output
- Full electron beam welded construction
- Unique profile sensor with flow averaging
- Integral 3 valve manifold
- Simple direct mounting of DP transmitter if required
- Plain head and remote manifolds available
- An in-line version for small pipes is also available.
Platon In-Line Pitot
The In-Line Pitot "Flo-bar" are Stainless Steel pipe sections with welded-in pitot probes, available for ½" to 2" pipes. They are supplied fitted with ¼" ball valves to provide process isolation.- Flow sensors for liquids or gases
- ±1% of actual flow rate
- Full electron beam welded construction
- Flow averaging
- Internal isolation ball valve
- No power supply required
UKAS and Traceable Calibration
Roxspur Measurement & Control Ltd is an ISO 9001:2008 company, we offer UKAS and traceable calibration under BS/EN ISO17025 accredited procedures. Our certificate generation systems are purposely geared to meet the strict and specific requirement of the Aerospace industry.Calibration
Based at our factory in Sheffield our accredited laboratories are available to provide either on-site or in-house calibration to either UKAS or national standards. We cover Temperature (up to 2,200ºC), Pressure (up to 1,200 bar), Flow (up to 2,500 L/min) and Electrical parameters and provide certification using the latest technology.
Our team of experienced on-site engineers hold accreditation for the on-site calibration of equipment including autoclaves, furnaces, thermocouples and probes, scales and balances, ovens and chambers, indicators and controllers, pressure and electrical. We cover the full spectrum of industry sectors. All calibration standards used meet the requirements of Table 3 of AMS 2750D, whether in the laboratory or on site, ensuring full compliance with the specification. To find out more about our on-site services please click here.
We supply thermocouples calibrated and certified to meet the requirements of Table 1 of AMS 2750D appropriate to customer specified usage.
Aerospace Heat Treatment Specialists
From the supply of a single thermocouple to fully managed service contracts, by working in partnership with our customers we can assist in obtaining and maintaining NADCAP approval. To find out more about our specialist aerospace services please click here.
Certification
Certificates generated are designed to meet the requirements of AMS 2750D with the option of UKAS certificates for added peace of mind.
