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HT331: Single channel flowmeter with built-in chart recorder; 10 lb (4.5 Kg); 11" (27.8 cm) wide x 4" (9.1 cm) high x 14" (35.4 cm) deep; attached two-meter flowprobe-to-flowmeter extension cable; separate grounded medical grade power line-cord.
Input Power: Universal Power
Supply 50-60 Hz; 100-240 V ± 10% (automatic voltage adjustment)
Fuses: Both power entry conductors are protected by fuses (5 x 20,1.5A fast blo, mfg: bussman #GMA1.5,250 VAC
Electrical Isolation: Cabinet is grounded; line to ground leakage current: less than 50 µA @100-120 V line, less than 100 µA @ 220-240 V line. All electronic components and cabling of the probe extension cable and probe are fully isolated to meet IEC "cardiac floating" specifications. Defibrillator protection: probes can remain attached to the patient during cardiac defibrillation, for instantaneous report on the restoration of flow.
Automatic Meter Adjustments for all operational settings
- Ultrasound frequency and insonification parameters
- Probe size and corresponding flow output ranges
- Volume flow calibration of connected flowprobe
- Flow sampling rate: optimized for local acoustic conditions
Digital Identification: Probe identification and calibration parameters are programmed on an EEPROM inside the probe connector.
Analog Output: "Uniscale" output provides pulsatile flow (10 Hz low-pass filtered). Voltage scaling is independent of probe size and frequency. 0 Volt - zero flow; 1V = 200 ml/min; maximum range = ± 5V (± 1000 ml/min) BNC Outputs: Pulsatile (10 Hz low-pass filtered) and average (0.1Hz low-pass filtered) flow; voltage scaling: see probe specs.
FlowSound : audio representation of flow sensed by the probe; one octave increase in sound pitch = 4x increase in volume flow.
Measurement quality checks: Front panel ultrasound "bucket-style" level indicator provides visual feedback on ultrasound signal strength; automatically disables flow measurements when ultrasound signal conditions are insufficient. Front panel 6-digit display reports error conditions.
Chart Recorder Prints a permanent record of pulsatile flow wave along with date stamp (Y2K compliant) and values for mean, peak and minimum flow. Front panel push button engages the recorder; rear panel switch selects from 3 printing modes: "Slow" prints 20 cm flow record at 20 mm/sec; "Fast" prints 20 cm flow record at 40 mm/sec; "RUN/STOP" prints a continuous strip at 20 mm/sec.
Compatible Ultrasonic Transducers: HQN perivascular and sterile tubing (clamp-on) flowsensors for neurosurgery.
Ultrasonic Frequency/Parameters: The ultrasound output level of the flowsensors is factory-set and does not incorporate any interactive system features. These settings are made using "ALARA" principles (As Low As Reasonably Achievable), and are orders of magnitude below the FDA "preamendment levels," the USA insonification safety limits.
- Transducer excitation: Burst of 10 to 24 waves (probe size dependent).
- Transducer excitation frequency: 1.2 MHz to 4.8 MHz (probe size dependent).
- Transducer excitation rate: 1.2 KHz to 14 KHz (probe size dependent),
automatically reduced further when probe operates in adverse acoustic conditions that would degrade measurement accuracy.
RS232 output: Optically isolated digital data output for archiving of flow measurements.
Regulatory Compliance: Transonic Systems flowmeters and sensors comply with USA standards for medical and dental equipment (UL2601-1), and with European standards for medical and ultrasonic apparatus (IEC 601-1). These products are CE marked per 93/42EEC Annex II. Transonic Systems is an ISO9001/EN46001-certified facility
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