
Transonic Flowprobes and Flowsensors
A range of Flowprobes and Flowsensors are available to measure fluid flow in laboratory tubing; blood flow in vessels of various diameters; and cardiac output in acute and chronic preparations.
Overview
A range of flowprobes and flowsensors are available from Transonic Systems, which are designed to be used with corresponding flowmeter modules, to accurately and precisely measure various fluid volume flows.
Perivascular Flowprobes
Measure acute and chronic in vivo flow in both small and large animal blood vessel. Perivascular flowprobes are placed external to the vessel and do not interfere with flow to the target tissues. For use with Perivascular Flow System Options.
Tubing Flowsensors
Measure volume flow in laboratory tubing containing non-aerated liquids including water, saline, buffer solutions, blood, and other fluids, either by splicing into or clamping onto the tubing depending on the design. Tubing flowsensors provide reliable, stable measurements even under perturbed and non-steady flow conditions. For use with Tubing Flow System Options.
Precalibrated for easy, immediate use
Transonic flowprobes and flowsensors are precalibrated and ready for immediate use. Data is recorded with a corresponding flowmeter module and via an Instrument Interface and/or PowerLab into LabChart software, where flexible recording options and real-time calculations are available.
Product Configurations
PS and PR Flowprobes
These Flowprobes loosely encircle the vessel and position two transducers opposing a reflective plate to measure volume flow. The PS and PR series are available in a range of sizes, from 0.5 mm – 20 mm diameter. A 75 – 95% fit of the vessel in the probe is recommended for accurate measurements.
Ordering details:
- PR and PS series probes are available for acute use (specify with prefix "MA") or as a custom, implantable configuration ("MC").
- The choice of cable orientation is available for the PR and PS series only. Choose the cable orientation that best suits the anatomical site:
- Back "B" = perpendicular to the vessel;
- Side "S" = parallel to the vessel;
- Lateral "L" = for thoracotomy or special application.
PS Series
- Sizes: n = 0.5, 0.7, 1.5, 2, 2.5, 3, 4, 6, 8, 10, 12, 14, 16, 20 mm vessel diameter
- Acute Use: MA- nPSx (where n = size, series = PS, cable orientation = x)
- MA-nPSB (back cable orientation perpendicular to vessel)
- MA-nPSS (side cable orientation parallel to vessel)
- MA-nPSL (lateral cable orientation 0.5, 1.5, 2, 2.5, 3 only)
- Chronic Use: MC- nPSx-__-__-__-__ (specify cable length, reflector style, connector style, and acute/ chronic calibration)
PR Series
- Sizes: n = 1, 1.5 mm vessel diameter
- Acute Use:
- MA-nPRB (back cable orientation perpendicular to vessel)
- MA-nPRS (side cable orientation parallel to vessel)
- Chronic Use: MC- nPRx-__-__-__-__ (specify cable length, reflector style, connector style, and acute/ chronic calibration)

Microcirculation Flowprobes 0.5 and 0.7mm
V Series flowprobes, also known as Flex series nanoprobes, are designed for acute flow measurements with high resolution at low flows in small blood vessels, which is ideal for mice. The smaller probe is suitable for vessel diameters of 0.25 - 0.5 mm (mouse and rat femoral or hepatic arteries), while the larger probe is suitable for vessel diameters of 0.35 - 0.7 mm (mouse carotid and mesenteric arteries or portal vein; and rat carotid, superior mesenteric and renal arteries). Each flowprobe has a 60 cm cable and a Flexi-handle with CRA10 connector.

Precision Handle Flowprobes
These 2 – 14 mm Flowprobes have attached handles for intraoperative measurements in preclinical animal trials or vascular surgeries. The handle has a bendable neck so the probe head may be positioned as required. The open J-reflector encircles the vessel for momentary flow readings.
Acoustic gel is required to fill the air space between the probe and vessel to transmit the ultrasound signal. Hence these Flowprobes are only available for acute use preparations.
Ordering details:
- Acute use only: MA-nPMP
- Sizes: n = 2, 3, 4, 6, 8, 10, 12, 14 mm diameter

COnfidence Flowprobes
These cardiac output (CO) Flowprobes represent a completely new concept in Flowprobe design. Validated X-pattern full flow illumination is enhanced by a soft plastic probe liner to cushion the vessel, permitting sustained ultrasonic transmission with little need for acoustic coupling gel during acute intraoperative use and safe for extended implantation without complicated protocols to protect the vessel. Ideal for accurate, immediate, beat-to-beat measurements on the ascending aorta and pulmonary artery in large animal studies.
Ordering details:
- Please specify cable length and connector (see Details tab).
- Product code: MCnPAU where n = Size
- Sizes: n = 8, 10, 12, 14, 16, 20, 24, 28, 32, 36 mm vessel diameter
- Disposable Ultrafit Liners are available in two styles:
- acute open style for momentary measurement
- closed full-circle style for extended & chronic application.
- Each COnfidence Flowprobe is supplied with 1 acute and 1 closed Disposable Ultrafit liner of the same diameter as the Flowprobe. These liners are recommended for single use only and can be purchased separately (reorder) in packs of 5.
Note: The PAU series replaces the PAX series.

Mouse Nanoprobes
Nanoprobes are specialized, miniature PS series Flowprobes, designed to measure mouse-sized blood flows of < 1 ml/min with Transonic Systems signature high resolution quality.
PS Series Nanoprobes
- Sizes: n = 0.5, 0.7, 1.5 mm vessel diameter
- Acute Use:
- MA-nPSB (back cable orientation perpendicular to vessel 0.5, 0.7 only)
- MA-nPSS (side cable orientation parallel to vessel 0.5, 0.7 only)
- MA-nPSL (lateral cable orientation 0.5, 1.5 only)
- Chronic Use: MC-nPSx-__-__-__-__ (specify cable length, reflector style, connector style, and acute/ chronic calibration)

Clamp-on Flowsensors (3-32mm outer diameter)
PXL Series sensors “clamp-on” to most flexible laboratory and extracorporeal tubing. They provide total physical and electrical isolation is maintained between the sensor and the liquid, and thus ideal for quick, repeatable process testing that is applied to multiple circuits without flow interruption. Applications include artificial heart and VAD performance, medical device and pump engineering, manufacturing and compliance flow testing. Different options are available for tubing outer diameter measured in inches and mm. Each flowsensor is supplied standard with 2 m cable and a CC16 16-pin metal connector.

Inline Flowsensors (2-25mm inside diameter)
PXN series sensors offer flexibility in studies where tubing requirements are subject to change. Sensors splice into laboratory tubing for volume flow measurements of blood and other fluids, ranging from <1 to 100 L/min. Applications include perfused isolated organ studies, flow phantoms and circulatory models, tubing flow requiring maximum sensitivity. Each flowsensor is supplied standard with 1.85 m cable and a CC16 or CP16 16-pin metal connector.

Related
Research Applications
Cardiovascular Hemodynamics
Langendorff
Cardiovascular Isolated Heart Systems
In Vitro Pharmacology + Isolated Tissue and Organs
Working Heart
Cardiovascular Isolated Heart Systems
In Vitro Pharmacology + Isolated Tissue and Organs
Tubing Flow
In Vitro Pharmacology + Isolated Tissue and Organs
Key Features
- Absolute volume flow data from mice to large animals
- Perivascular Flowprobes designed for use with Flowmeter systems
- Acute use or implantable for chronic use to measure flow in arteries, veins and ducts
- Multiple configurations to meet experimental needs of many animal models
- Unparalleled accuracy and signature high resolution flow waveforms
Support
Support Articles
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Details and Tech Specs
Technical
Product Code | Product Name |
---|---|
MA-n-PS-ori | Precision S series Flowprobes |
MC-n-PR-ori-ref-len-con-cal | Custom Precision R series Flowprobes |
MA-n-VB FLEX | Microcirculation Flex V series Flowprobes |
MA-n-PMP | Intraoperative PMP series Flowprobes |
MA-n-PAU | COnfidence PAU series Flowprobes |
ME-n-PXL-fld-tem-flow | Clamp-on PXL series Flowsensors (1/16” outside diameter increments) |
ME-n-PXN-fld-tem-flow | Inline PXN series Flowsensors |
Flowprobes specifications include:
n = size
ori = cable orientation
ref = reflector style
len = cable length
con = connector
cal = calibration
Flowsensor options (up to four per flowsensor) include:
n = size
fld = fluid (i.e KR for Krebs, BL for blood, H2O for water, FX for custom fluid)
tem = temperature (in degrees Celsius; i.e 23, 35, 37)
flow = flow rate (SF for standard flow or LF for low flow)
Note that tubing type and size (inside diameter x wall x outside diameter) must be additionally specified when ordering PXL flowsensors. For example: • Tygon ND 100-65 (1/4” inside diameter x 1/16” wall x 3/8” outside diameter)
• Tygon E-3603 (1/4” inside diameter x 1/16” wall x 3/8” outside diameter)
Pre-consultation is highly recommended before flowsensor selection.
Sizes
Flowprobes/Flowsensors | n | Units |
---|---|---|
PS | 0.5, 0.7, 1.5, 2, 2.5, 3, 4, 6, 8, 10, 12, 14, 16, 20 | Vessel Diameter (mm) |
PR | 1, 1.5 | Vessel Diameter (mm) |
V | 0.5, 0.7 | Vessel Diameter (mm) |
PMP | 2, 3, 4, 6, 8, 10, 12, 14 | Vessel Diameter (mm) |
PAU | 8, 10, 12, 14, 16, 20, 24, 28, 32, 36 | Vessel Diameter (mm) |
PXL | 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16, 20 | Tubing Outside Diameter (x1/16 inches) |
PXN | 1, 2, 3, 4, 5, 6, 10, 13, 16, 19, 25 | Tubing Inside Diameter (mm) |
CODE | ORIENTATION | PS SERIES | PR SERIES |
---|---|---|---|
B | Back | 0.5 – 20 | 1 – 1.5 |
S | Side | 0.5 – 20 | 1 – 1.5 |
L | Lateral | 0.5, 1.5 – 2.5 | N/A |
*Determined by anatomical approach |
Calibration
CODE | DESCRIPTION | PS/ PR | PMP/ V | PAU |
---|---|---|---|---|
GA | Acute calibration | all sizes | ||
GC | Chronic calibration | all sizes | N/A | |
GAC | Acute/ Chronic calibration | N/A | N/A | all sizes |
CODE | DESCRIPTION | PS SERIES | PR SERIES | PAU SERIES |
---|---|---|---|---|
WCxx | Up to 60 cm | Nanoprobes | 1 – 1.5 | |
WCxxx | Up to 100 cm | 2 - 20* | N/A | |
WCxxx | Up to 200 cm | N/A | N/A | 8 - 36* |
*Substitute xx for shorter lengths |
CODE | DESCRIPTION | PS SERIES | PR SERIES | MA STANDARD |
---|---|---|---|---|
LS | L with slide cover | 3 - 20 | N/A | 3 - 20 PS |
LSF | L with slide and silicone flange | 3, 4, 6 | N/A | |
JN | J without slide | 0.5 - 16 | 1 - 1.5 | 1.5 PSL |
JFH | J without slide, with flexi-handle | 0.5 - 2.5 | 1 - 1.5 | 0.5, 0.7 PS |
JS | J with slide cover | 2 - 16 | 1 - 1.5 | 2 - 2.5 PS, 1 - 1.5 PR |
JSF | J without slide and silicone flange | 2, 2.5 | N/A | |
U | U reflector | 3 - 20 | N/A | |
USW | U with wide silicone shield | 6 - 20 | N/A | |
USN | U with narrow silicone shield | 6 - 20 | N/A | |
MRI | non-magnetic reflector | 2 - 20 | N/A |
CODE | DESCRIPTION | ACUTE/CHRONIC | ANIMALS | ID KEY REQD. | PS/ PR | PAU |
---|---|---|---|---|---|---|
CRA10 | 10-pin Redel acute connector | Acute | All | No | all sizes | |
CRS10 | 10-pin Redel sealed connector with cap | Chronic | Dog and larger | No | all sizes | |
CS12 | 12-pin titanium connector with cap | Chronic | Dog and larger | No | 1 - 20 | all sizes |
CB12 | 12-pin titanium skin button with cap | Chronic | Dog and larger | No | 1 - 20 | all sizes |
CM4B | 4-pin mini connector with cap and straight cable | Chronic | Rat, Rabbit and larger | Yes | all sizes | N/A |
CM4S | 4-pin mini connector with cap and right angle cable | Chronic | Rat and Rabbit | Yes | all sizes | N/A |
CA4B | 4-pin micro connector with straight cable | Chronic | Rat and Mouse | Yes | 0.5 - 1.0 | N/A |
CA4S | 4-pin micro connector with right angle cable | Chronic | Rat and Mouse | Yes | 0.5 - 1.0 | N/A |