The Bios DryCal ML-500  offers continuous readouts of flow rate, flow average, and the averaged number of readings for both volumetric and STP corrected flow. The Bios DryCal ML-500  has three interchangeable flow cells providing measurements from 5.0 sccm to 50 L/min. 

Bios DryCal flow cells use a patented, near frictionless dry-piston and precision photo-optic sensors to obtain volumetric flow readings quickly and accurately. The readings are direct and primary; no assumptions about gas characteristics are needed and there is no mechanism for significant calibration drift. Flow is measured directly as volume per unit time. Internal self-tests by the Bios DryCal ML-500 (patent pending) automatically validate each readings accuracy. Flow is displayed directly at room conditions and at STP conditions. The standardizing sensors are located in the measured gas stream, directly the the entrance to the measuring cylinder for highest accuracy.

Fast
The Bios DryCal ML-500 saves valuable time.

Alphanumeric Display (LCD)
Indicates the volumetric flow rate and the average flow rate, battery charge level and the number of readings in a running average. The Bios DryCal ML-500 displays the atmospheric pressure and flow rate corrected to STP and the average flow rate at STP.

Three Interchangeable Flow Cells
Three DryCal flow cells cover a broad range: 5 sccm to 50 L/min

Manufactured to ISO 17025 Standards
Guide to Uncertainty in Measurements (GUM) Rigorous uncertainty analysis

Built-in Gas Conversion Capability
Easy conversion from surrogate calibration gasses

Patented Graphite Composite Piston Assembly
Bios DryCal ML-500 eliminates the inherent inaccuracies and mess associated with bubbles and soap, and does NOT require use of mercury seals.

RS-232 PC Data Logging Interface or Internal Measurement Mode
Downloads data directly to a PC

Automatic Sampling
1 to 100 readings as running average (user selected). Repetition rate cane be set as instantaneous or 1 to 255 minutes (user selected).

Built-In Leak Test
Quality assurance self-test allows user to periodically verify flow cell integrity via leak test.

Hands-free Auto-Mode
Flow readings can be taken continuously by the Bios DryCal ML-500 in the auto mode for hands-free operation.

Built-in Parallel Port
Can print directly from ML-500.

NIST Traceable

CE Approved

Weight 7.7 lbs · 3.5 kg

Configuration Interchangeable modular flow cells, all calibrated elements except time base are in cell

Suitable Gases Non-corrosive, humidity less than 80%, non-condensing
Accuracy, Absolute 

Operating Temperature 16° to 30° C for specified Standard Conditions accuracy, to 50° C for specified volumetric accuracy

Time per Reading Approximately 1 to 15 seconds, flow-dependent

Operating Modes Single cycle, continuous cycling or 1 to 255 minute intervals

Measuring Cell Graphite piston in borosilicate glass cylinder. Clearance-sealed

Temperature and Pressure Sensors Solid state, located at entrance to measuring cell

Valve Latching design (to prevent heating of gas stream), self-relieving

Battery System Internal continuously chargeable sealed lead-acid battery

AC Charger/Adapter Choice of 100 VAC, 50Hz or 100 - 125 VAC, 60 Hz or 200 - 240 VAC 50 - 60 Hz 

Note: The standard 120V charger receptacle prongs fit the U.S., Canada, and Japan, while the standard 240V prongs fit much of Europe (with the exception of the UK). For those requiring alternate prongs, there is an adaptable universal charger that will handle voltage from 100 to 240, with interchangeable prongs to fit usage in almost any country available for an additional cost. For pricing information, please contact us. If you wish to receive the universal charger with your DryCal orders, please provide a description or image of the prong requirement.

Outputs Illuminated LCD Display, RS-232 serial port, printer or CSV formats for logging

Warranty Product, 1 year; battery, 6 months

Absolute Accuracy, Single Readings*
 

Flow Cell	Volumetric (5° to 40° C)	Standard Conditions  (15° to 30° C)
ML-500-10	±0.25%	±0.40%
ML-500-24	±0.20%	±0.35%
ML-500-44**	±0.25%	±0.40%
*Averaged readings will increase accuracy
**30-50 slm at ±0.30% volumetric accuracy, ±0.45% Standard Conditions

 
 

Cell Flow Ranges
ML-500-10	5.0 sccm - 500 sccm
ML-500-24	100 sccm - 5 slm*
ML-500-44	300 sccm - 50 slm**
*25-100 sccm with reading time over 30 seconds
**100-300 sccm with reading time over 30 seconds