The Ormity CTI Drop Dispenser is a precision dispensing module designed for controlled drop generation in Comparative Tracking Index (CTI) tests in accordance with IEC 60112.
The system utilizes a single-channel electronic pipette mounted on a rigid mechanical holder, actuated by a micro-stepping motor (NEMA 12) through a PTFE actuator tip. This ensures repeatable, hands-free operation and consistent drop release, eliminating operator variability.
 
Note: The dispenser is intended for integration within CTI test equipment - Dunel or Ormity. Volumetric performance is defined by the electronic pipette; the module serves as the mechanical actuation interface.
 
Applications & Compliance
 
Comparative Tracking Index (CTI) testing.
Proof Tracking Index (PTI) testing.
Electrical insulation material evaluation per IEC 60112.
Compatible with ISO/IEC 17025 laboratory practices.
Volume verification traceable to ILAC MRA (via accredited pipette calibration).
 
Technical Specifications
Dispensing Characteristics
Parameter
Specification
Nominal Drop Volume
20 µL
Verification Volume
25 µL
Drops per Test
50
Total Test Volume
≈ 1.0 mL
Drop Interval
As specified by IEC 60112 (e.g., 30s ± 5s)
Dispensing Mode
Single drop per actuation
 
 
Actuation System
Parameter
Specification
Actuator Type
Micro-stepping motor
Motor Size
NEMA 12
Actuation Method
Linear push on pipette button
Actuator Tip
PTFE (Teflon™) for low friction
Control Interface
External controller / Automated test system
 
Pipette Requirements
To ensure system integrity, the pipette used must meet the following criteria:
Type: Single-channel electronic pipette.
Volume Range: 5 – 50 µL.
Resolution: 0.1 µL or better.
Calibration: Independently calibrated and verified.
The pipette is not supplied as part of the actuator module unless explicitly specified.
 
Mechanical & Environmental Features
Construction: Rigid aluminum column for precise vertical alignment.
Mounting: Custom mechanical holder with adjustable stroke alignment.
Material Integrity: Chemical-resistant materials in contact areas; designed to prevent lateral loads on the pipette piston.
Operating Temperature: 20 ± 5 °C.
Relative Humidity: ≤ 75 % RH (non-condensing).
 
Volumetric Performance
Performance values are dependent on the specific electronic pipette utilized.
Parameter (at 25 µL)
Typical Value
Systematic Error
± 0.25 µL (± 1.0 %)
Random Error
± 0.25 µL (± 1.0 %)
 
 
Maintenance & Calibration
Pipette: Shall be calibrated separately according to the laboratory’s quality system (recommended every 12 months).
Mechanical Module: The holder and actuator are non-volumetric components and do not require liquid-handling calibration.
Cleaning: Use isopropyl alcohol or mild laboratory detergent on external surfaces.
 
Manufacturer: Ormity Inc.