Mark 21
Passive QCMs
For situations when temperature control of the crystals is not required, we offer Quartz Crystal Microbalances in two models: The MK19 and MK21 Though they have no onboard heating or cooling features to remotely control the temperature of the crystals, they can be equipped with a temperature sensor if desired.
For situations when temperature control of the crystals is not required, we offer Quartz Crystal Microbalances in two models: The MK19 and MK21 Though they have no onboard heating or cooling features to remotely control the temperature of the crystals, they can be equipped with a temperature sensor if desired.
Introducing
For situations when temperature control of the crystals is not required, we offer Quartz Crystal Microbalances in two models: The MK19 and MK21. Though they have no onboard heating or cooling features to remotely control the temperature of the crystals, they can be equipped with a temperature sensor if desired. These QCMs are often selected when they will be used to record contamination accumulation over the life of flight optics or an orbiting solar panel for example. Sensitivity and total mass to be measured can be optimized for your configuration with a 10MHz or 15MHz crystal selection.
At only 4.0 grams and .402”in length, the MK21 is designed to accommodate customers with size and weight limitations. In contrast, the MK19 has an extra rugged design with larger supporting struts, and can operate at colder temperatures than the MK21. Though light in weight, the MK19 weighs considerably more at ~19.7 grams, though it is more sensitive than the MK21.
To communicate with the CQCMs we have two types of controllers, the M2000 which is designed to work with vacuum chambers in a lab environment, and the M3000 which is designed for flight projects. Both work as a controller and an interface between the customers’ host computer and the QCMs.
Ideal for lab work, QCMs are of a rugged design able to withstand shock and vibration. Flight qualified versions are also available with complete environmental testing to your specifications and have flight history. Contact us to help determine which QCMs best suit your specific requirements.
Specifications
| Sensor Output | Beat Frequency 1 Hz to ~250 KHz (linear), ~650 KHz max. |
| Temperature Range | -268°C (<5K) to +125°C (425K) |
| Signal Amplitude | 6.0V to 10 V peak to peak beat frequency output |
| Voltage Sensitivity | <23 Hz/V |
| Output Impedance | 12KΩ |
| Pressure Range | Ambient to Hard Vacuum |
| Supply Voltage | 9 to 11 VDC (10VDC Nominal) |
| Continuous Power Requirement | 120 mW |
| Peltier Heat Load | No crystal heating or cooling device |
| Temperature Sensor | Included |
| Weight | 4.0 g |
| Field of View | 70.5° Half Angle |
| Crystal Frequencies | 10 MHz Crystals | 15 MHz Crystals |
| Mass Sensitivity | 2.26 x 108 (Hz/gm)cm2 | 5.09 x 108( Hz/gm)cm2 |
| Frequency Range | To ~ 100KHz | To ~ 150KHz |
| Mass Range | 4.42 x 10-4gm/cm2 | 2.95 x 10-4gm/cm2 |
Warranty
QCM Research products are warranted for a period of ONE YEAR from the date of receipt by the purchaser against defects in materials and workmanship. QCM Research expressly limits its liability to the replacement or repair of the article furnished (this choice is at the sole discretion of QCM Research). This warranty does not apply to products that have been disassembled, modified or subjected to conditions exceeding the applicable product specifications and ratings. In the event of any of the foregoing, the warranty will be void. Failure due to excessive contamination is not covered under warranty, whether from proper or improper use. QCM Research disclaims any warranty other than as specifically set forth herein, and may discontinue models or alter their specifications without notice.
