Michell Instruments is the
International leader in the field of moisture and humidity measurement
solutions. With over 30 years of experience, Michell designs and manufactures a
wide range of transmitters, instruments and system solutions capable of
measuring trace moisture, humidity and dew point in a large range of
applications - including many in the pharmaceutical industry.
The
Michell group provides solutions in dew point, moisture and humidity to the
most demanding applications worldwide. Below are a few examples of where our
products can be used in the Pharmaceutical Manufacturing process.
Producing a smooth, even coating on tablets relies on
controlled levels of humidity during the drying process. Basing the drying
cycle on actual levels of moisture in the dryer for producing a high-quality
product as well as saving energy, speeding up production and reducing
waste.
Two sensors are needed for this - one to monitor the air going
into the dryer, the other to measure the moisture in exhaust air leaving the
dryer. The two measurements are fed into the process system, and the drying
cycle adjusted to the optimum time.
A sensor such as Michell's Optidew
high performance optical dew-point transmitter would give drift-free long-term
performance in this type of application. It offers a wide measurement range
from the equivalent of <0.5% to 100% rh at ambient temperatures from
-40°C to +90°C.
Handling powders requires finite control of humidity to
avoid clumping or deterioration. The output of the moisture sensor feeds
directly into the HVAC system and can give warning alarms if the humidity rises
above a certain level. Keeping moisture levels low is also essential to control
bacteria growth.
Michell's range of RH sensors provide a quick and
easy method to monitor the levels of relative humidity during production,
packaging or storage of pharmaceuticals. For greater accuracy, a chilled mirror
product, such as the Optidew, can also be used.
Compressed air is used in a number of
manufacturing processes. Ensuring that the supply of air is dry is essential to
avoid raising moisture levels in the product or the environment as well as
avoiding the growth of bacteria in supply pipes.
The Easidew
transmitter is designed for ease of use, incorporating all the features needed
to make installation and operation as simple as possible as it can be instantly
incorporated into the air management and control system. Low dew point
specifications can be maintained as the sensor is capable of measuring levels
of moisture down to -100°C (>0.14ppmv).
Critical processes, such as manufacturing
pharmaceutical products, require the control transmitters be calibrated on a
regular basis as an FDA requirement. Although Michell offer a full calibration
service for their instruments their range of moisture sensors offers
manufacturers the choice of calibrating sensors in-house.
Michell
Instrument manufactures a range of humidity calibration systems, from simple
bench-top units to PC-controlled humidity chambers.
The Opti-Cal is a
bench-top, fully self-contained humidity / temperature calibrator designed for
users of relative humidity sensors. The system comprises a humidity and
temperature-controlled chamber that can house up to five or more humidity
sensors, depending on their physical dimensions.
The humidity and
temperature within the chamber is closed-loop controlled and continuously
monitored by a precision chilled mirror reference hygrometer. The Opti-Cal
works by time proportioning the flows of dry and saturated air according to the
pre-selected relative humidity value. |
Michell Instruments is the international leader in the field of
moisture and humidity measurement solutions.
The Easidew transmitter is designed for ease
of use, incorporating all the features needed to make installation and
operation as simple as possible as it can be instantly incorporated into the
air management and control system.
A sensor such as Michell's Optidew high performance optical
dew-point transmitter offers a wide measurement range from the equivalent of
<0.5% to 100% rh at ambient temperatures from -40°C to
+90°C.
The Opti-Cal is a bench-top, fully self-contained humidity /
temperature calibrator designed for users of relative humidity sensors.
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