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Table of Contents
Related Manuals for scigiene AW1
Summary of Contents for scigiene AW1
- Page 1 User Manual Humimeter AW1 Meter 2018...
- Page 2 User manual - Definitions Water Activity: Water activity or aw is the partial vapor pressure of water in a substance divided by the standard state partial vapor pressure of water. In simplified terms, aw is the measure of “free” water in food or other product of interest that is available to support the growth of microorganisms including spoilage organisms.
- Page 3 Detailed definition of Water Activity: Water activity or a is the relationship between the partial water vapour pressure in food (p) and the saturation vapour pressure of pure water (p0). It is an important indicator for product quality in the food, tobacco and pharmaceutical industry and is indicated in an a value from 0…1.
- Page 4 Minimum water activity: Water activity Organism aw = 0.91...0.95 bacteria aw = 0.88 yeasts aw = 0.80 moulds aw = 0.75 halophilic bacteria aw = 0.70 osmiophilic yeasts aw = 0.65 xerophilic mould Typical moisture sorption isotherms of different food and materials from the literature 25.00 24.00 ceramic powder...
- Page 5 Calibration curves measuring calibration curve description unit range value water activity 0 to 1 rel. humidity rel. air humidity 0 to 100% -55 to +60°C dew point dew point °C / °F -67 to 140°F abs. humidity abs. air humidity g/m³...
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Page 6: Application Range
Application range Within the normal application range (normal range) the accuracy of the device is as indicated. A long-term application beyond the normal application range (max. range), particularly at an air humidity of more than 80%, can lead to higher measuring errors (+3% after 60 hours). Back in the normal application range, the sensor will return to the indicated accuracy automatically. -
Page 7: Design Of The Device
Design of the device Options Connection To sensors calibration measurement curve temperature selection of sensor type ON/OFF button batteries slot (flipside) Sensor Aw Sensor (Part#: HM- 13700) Connecting Plug Air Humidity & Precision Rel. Humidity Moisture & Temperature Temperature Sensor &... -
Page 8: Menu Level Overview
Menu level overview Keypad symbols Measuring window: Type selection menu Rolling Menu Power ON / OFF Next calibration curve Switch upper Previous calibration curve Switch lower Power off Save Store menu Hold Autolog Show last log Watch saved data Store new log Enter Power off supplier´s data... -
Page 9: Operating The Instrument
Operating the instrument Switching on: Press for three seconds. Changing the calibration curve: - Options – date / time Setting date and time: two times Set date and time using the button , according to the format indicated (JJ.MM.TT). After entering the year, press the button for entering the month and again for entering the day. -
Page 10: Transfer Saved Data To The Pc
USB port on your PC. Start the LogMemorizer software on your PC and switch on your humimeter AW1. The data transfer can be started on your humimeter or on the software: Starting data transfer on the humimeter:... -
Page 11: Print Saved Data
Print saved data (NOTE: Only applicable if the HM-11733 Thermo Printer is ordered) To print your saved data, connect the device to the printer using the printer cable that was delivered with your device: Carefully loosen the protection cap on the humimeter. At first plug in the side of the connector with the close plastic casing on the humimeter ( DO NOT PLUG IN OTHER SIDE INTO THE... - Page 12 For a rapid conditioning, the water activity measuring chamber is equipped with a ventilator. If the humimeter AW1 basic device is switched off, the conditioning time is extended. In case of using the automatic datalog with a datalog time of more than 30 seconds, the device switches off automatically between the measurements.
- Page 13 Steps To “Real” a Step 1: Insert Sample into AW Cup Step 2: Grind / Homogenize Sample Step 3: Close AW Cup Step 4: Turn on to Log Readings To Stability; typically < 5 minutes...
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Page 14: Checking Calibration
Checking Calibration In order to avoid the impairment of the measuring accuracy due to pollution or a drift of the sensor by aggressive gases, we recommend a periodical calibration check of the water activity measuring chamber with certified calibration standards. The check should be effected in the smaller sample cup and in the approximate normal scope of application. -
Page 15: Single-Point Adjustment With 50% Humidity Standard
(http://www.scigiene.com/SC-AW3650) Preparation To ensure proper results it is essential that the components of the calibration equipment have approximately the same temperatures. The best way to do that is to leave the calibration components at room temperature (+20°C to +25°C) for at least 60 minutes (or more if you have time available). - Page 16 If the meter reads within the tolerance of standard solution +/-0.02 (i.e., Aw between 0.734 and 0.774), then Adjustment/Recal is not required. If it differs from that tolerance range, we recommend carrying out a recalibration as follows (next page): Single Point Adjustment using 0.500 Aw Standards: 1.
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Page 17: Offset Adjustment
Assembly of calibration equipment for Probe Sensors Only 1. Push in the sensor completely into the upper part. 2. Lie in the textile pad in the bottom part of the calibration device, and pour the humidity standard carefully at the textile pad. 3. -
Page 18: Reset To Factory Calibration
5. Enter the main user password using the buttons resp. and confirm by pressing . The main user password after consignment is the serial number of the device, shown on the display after switching on the device or in menu item Status. -
Page 19: Care Instructions
0.5% per year. You can check instruments of the humimeter AW series by yourself using the calibration equipment (see optional accessories). For a fee, Scigiene can also carry out a calibration in their test lab. On demand, you will also receive a calibration... -
Page 20: Exemption From Liability
IMMEDIATELY. Also if you do not use your humimeter device for a longer period, remove the batteries. For resulting damages, we cannot provide any warranty. In case of a faulty device, please contact Scigiene Corporation at 416-261-4865 or www.scigiene.com. -
Page 21: Important! Please Read
!IMPORTANT! Please read! Common reasons for incorrect measurements Sunlight or other sources of heat or cold that doesn´t correspond to the surrounding temperature (See AW options) Dripping or sprayed water Irreversible damage of the sensor due to aggressive gases ... -
Page 22: Technical Data
Technical Data Water Activity (AW1) Measurement: Sensor Measuring Range Resolution Accuracy Water Activity (A 0.03 to 0.98 aw 0.001 a 0.10 to 0.80 +/-0.01 a Rel. Humidity 0 to 100% RH 0.1% 0 to +50 °C / 32°F Temperature °C / °F to 122°F...