Low Temperature Chest and Upright Freezers, GFL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
GFL deep freezers are equipped with both microprocessor technique and an interface module for monitoring and data recording via PC. RS 422 and RS 485 are optionally available as another two transmission formats. GFL deep freezers are manufactured using only high-quality, stringently tested materials that are particularly suitable for ultra-low temperatures. The units are extremely quiet, have been approved with the CE mark and are maintenance-free. The GFL deep freezer program includes chest and upright freezers with capacities ranging from 30 to 500 liters volume. There are 12 chest freezers with six different volumes, respectively, four Upright Freezers having tow different storage volumes. Both of these products are designed for temperatures of 0°C to -40°C, or -50°C to -85°C in an ambient temperature of up to 28°C: 12 deep freezers with 6 and 6 freezer cabinets and 3 differently sized usage areas (after removing the cover, the under counter deep freezers 6441 and 6481 offers the possibility to store freezing goods directly at the work place. Temperature ranges: 0°C to -40°C and -50°C to -85°C, volume of usage space: 96 litres, 3 drawers with castors). Microprocessor-controlled temperature regulation The microprocessor-controlled temperature regulator, with digital display of actual and set temperature values and digital setting for specified values, operates maintenance-free and is shock resistant. The regulator is battery-buffered by a constantly charged NC battery that maintains the display of the actual temperature and the alarm functions for 60 hours in case of a power failure. During operation on the line the battery level and the set temperature can be checked by touch control. Energy saving deep freezers In compliance with the German Accident Prevention Regulations (UVV). The maintenance-free cooling unit, equipped with fully hermetically sealed high-performance compressors and an air-cooled condenser, ensures short cooling times. Non-flammable refrigerant. The all-around insulation comprises an up to 150 mm thick, seamless and diffusion-protected foamed-in polyurethane layer. This insulation is an essential precondition for energysaving operation. The quietly running compressors only give off around 400 W of heat to the environment at maximum cooling temperature. Ex-proof inside cabinets The inside cabinets are manufactured completely of stainless steel (material No. 1.4301), are corrosion resistant and easy to clean. They are free from ignition sources - an extremely important aspect when storing media with low flash points - and are ex-proof in accordance with BG-I 850-0, version 02/2009. The cooling air outlet is located at the front of the unit, meaning that explosive gases cannot be drawn in when the lid or door is opened. The magnetic sealing system reliably prevents freezing of the lid or door seals. All chest lids are balanced and easy to operate. Chest freezers having a volume of 220 to 500 liters are also equipped with additional insulating cover plates on the cabinet. Upright freezers with storage volumes of 300 and 500 liters are equipped with three inside compartments (H 353 mm), each provided with an insulating door to prevent any loss of cold air. Optional shelves can also be installed in the compartments. On request, the cabinet can also be equipped with a set of drawers instead of the inside compartments. Controlled access The lids and doors of the freezer units can be locked, making unauthorised removal of material impossible. The easy-to-use control panel provides controlled access through the use of a key-operated security switch, ruling out any inadvertent temperature maladjustment. Multiple alarm messages As standard, the deep freezers come with a potential-free changeover contact for connection to an internal alarm system, or to the central I&C system. They are also provided with a connection for a piezoelectric buzzer for simple remote notification of alarms. In the event of a fault (e.g. excess temperature, under temperature, loss of power, sensor break/short-circuit, etc.), an optical and acoustic alarm is issued. The cause for the fault is shown in the display as a defined code number. The limit values for alarms (1 – 20 K), for excess and under temperatures can be set individually by the user. Other optional alarm messages can also be set by the user:
Powder-coated housing Chest freezers 0 to -40°C
Chest freezers -50 to -85°C
Upright freezers 0 to -40°C
Upright freezers -50 to -85°C
1) Sub-counter deep freezer Accessories: Safety cooling systems for chest and upright freezers CO2/LN2 safety cooling system for 230 V a.c. (emergency power) or for battery operation (the supplied storage battery enables operation for approx. 60 hours). Safety cooling systems protect against non-regulated rises in temperature by keeping the temperature in the cabinet constant at a freely selectable value (0 to -70 °C) by controlled injection of LN2 or CO2 when the main cooling system fails. These systems can be installed in chest freezers with a volume of at least 70 liters and in upright freezers starting at a volume of 300 liters storage space. CO2/LN2 bottles not included.
Distribution lines for CO2 safety cooling systems Distribution lines are required of two or three CO2 bottles are connected simultaneously to the freezer unit. The CO2 bottles must be provided with a rising pipe and must not be connected to a pressure limiter. Complete with all materials for assembly and wall mounting. CO2 bottles not included.
Water cooling system/ice water cooling system A heat exchanger is installed in place of the air-cooled liquefier. The advantage here is that the heat exchanger considerably reduces the heat given off by the unit to the environment, at the same time, expanding the permissible ambient temperature range in which the unit can be operated. Water supply is regulated by the freezer. Connecting points on unit: screw fitting for presure hoses ½ inch (not included) with coupling nut. A water cooling system can be installed in GFL deep freezers with a volume of at least 220 liters. Water cooling Ice water cooling
Line recorder For continuous recording of the temperature of the usable space on roll paper. The current measured value is recorded with a constant precision. Designed for continuous operation, with eight selectable paper feeds. Depending on the feed, one paper roll (length 32 m) is sufficient for 2 to 1333 days. For installation in deep freezers with a usable space volume of 500 l (type 6950). When used combined with the other deep freezers, the line recorder is installed in a separate casing (type 6951).
Temperature data logger For external monitoring and recording of the temperature of the usable space. The data logger is equipped with a display, a temperature sensor PT1000 with 3 m cable, adjustable limit value monitoring, adjustable recording intervals, and memory space for up to 60,000 measured values. The data is read out directly to a PC via the USB cable comprised in the delivery. A Windows software (German, English, French) for data logger configuration is likewise enclosed. Calibration of the temperature data logger 6962 at temperature specified by customer, with certificate.
Temperature control For delaying the reaction time of the external sensor in case of temperature change. Aluminium block with several bores for receiving the PT1000 temperature sensor.
Qualification data record Detailed, device-specific record of the spatial and temporal temperature constancy (at a specified temperature). In our premises, the measured data is determined over a calibrated section of measurements and archived for a duration of ten years.
(6) Shelve for upright freezers Upright freezers having a storage volume of 300 and 500 liters come with three compartments as standard equipment. As an option, each compartment can be sectioned with one additional shelf for optimal utilisation of the internal volume of the unit.
(7) Set of drawers for upright freezers The cabinet of upright freezers can also be equipped with a set of four drawers in place of the three insulated compartments. These drawers are made of stainless steel with front panels made of 10 mm thick polystyrene insulating plates. Ball bearings and slide rails ensure easy and level motion.
(8) Storage system for chest and upright freezers Optimised utilization of the storage space is achieved using racks for boxes, microtiter and DeepWell plates. Drawers for boxes
(9) Boxes (130 × 130 mm) with 50 mm and 75 mm high for drawers
Inner dividers for boxes with 50 mm and 75 mm height
Drawers for microtiter and deepwell plates
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