TECHNICAL DETAIL
The Chamber shall be fabricated with high standard, high quality of finish, which matches the performance with emphasis on reliability and economy of use. The use of the most up to date Eurotherm 2604 programmable PID Controller, Rotronics Temperature Humidity Probe, aSENSE CO2 Transmitter, shall make it Corrosion Free MS Powder Coated Exterior to enhance any test facility.
Internal dimensions: 600mm X 600mm X 600mm ; Volume : 210 Ltrs. Temperature Range:+10 OC to +60OC,
Temperature Measurement Accuracy : +/- 0.1 OC
Temperature Control Accuracy : with in +/- 1 OC after stabilization Humidity Range (RH) : 40% to 95% RH, ± 2% in standard temp range, limited to a dew point of 4degC. ( Refer Graph provided at the last ) Humidity Measurement Accuracy : +/- 1% RH
Humidity accuracy at control point during the dwell after stabilization within
+/-2 %RH
Humidity distribution of the empty chamber after stabilization with in +/- 1.5% RH
CO2 Measure and Control Range % Conc : 0 to 10% ( aSENSE CO2 Sensor with automatic baseline Correction would be used )
Flexibility to set between Ambient 0.035% to 10%
Humidifier system : Air Atomizers for Humidification, Warm water vapor generator,
complete with blowing system, heating and over-heat safety system. Rotronics Direct measurement Platinum Resistance type sensors shall used for the measurement and control of the Humidity
Air Compressor with refrigerated drier provided with the equipment will
produce precise humidity control and low temperature, low humidity
environments in the chamber.
CO2 Purging and Control System : A CO2 purging valve assembly is provided for the purging of CO2 inside the chamber. aSENSE CO2 Transmitter detects the CO2 level in the air (0-10% Concentration) and gives a 4-20mA output to control the opening and closing of the purging valve, to maintain the set concentration level. Spec. of CO2 Transmitter and Controller attached in the proposal Double Stage Chrome Plated Brass regulator with Pre- heater for CO2 Cylinder will provide smooth purging of CO2 in the Chamber. (C02 Cylinder will be in Buyer Scope )
Heating System: Inconel sheathed type evenly spaced in the annular space surrounding the
working volume.
Refrigeration Unit: Single Stage Copeland/Danfoss make Air Cooled Condenser System, complete with Compressor, Condensing unit, and CFC free refrigeration gas will be used
Finish: 18SWG MS Powder Coated Exterior Finish and 16SWG SS304 Interior with
Full TIG Welding for Vapor Tight Finish.
Door Assembly and Viewing window : Door System with full front opening type, compensating hinges with locking mechanism. Incorporated in the centre is the 400 X 400mm 5 Pane viewing window, with the whole being insulated with non-flammable Rock-wool and with an exterior finish, matching the main cladding.
Viewing window will be provided with light. Interlock protection will be provided for opening of door.
Insulation : Non-flammable 96Kg/m3 Density Rock wool 100 mm thick
Fan system : High performance externally mounted, flange-mounted motor drives internal fan through extended stainless steel shaft.
Controller system : The Eurotherm 2604 high performance Multi Loop PID Controller or equivalent shall be used. Over and under temperature indicator shall be of standard make.
Main Features of the controller shall be
•PC interface – with remote logging inclusive of acquisition and configuration software
•High Stability Control & High Precision input
•Real time clock.
•High accuracy, high stability temperature and process controller
•Dual 7-segment display (5 digit) of the process value and set point
•Advanced control algorithm gives stable straight line control. Automatic tuning simplifies the commissioning procedure by performing a one shot tune to calculate the optimum PID and cutback valves for each loop and further optimize each control loop, gain scheduling can be used to automatically transfer control between up to three sets of PID values.
•Incorporates a self-correcting input circuit (INSTANT ACCURACY) to preserve & maximize the accuracy, performance during warm up and change in ambient temperature.
Display : The Eurotherm Controller will show measured variable and set value
in OC, and humidity in % RH and CO2 in % Concentration
Construction : The chamber will be manufactured from high quality materials and standard components. The chamber will be fabricated from 18SWG MS. Powder Coated Material on the outside with a 16SWG SS304 bright interior. The stainless steel work is rigidised with mild steel sub frame.
Safety features
•Door Interlock
•Input supply variation >10%
•Under & over temperature protection
•Circuit breaker
•Thermal overload relay for Fans and Compressor
•Safety alarm for chamber malfunction
Calibration :Calibration certificate will be issued which has traceability to NABL for the complete system. Original calibration certificate of the Sensors used, which has international traceability, will also be supplied along with the system.
Other features :
•Drain for condensate and cleaning water will be provided.
•External Storage tank for DM/Distilled Water will be provided
•Earth point will be provided
•The power consumption by safety & control devices will be as low as possible.
•Energy efficient motors will be used (Siemens/Alstom).
•All the electrical items used shall be of std IP 55grade suitable for
•Humidity chamber ( Schneider Electric )
•All the switch gears and MCB’s used in the construction shall be of high quality reputed brands.( Schneider Electric- Telemechanique, Merlin Gerin)
•Noise Level of the chamber shall be with in 70dBA measured at 1Mtr distance
Electrical Supply: 415 VAC ±10%, 3 Phase, 50 Hz + N + E |
