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TEMPERATURE & RH CONTROLLER CUM DATA LOGGER
Version : EC-1P

   
  Introduction
 
This unit is a temperature and R.H. controller cum data logger for stability chambers in a compact 96x96x120mm (LxHxD).
The instrument can be configured to accept a combination of sensors for temperature and RH. For temperature, RTD (Pt-100) or a 0-1 V DC can be selected. For R.H, a 0 –1 V DC or 0 -3 V DC or RTD (Pt-100) for wet bulb can be selected. The indicating accuracy is ± 0.1° C for temperature throughout the operating range (0.0 to 60.0 °C). The control accuracy is better than ± 0.5° C. The indicating accuracy is ± 0.1% for RH throughout the operating range (30.0 to 95.0% RH). The control accuracy is better than ± 3 %. Sensor break indication is provided and is displayed as “OPEN”.

There are 3 control outputs viz: Dry heater, Steam generating heater and compressor. The dry heater maintains the temperature of the chamber. The steam-generating heater maintains the RH in the chamber while the compressor ensures cooling and de-humidifying. The heat control action is a PID on-off type of control with a SSR (solid state relay) drive output. The heater status is shown on the LED marked ‘OP 1’.
The steam control action is a PID on-off type of control with a SSR (solid state relay) drive output. The steam heater status is shown on the LED marked ‘OP 2’.

Alarm set points are provided for both, temperature and R.H. These are self-resetting, differential and float above and below the control set points. Incase, the temperature or R.H process values go beyond these limits, the audio and visual alarms (blinking) are indicated. The ENTER key can be pressed to acknowledge the alarm. The audio alarm is muted but the visual alarm remains till the fault resets.
The compressor control action is on-off type and has a presettable compressor on delay timer (30 to 250 seconds). The compressor can also be configured to be always ON, ON-OFF or always OFF. The compressor status is shown on the LED marked ‘OP3’.

A water level switch can be added to detect low water level in the tank. Incase the low level switch is activated, the steam control is shut off and the audio and visual alarms are indicated.
The controller has a data-logging feature. As such, it can log 6000 lines of record. Each record consists of: DATE TIME TEMP (°C) R.H (%).

The built-in RTC chip keeps time and is backed up by an auto charged Ni-Cd battery cell.
The record is logged at an interval, user programmable from 1 – 99 minutes. The balance records are displayed on the controller in order to take a print out before the 6001st data gets overwritten. To accommodate more data storage, the control set points are not stored in each record. The present temperature and R.H. control set points are printed on the page header. Hence, to avoid any misinterpretation, it is necessary to take a print out before new control set points are entered.
   
 
   
   
 
Contact Details -
Address - VOLT-AMP LOGIC CONTROLS
A/20, Karuna Park, Andheri Kurla Rd., Andheri (E), Mumbai - 400093., Maharashtra, India.
Tel No.- (022) 65221849, Mob. No.- + 91 9819733167