The document describes a Chemical Oxygen Demand (COD) Digester system that consists of an electrically heated metal block with at least 15 holes to hold 100ml reaction vessels for digesting water samples, a cooling tray, and an air cooler stand. The system has a temperature range up to 400°C with a digital display, and includes 30 extra reaction vessels, air coolers, adjustable reagent dispensers, and operates on 220VAC power.

1. Chemical Oxygen Demand (COD) Digester
Purpose
To digest water samples for COD measurement
Specifications:
Brief Description of the
System
• The digester will be used for potassium dichromate - sulphuric
acid digestion of water/waste water samples
• Should consists of an electrically heated (220 ± 10 volts/50 Hz
AC power) metal block thermostat having atleast 15 holes to take
the reaction vessels, 15 reaction vessels, a cooling tray, and an air
cooler stand for 15 air coolers
• The capacity of these reaction vessels should be atleast 100 ml
each
• The heating with thermostatic control should provide a
temperature range of upto atleast 400 o
C, and builtin timer with
signal
Temperature sensor • Probe with digital display and calibrated from NABL Accredited
Laboratory
Power Supply • 220 VAC ±10%, 47 to 53 Hz
Additional Items to be
Supplied
• Should be complete with 30 extra reaction vessels and 30 air
coolers, power cord and plug, and adjustable automatic dispensers
2 each of 1-10 ml, 2-20 ml, and 5-30 ml capacities for reagents
additions