4220 Flow Meter Section 6 Maintenance and Service
6.2.2Regenerating the External Desiccant Cartridge
Teledyne Isco uses two types of silica gel:
•One looks like small beads or pellets that are
•The other looks like coarse sand, yellow when dry, dark green when saturated.
Regenerate desiccant by heating at 212° - 350° (100° - 175°C).
MSDS (Material Safety Data Sheets) for silica gel chemicals are provided at the back of this manual.
CAUTION
There have been reports of irritating fumes coming from the desiccant during regeneration. While our attempts to duplicate the problem have been unsuccessful, we still urge you to use caution.
•Use a vented oven in a
•Do not remain in the room while the regeneration is taking place.
To regenerate the desiccant cartridge:
1.Carefully snap it out of its bracket.
2.Pull the silicone tubing from the end of the cartridge.
3.Remove one of the end caps from the cartridge by twisting and pour the saturated desiccant into a metal, ceramic, or other
4.Identify the desiccant and heat it at the proper tempera- ture two to three hours, or until the blue or yellow color returns.
5.Do not try to regenerate the desiccant inside the cartridge; the cartridge is plastic and will melt.
6.Refill the cartridge with the regenerated desiccant (or with the extra desiccant provided in the accessory package.
7.Replace the end caps.
Notice the filters in the end caps; they keep small pieces of the desiccant material from falling out of the cartridge. You can clean these filters from time to time using ordinary dish soap and water, then allowing to dry.
