Transcript
Technical Tip T80
DryVap™ Immersion Heater Cleaning or Replacement The heater is used in the concentration process. The heater includes an internal thermocouple located just above the 90 degree bend of the heater. The heater automatically turns off when the solvent level drops below the thermocouple and the DryVap operating system senses a temperature increase. If the Heater Timer function is used, the heater will automatically turn off based on the timer setting. The heater is coated with Siltek®/Sulfinert® to provide maximum inertness. Rinsing a heater immediately after running a dirty sample will minimize build-up of organic deposition. Based on the cleanliness of the samples, it might be necessary to periodically clean the heaters.
Caution: The DryVap immersion heaters get very hot during operation.
NOTE:
NOTE:
These figures show damage to the Siltek®/Sulfinert® coating surfaces, the result of aggressive chemicals such as strong acids like hydrochloric and sulfuric acids. Do NOT use these chemicals on the DryVap system.
When cleaning a Siltek®/Sulfinert® treated part, rinse with a solvent compatible with the contaminants you intend to remove (i.e., use non-polar solvents with hydrocarbon surface contaminants, more polar solvents with more active contaminants). Do not use basic solutions with pH>8. DO NOT use any abrasive cleaners or rough paper to rub or clean the heaters. This could damage the Siltek®/Sulfinert® coating, exposing an active surface site on the heater. Mild ultra-sonic action may assist in contaminant removal, but do not over sonicate, this could damage the treated surface.
Cleaning Immersion heaters TOOLS:
• • •
KimWipes® (or similar laboratory wipes) Small/tooth brush Baking soda (Sodium bicarbonate)
• • •
Methanol Distilled water Nitrile gloves
1.
The heaters can be cleaned by using a KimWipe which has been wetted with methanol. Simply wipe the heater with the wetted KimWipe.
2.
If organic material has carbonized onto the heater surface and does not readily come off with a methanol dampened KimWipe, then cleaning with baking soda is required.
TT80 Rev B 23AUG10
Page 1 of 4
Horizon Technology, Inc. 45 Northwestern Drive
[email protected]
Salem, NH 03079
[email protected]
Tel: +1.603.893.3663
Fax: +1.603.893.4994
www.horizontechinc.com
Technical Tip T80
3.
Cover the cradle when cleaning heaters, to keep the sensors and the tube flag clean of debris and solvents from the heater cleaning process.
4.
With a soft toothbrush dipped in a baking soda/distilled water solution, use a gentle brushing action to loosen the material.
5.
Rinse the heater well with distilled water to remove the baking soda.
NOTE: 6.
DO NOT leave the baking soda on the heater coils for any extended period as the paste is slightly alkaline and will slowly attack the Siltek®/Sulfinert® coating. If a toothbrush is not available then put some baking soda in one pan and some distilled water in another pan. Wearing Nitrile type gloves, wet your pointer finger with the water and then contact the baking soda to make a firm paste. Gently rub the paste on the heater coils. Use a folded KimWipe to access these tight regions of the heater coil. Rinse well with distilled water to remove the baking soda.
NOTE:
DO NOT leave the baking soda on the heater coils for any extended period as the paste is slightly alkaline and will slowly attack the Siltek®/Sulfinert® coating.
NOTE:
DO NOT use any abrasive cleaners or rough paper to rub or clean the heaters. This could damage the Siltek®/Sulfinert® coating, exposing an active surface site on the heater.
Replacing Immersion heaters Important: TOOLS: NOTE:
When ordering replacement immersion heaters, check under the lid cover (see step 1) determine the wiring connector type. See table 1 below to select heater reorder number. • •
•
Philips Head Screwdriver Bladed Screwdriver
Long Nose Pliers
Make sure the DryVap system is turned off and unplugged.
1.
Remove the cover: Unscrew knob and remove the two screws, then lift the lid cover
2.
Remove the screw that holds the retaining clip. Slide the retaining clip off the heater top.
TT80 Rev B 23AUG10
Page 2 of 4
Horizon Technology, Inc. 45 Northwestern Drive
[email protected]
Salem, NH 03079
[email protected]
Tel: +1.603.893.3663
Fax: +1.603.893.4994
www.horizontechinc.com
Technical Tip T80
Table 1: Select Heater Type / Item Number Heater Item Number
Replaces
Wiring type
Heater type
(includes FEP O-ring)
50-1751A
50-1658A (original version)
50-1751 50-1658
2 Connectors
Spiral
3 Connectors Separate red and white thermocouple wires with pin connectors
Serial No. 1107 – 1200
Spiral
3 Connectors 50-1658-01
50-1751-01
Ring
Separate red and white thermocouple wires with pin connectors
50-1751A 50-2755
Serial No. 1200 +
Ring
2 Connectors
3.
Detach the wiring connectors for the black pair of wires and the red/white pair.
4.
Hold the heater shaft from below the station lid and gently push up the heater so that the O-ring pops out of the lid body. A pair of tweezers may be required to pull the O-ring out of the lid body.
1.
Wrap the identification label around the wires and work the O-ring to the end of the wire connectors and remove O-ring.
2.
Gently pull down on the heater and at the same time, slowly rotate it back and forth. Once the heater is free, pass the wiring connectors, one at a time, through the heater body.
3.
Installing the new heater: Wrap the identification label around both sets of wires and feed one wiring housing at a time up through the Lid body.
4.
Place a new O-ring on the end of a set of needle-nose pliers and slightly stretch the O-ring by opening the pliers. Caution: Do not over stretch the o-ring. The FEP covering could be damaged. Feed the O-ring over the wiring connectors, one at a time, then pass the O-ring over the head of the heater. Gently work the O-ring into the seat (see illustration in step 4).
TT80 Rev B 23AUG10
Page 3 of 4
Horizon Technology, Inc. 45 Northwestern Drive
[email protected]
Salem, NH 03079
[email protected]
Tel: +1.603.893.3663
Fax: +1.603.893.4994
www.horizontechinc.com
Technical Tip T80
5.
Gently insert the heater head into the lid, and then align the notches on the side of the heater head for the insertion of the retaining clip. Slide the retaining clip past the notches on the heater head and secure the retaining clip screw.
6.
Connect the Black wire connection (heater power). Connect the red/white wire connection(s) (thermocouple). White to white and red to red. Carefully fold the wires and label inside the lid assembly so that the lid cover can be screwed back on without pinching any wires.
7.
Reattach the station lid cover and knob.
NOTE:
Each heater has its own unique heater offset value (T13), the new heater must be recalibrated using the learn mode and the desired solvent. The new heater label includes the T13 value. This valve can be entered into the DryVap system using the optional DryVap software.
Other Replacement parts available from Horizon Technology Inc. See Table 1 for selection of correct heater item number 35-1926-01
O-ring, FEP encapsulated, Heater
1 per heater
01-1892
Clip, Heater
1 per heater
02-1819
Top Cover, station Cap
1 per station
02-2003
Knob, (non-metallic) Station Cap
1 per station
50-2355
DryVap Software
Note:
Note:
KimWipes are a type of cleaning tissue commonly used in laboratories. As a result of the removal of chemical additives, the paper is not as soft as a facial tissue, however, this lack of additives makes them ideal for clean wiping of laboratory equipment. SilcoNert™ 2000 (Siltek®/Sulfinert®), made by Silcotek was formerly a division of Restek, is a passivation of treated surfaces. A required treatment for metal components when analyzing for partsper-billion levels of organo-sulfur compounds & mercury. It greatly reduces moisture contamination and improves system performance. SilcoNert™ 2000 surface treatment eliminates surface adsorption of active compounds on steel, glass, ceramic and carbon surfaces.
TT80 Rev B 23AUG10
Page 4 of 4
Horizon Technology, Inc. 45 Northwestern Drive
[email protected]
Salem, NH 03079
[email protected]
Tel: +1.603.893.3663
Fax: +1.603.893.4994
www.horizontechinc.com
