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ATOMIC SPECTROMETRY

Directions

Universal QTA Burner Mount

Part Number B300-0350

For Atomic Absorption Spectrometers

a rb dc

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2/11

Notice

The information contained in this document is subject to change without notice.

Release history

Any comments about the documetation for this product should be addressed to:

User Assistance

PerkinElmer, Inc.

710 Bridgeport Avenue

Shelton, Connecticut 06484-4794

U.S.A.

Or emailed to [email protected]

Notices

The information contained in this document is subject to change without notice. Except as specifically set forth in its

terms and conditions of sale, PerkinElmer makes no warranty of any kind with regaed to this document, including,

but not limited to, the implied warranties of merchantability and fitness for a particular purpose. PerkinElmer shall

not be liable for errors contained herein for incidental consequential damages in connection with furnishing, performance

or use of this material.

Copyright information

This document contains proprietary information that is protected by copyright.All rights are reserved. No part of this document may be reproduced in any form whatsoever

or translated into any language without the prior written permission of PerkinElmer, Inc.

or one of its affiliates.

Copyright 1999 by affiliates of PerkinElmer, Inc.

Produced in Singapore

Trademarks

PerkinElmer is a trademark of PerkinElmer, Inc.

AAnalyst trademark of affiliates of PerkinElmer, Inc.

Registered names, trademarks, etc. used in this document, even when not specifically marked as such, are not to be consid-

ered unprotected by law.

Part Number Release Publication Date

0993-5222 A

B

C

February 1995

September 1996

November 1999 Valid for Software Version 6.5


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0993-5222 3

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Installing the QTA burner mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Remove the burner head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Attach the QTA burner mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Align the QTA burner mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Reinstall the burner head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Installing the heat shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

QTAs for FIAS systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Extinguishing the flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Spectrometers with automatic atomizer changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Universal QTA Burner Mount

Marker for header

Contents page


4/114 0993-5222


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0993-52225

Description

The PerkinElmer Universal QTA Burner Mount is designed to mount the flame-

heated QTA (QTA=quartz tube atomizer) for MHS-10, MHS-15, and FIAS

systems on PerkinElmer atomic absorption spectrometers.

The burner mount installs on the burner head of the AA spectrometer. The QTA

rests in a hinged bracket. When the bracket is in the down position the QTA is

located in the spectrometers sample beam and is heated by the flame. When the

bracket is in the up position the QTA is removed from the sample beam and is not

heated.

Note that the QTA is referred to as the quartz cell or the FIAS-cell in some

publications.

Figure 1. Universal QTA burner mount (shown with MHS-10/15 QTA)

Sample inlet

Hinged QTA bracket(shown in down position)

Burner head

Burner spraychamber

QTA


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60993-5222

Installing the QTA burner mount

To install the QTA burner mount you must remove the burner head, attach the

burner mount to the burner head, and then reinstall the burner head.

Remove the burner head

1. Where applicable, extinguish the flame, allow the burner head to cool, shut

down the gases at source, and bleed the gas supply lines (the correct procedure

is described in the Users Guide for your AA spectrometer).

2. Remove the burner head as described in the Users Guide for your AA

spectrometer.

Attach the QTA burner mount

Note: A heat shield is provided with the QTA burner mount. You only requirethe heat shield if your spectrometer is a Model 3100, 3110, or 3300 (see page 8).

1. Swing the QTA bracket on the burner mount into the up position.

2. Slacken (but do not remove) the two adjusting screws in each securing clamp.

3. Slide the QTA burner mount onto the burner head and position the two

securing clamps over the ends of the burner head. The QTA bracket must be

at the front of the burner head.4. Tighten the adjusting screws, but leave them slack enough so that you can

move the burner mount.

Align the QTA burner mount

1. Swing the QTA bracket into the down position.

2. Visually sight along the burner slot and move the QTA burner mount with

respect to the burner head until the two Vs in the QTA bracket line up withthe burner slot.

3. Tighten the adjusting screws in the securing clamps.

W4.2

Warning: High Temperatures Risk of Burns

The burner head can reach very high temperatures.

Do not touch the burner head until it has cooled to room temperature.


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0993-5222 7

Figure 2. Attaching the QTA burner mount to the burner head

Figure 3. Aligning the QTA burner mount on the burner head

Reinstall the burner head

1. Reinstall the burner head as described in the Users Guide for your AA

spectrometer.

Note: The QTA burner mount can remain permanently installed on the burner

head.

If you wish to change over to normal flame analyses, tilt the QTA bracket to the

up position and park the QTA in the holder at the side of the MHS-10/15 reactor

assembly. Move the reactor assembly away from the immediate vicinity of the

atomizer compartment.

QTA bracketin up position

Securing clamp(1 of 2)

Adjusting screw(2 each clamp)

Burner head

Burner head

seen from the

rear

Burner slot

V in QTAbracket

QTA bracketin down position


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8 0993-5222

Installing the heat shield

If your spectrometer is a Model 3100, 3110, or 3300, you should attach the heat

shield to the burner mount after you have installed the burner mount and

reinstalled the burner head. Refer to Figure 4 while performing the procedure.

Figure 4. Installing the heat shield (Models 3100, 3110, 3300 only)

1. Put the QTA bracket in either the down or the up position.

2. Slide the heat shield onto the QTA bracket so that the slots on the sides of the

heat shield fit on the shoulder screws at each side of the QTA bracket.

Shoulder screw

Heat shield


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0993-5222 9

QTAs for FIAS systems

If you are using the flame to heat the QTA for a FIAS system, use only the QTA

with removable PTFE window assemblies. This QTA has a uniform diameter

along its whole length when the window assemblies are removed. Always remove

the window assemblies before heating the QTA.

Do not use a QTA with flared ends and integral exhaust vents.

FIAS QTA suitable forheating with a flame

FIAS QTA unsuitable forheating with a flame


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10 0993-5222

Extinguishing the flame

When you extinguish the flame after the system has been in operation for several

hours, the QTA is hot and continues to radiate energy until it has cooled down.

Depending on the model of spectrometer, this energy can be detected by the flame

sensor. In this situation it is not possible to continue with flame shut-down

operations.

After a minute or two the QTA has cooled sufficiently and the instrument detects

that the flame has been extinguished. This is not a hazardous situation you must

merely wait for a minute or two for the QTA to cool before you continue with the

shut-down procedure.

Spectrometers with automatic atomizer changeover

Caution: Risk of damage to the instrument

If your spectrometer has automatic changeover between the burner system and

the graphite furnace (e.g. AAnalyst 700 or 800), you can damage the instrument

if you change to the graphite furnace while the QTA burner mount is installed on

the burner.

Before changing atomizers, remove the burner head complete with QTAburner mount from the burner system.


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