Page 11 - Shimadzu AA-6880

$$ Power Supply, for Unique Advanced Safety Technology

High-Performance Boosted Hollow
Cathode Lamp Included as Standard Comprehensive Safety Functions in Every System
Safety is an extremely important consideration for flame atomic absorption
spectrophotometers using acetylene gas.
The AA-6880 Series instruments incorporate a comprehensive range of safety
Excellent Lamp Sockets Design mechanisms, including gas leak detectors.
The AA-6880 lamp house has an 8 lamp turret with an automatic switching function, where the No. 7 and No. 8 lamp holders can be
used for both an ordinary hollow cathode lamp and a high-performance boosted hollow cathode lamp. The AA-6880 can
simultaneously light any two hollow cathode lamps.
For the high-performance boosted hollow cathode lamp, an auxiliary cathode electrode is added based on two ordinary hollow
cathode lamps. The atoms will be produced under the sputtering action in the hollow cathode due to discharging between the
hollow cathode and the anode. The low-voltage high current between the anode and the auxiliary cathode provides excitation
energy for the atoms, and such sputtering action and excitation action will be respectively controlled by two separate discharge Safety Functions for Flame-Specification Instruments
processes. This greatly improves the excitation efficiency of the atomic spectrum. The high-performance hollow cathode lamp
requires a dedicated power supply. Multimode automatic gas leak check
The fuel gas pipes inside the instrument gas controller are automatically checked for gas
leaks when the power is turned on and when the flame is extinguished. Should a gas leak be
detected, a warning buzzer sounds and a warning is displayed on the screen.
Automatic flame ignition and extinguishing
Flame ignition and extinguishing operations are extremely simple. The Air-C2H2 flame priority
Unique Lamp Power Design ignition mechanism prevents flashback.
The AA-6880 main unit has a built-in high-performance boosted hollow cathode lamp power supply. Automatic Air-N2O switching system with acetylene flow-rate monitor
Two high-performance hollow cathode lamps can be simultaneously illuminated without any external power supply. After the ignition of an Air-C2H2 flame, the flame automatically switches to an N2O-C2H2
An auxiliary cathode current can be automatically scanned, which only requires optimizing the test conditions. flame.
If the C2H2 flow rate does not increase due to solenoid valve trouble, for example, switching
to the support gas is disabled to prevent flashback.

Pressure monitor prevents flashback Automatic gas shut-off by flame monitor
Sudden power interruption detection and re-ignition safety measures Mechanism to prevent misuse of the burner
Main Features of High-Performance Boosted Hollow Cathode Lamps Drain tank level monitor
(as Compared with Ordinary Lamps):
Safety Functions for Furnace-Specification Instruments
High emission intensity and good stability
High measurement sensitivity and low detection limit Cooling water flow rate monitor Argon gas pressure monitor Furnace cooling check
Expanded calibration curve linear range Overcurrent protection unit (double-checked by circuit protector and optical sensor)
Reduced spectrum interference from adjacent lines, so a larger spectral bandwidth can be used to further improve Design for preventing miss-ignition
the energy. In general, the electrodes of the high-performance boosted hollow cathode lamp, made by
low-melting-point and volatile elements,such as As, Bi, Pb, Sb, Se, Zn, etc., show better application results..
Safety-Conscious Design
Flame-retardant materials Safe ignition switches
Air-Acetylene Air-Acetylene Graphite Graphite UL 94V-0-rated flame-retardant materials The switches perfectly fit finger contours and are positioned
Flame Analysis Flame Analysis Furnace Analysis Furnace Analysis are used for the instrument external near the window.
covers and atomizer unit. This superior To prevent inadvertent operation, both switches must be
Ordinary Hollow High-Performance Hollow Ordinary Hollow High-Performance Hollow
Element design pays due consideration to safety. pressed simultaneously to start ignition.
Cathode Lamp Cathode Lamp Cathode Lamp Cathode Lamp
Detection Limit Detection Limit Detection Limit Detection Limit
(µg/mL) (µg/mL) (pg) (pg)
Pb 0.0279 0.0149 0.68 (10 µL) 0.42 (10 µL)
Zn 0.0019 0.0010 0.055 (20 µL) 0.025 (20 µL) Durable pipes and reliable couplings Clear window
All pipes are selected for durability and The large window permits observation of the flame, and the
Pb and Zn: Comparison Table for Typical Detection Limits of the High-Performance Boosted Hollow Cathode Lamp and the Ordinary used with highly reliable couplings. burner can be easily accessed through the large opening.
Hollow Cathode Lamp The window closes when released to eliminate the chance
of it being left open.

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