The World's Latest Flame Photometer with Dual Channel Capability
which can measure up to four elements, including Calcium. Building
on the great success of the Model 420 with its Lithium Internal
Standard, fully automatic ignition and optimisation which gives ease
of use and reproducible conditions for high precision measurement,
the versatile Model 425 reinforces Sherwood Scientific as the Leader
in Flame Photometry.
The addition of Calcium allows the simultaneous measurement of
Calcium and Potassium which is of interest to soil chemists. The
model 425 uses an air/propane flame.
One further addition available on the Model 425 is the ability to
interface easily with automated wet chemistry systems as a detector
for Potassium, Calcium and/or Sodium.
The Model 860 Autosampler
The Model 860 has been designed specifically to work with the
Sherwood Flame Photometers. It has separate positions for blank and
standard and in addition can accept 40 samples. The Model 860 is
controlled by the Flame photometer and so no new protocols have to
be involved in its use.
The Model 860 /Model 420 (or 425) system can work at 100 samples
per hour.
Specification
|
Model 425
|
Na
|
K
|
Li
|
Ca
(Using propane/air Flame)
|
Measurement Conc.
range into actual Flame
Clinical mode
|
0- 40 ppm
|
0- 20 ppm
|
0- 100 ppm
0- 1 ppm
|
0- 100 ppm
|
Display range ppm
mmol/l
|
0-199.9
1.00-9.99
10.0-199.9
|
0-199.9
1.00-9.99
10.0-199.9
|
0-199.9
1.00-5.00
|
0-199.9
1.00-9.99
10.0-199.9
|
|
Sensitivity to show 100 units
|
0.5 ppm
|
0.5 ppm
|
0.5 ppm
|
5.0 ppm
|
|
Detection Limit
|
20 ppb
|
20 ppb
|
20ppb
|
0.20 ppm
|
|
Specificity
|
<0.5% interference from an element at the same
concentration of the element under analysis
|
Na Interferes by ~20%
at the same conc. as Ca.
This is linear and can be corrected.
|
|
Linearity
|
± 1% at 50% of displayed value
|
|
