Digox 601 silica
The determination of dissolved silicic acid (ortho-silicate) in the water-steam cycle is of great importance for the operation and plant safety in power plants. In addition to the determination of ortho-silicate in the live steam, it is possible to detect, above all, a breakthrough in the anions and blending bed exchanger.
The chemical measuring method of dissolved silicic acid complies with the VGB guidelines. This is a photometric procedure which is suitable for the determination of silicic acid in low-ionic power plant waters.
TECHNICAL FEATURES
Very low reagent consumption
No sampling pump or waste water pump necessary – therefore, less maintenance
Individually selectable measuring frequency for each channel in a time frame of 12 minutes up to 96 hours
Blank value determination
Measuring range:
Photometer:
Display:
Accuracy:
Determination limit:
Repeatability:
Calibration:
Reagents:
Reagent consumption:
Data interface:
Alarm outputs:
Operation:
Analogue outputs:
Response time:
Ambient temperature:
Relative humidity:
Sample conditioning:
Sample path:
Safety:
Power supply:
Protection class:
Weight:
Dimensions:
0 – 500 ppb SiO2
Precision photometer with temperature control of the sample
Graphic display, measuring value for each channel with point in time and operating condition
/- 4% of reading or /- 0.5 ppb
Below 4 ppb
/- 2% of reading or /- 0.3 ppb
The two-point calibration is realised with an integrated ionic exchanger
Three times 2.5 l reagents, 0.25 l standard solution 2000 ppb SiO2
0.5 ml per analysis operation, change of reagent after approx. 6 weeks with an analysis frequency of 12.5 minutes
RS 232
Two for threshold values and accumulative error message, optional add-on of four outputs Max. 250 VAC/3 A, max. 24 VDC/3 A
Password protection for the menu-led entry of threshold and calibration values, communication parameters, programming of calibration and measuring cycles
Two 0(4)…20 mA, max. apparent ohmic resistance 500 Ohm, can be upgraded up to six analogue ouputs
12.5 minutes analysis duration
5 – 40 °C
30 – 95 %
At least 1.0 – 3 bar, 10 – 20 l/h, 40/50 °C
Two sample channels. Can be upgraded as an option up to six sample paths with back
pressure measurement and automatic constant. Additional laboratory sampling is possible.
Automatic monitoring of samples and reagent liquid. No discharge of reagents when changing the hose
110/240 VAC 50/60Hz, 85VA, parameter back-up without batteries
IP 65
35.0 kg
700 x 500 x 280 mm (H x W x D)