Oval EL4301, Instructions Manual

Page: 22 / 24

E-886-2-E
12.4 EL4331 Density Computer for Spool Densitometer (liquid service)
Table 12.4
Item Description
Input
signals
Temperature input
Resistance thermo-
meter bulb
Pt 100 Ω at 0 ° C, 3-wire system Rated current 2mA
Analog 4 to 20mADC or 1 to 5VDC
Pressure input 4 to 20mADC or 1 to 5VDC
Density input Density period signal Pulse period 162 to 650 μ s
Supply
power
To densitometer preamp 28VDC 30mA
To pressure transmitter 24VDC 30mA max.
Output
signals
Corrected density
4 to 20mADC (Max. load resistance 500 Ω ) or 1 to 5VDC (Output impedance
250 Ω ) Conversion accuracy: ± 0.1% of F.S.
Alarm output Static relay Capacity: 230VAC/340VDC 0.2A
Conversion accuracy ± 0.2% of span ± 0.06g/l
Display type
Display: ST display (128 × 128 dots), backlighted ( ※ 1), ( ※ 2)
Information displayed: Data, units, error message simultaneously
Menu
Items
Density before correction To the 3rd decimal place (when g/l is selected.)
Corrected density To the 3rd decimal place (when g/l is selected.)
Density period To the 3rd decimal place (when μ s is selected.)
Temperature To the 2nd decimal place (when ° C is selected.)
Pressure To the 4th decimal place (when MPa is selected.)
Molecular weight To the 3rd decimal place (when g/mol is selected.)
Specific weight To the 3rd decimal place
Error alarm Number of errors ＋ error messages
Com-
puting
range
Temperature
Pt 100 Ω at 0 ℃
Range: － 20 to 75 ° C
Std. Span: 70 ℃
4 to 20mADC or 1 to 5VDC Std. Span ： 200 ℃
Pressure 0 to 3MPa Standard span 1/2P
max
. to P
max
, 1/5P
max
. to P
max
.
Density 0 to 60g/l
Com-
puting
accuracy
Corrected density ± 0.1% of span ± 0.006g/l
Temperature
Pt 100 Ω at 0 ℃ ± 0.3% of span
4 to 20mADC or 1 to 5VDC ± 0.1% of span
Clock IC battery backup Lithium battery Battery life: 10 years approx.
Communication (when communica-
tion interface is provided.)
Interface: RS485 Multipoint (Up to 16 units can be connected.)
Dedicated protocol Baud rate: 4800 bps standard 9600 bps max.
Transmission cable
Use 3-conductor shielded cable to the resistance thermometer bulb.
Loop resist. 5 Ω max. Example: 300 meters max. with 3-conductor 1.25mm
2
cable; 500 meters with 2.0mm
2
cable
Power source 85 to 264VAC, 50/60Hz or 20 to 30VDC
Power consumption 20W max.
Ambient temperature － 10 to ＋ 50 ° C
Mounting Panel mount
Finish Munsell N1.5
Weight 2.5 kilograms, approx.
NOTES ( ※ 1): ST display stands for Super Twisted Nematic display.
( ※ 2): Backlight life (luminance declined to one half its original luminance): 2500 hours, approx.