26
9
SPECIFICATION
Flowcell mounting: Vertically using the built-in fixing bracket.
Measuring ranges: Minimum Range
0 to 20.0
µ
g/kg,
Maximum Range
0 to 20 mg/kg.
Scaling:
µ
g/kg, mg/kg or ppb, ppm.
Accuracy:
±
5% of reading or
±
1
µ
g/kg, whichever is
the greater.
Response time:
90% of a step change in 1 minute.
Resolution:
0.1
µ
g/kg.
Stability:
±
5% of reading or
±
1
µ
g/kg per week,
whichever is the greater.
Temperature
compensation:
5 to 55
°
C automatic using Pt1000
resistance thermometer.
Salinity correction: preset within the range 0 to 80 ppt.
Barometric pressure
correction:
preset within the range 500 to
800 mm Hg.
Sample flow:
100 to 500 ml/min.
Sample pressure:
Maximum 2 bar.
Sample
temperature:
5 to 55
°
C.
Sensor ambient
temperature:
0 to 55
°
C.
Transmitter operating
temperature
limits:
–20 to 55
°
C.
Transmitter operating
humidity limits:
up to 95% RH non-condensing.
Storage
temperature limits—
Flowcell:
–25 to 70
°
C.
Sensor:
0 to 55
°
C.
Transmitter:
–25 to 70
°
C.
Set Points and Relays—
No. of set points: two.
Set point
adjustment:
programmable.
Set point
hysteresis:
±
1% of f.s.d. (fixed).
Local set point
annunciation:
red l.e.d.
No. of relays:
two.
Relay contacts:
single pole changeover.
Rating:
250 V a.c.
250 V d.c. maximum.
3 A a.c.
3 A d.c. maximum.
Loading:
(noninductive)750 VA
30 W maximum.
(inductive)
75 VA
3 W maximum.
Retransmission—
No. of retransmission
signals:
one, fully isolated.
Output current:
0 to 10, 0 to 20 or 4 to 20 mA
programmable.
Maximum load
resistance:
750
Ω
(20 mA maximum).
Serial
communication: RS422/RS485 (optional).
Transmitter display—
Measured value: 5-digit x 7-segment back-lit l.c.d.
Information:
16-character, single line, dot matrix
back-lit l.c.d.
Insulation, contacts
to earth:
2 kV r.m.s.
Power Supply
Voltage requirements:
100 to 130 V or
200 to 260 V 50/60 Hz.
Power
Consumption:
< 10 VA.
Error due to power
supply variations: less than
±
2% for +6% –20% variation
from nominal supply voltage.
Insulation, mains
to earth:
2 kV r.m.s.
Protection—
Flowcell:
IP65.
Transmitter—
Model 4641: IP66.
Model 4646: IP66 front.
Mechanical Data
Mounting:
Model 4641 wall mounting, Model 4646
panel mounting.
Overall dimensions—
Flowcell
(without unions): 97 mm x 80 mm x 108.6 mm.
Transmitter—
Model 4641: 160 mm x 214 mm x 68 mm.
Model 4646: 96 mm x 96 mm x 191 mm.
Panel cut-out: 92 mm x 92 mm.
Weights—
Flowcell (with
sensor fitted):
0.75 kg.
Model 4641:
2 kg.
Model 4646:
1.5 kg.
