Specifications; Measurement Performance; Electrical: Input/Output; Mechanical - Walchem WDT400 Series Instruction Manual

Dual cooling tower conductivity controller
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2.0

SPECIFICATIONS

2.1

Measurement Performance

2.2
E lectrical: Input/Output
Input Power
Input Signals
Flow Meter (0, 1 or 2 optional)
Flow Switch (0, 1 or 2 optional)
Outputs
4 - 20 mA (0,1, or 2 optional) Fully isolated
Agency Approvals
Note: For EN61000-4-6, EN61000-4-3 the controller met performance criteria B.
*Class A equipment: Equipment suitable for use in establishments other than domestic, and those directly
connected to a low voltage (100-240 VAC) power supply network which supplies buildings used for
domestic purposes.
2.3
M echanical
Graphite electrode pressure rating
Flow switch manifold pressure rating
Flow switch manifold connections
Conductivity Range
Conductivity Resolution
Conductivity Accuracy
Temperature Range
Temperature Resolution
Temperature Accuracy
100-240 VAC, 50/60 Hz, 8A
Fuse: 1.0 ampere, 5 x 20 mm
Conductivity Electrode
1.0 cell factor, 10K thermistor
Isolated, dry contact closure required (i.e. relay, reed switch)
Isolated, dry contact closure required (i.e. reed switch)
Mechanical Relays (5) Pre-powered on circuit board switching line voltage
6 A (resistive), 1/8 HP
All relays are fused together as one group, total current for this
group must not exceed 6A
600 Ohm max resistive load
Resolution .001% of span
Accuracy ± 1% of reading
Safety UL 61010-1:2012 3rd Ed.
CSA C22.2 No. 61010-1:2012 3rd Ed.
IEC 61010-1:2010 3rd Ed.
EN 61010-1:2010 3rd Ed.
EMC
IEC 61326-1:2005
EN 61326-1:2006
Enclosure Material
NEMA Rating
Dimensions
Display
Operating Ambient Temp
Storage Temperature
0 - 10,000 µS/cm (microSiemens/centimeter)
1 µS/cm
10 - 10,000 µS/cm ± 1% of reading
0 - 10 µS/cm ± 20% of reading
32 – 158°F (0 – 70°C)
0.1°C
± 1% of reading
Polycarbonate
NEMA 4X
8.5" x 6.5" x 5.5"
2 x 16 character backlit liquid crystal
32 – 122°F (0 – 50°C)
-20 – 180°F (-29 – 80°C)
150 psi
150 psi
¾" NPTF
2

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