Specifications; Measurement Performance; Electrical: Input/Output - Walchem WDP420 Instruction Manual

2.0

SPECIFICATIONS

2.1

Measurement Performance

pH Accuracy (Calibrated):
Temp Comp (optional):
Temperature Resolution
Temperature Accuracy
2.2

Electrical: Input/Output

Input Power
Input Signals
Outputs
WPH410
WPH420
WDP410
WDP420
WDP440
Note: The Alarm relay is non-programmable. Refer to the Main Menu diagram for the list of error
conditions that trigger the alarm relay.
4 - 20 mA 1 or 2 (optional)
Agency Approvals
Note: For EN61000-4-6,-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.
pH Range -2 to 16 pH units
pH Resolution 0.0015 pH units (0.01 pH displayed)
± .01 pH
ORP Range -1500 to 1500 mV
ORP Resolution 92 µV (1mV displayed)
ORP Accuracy ±1 mV
100 or 1000 ohm platinum RTD
Temperature Range 32-212°F (0-100°C)
±0.09°F (0.05°C)
± 0.9°F (± 0.5°C)
100-240 VAC, 50/60 Hz, 8A
Fuse: 1.0 ampere, 5 x 20 mm
pH/ORP ±1500 mV
Temp Comp (optional) Pt100 or Pt1000
Interlock (optional) Isolated, dry contact closure required (i.e., flow, level, etc.)
Powered Relays Internally powered relays 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
Pulse Outputs Opto-isolated, Solid State Relay
150mA, 40 VDC Max.
VLOWMAX = .13V @ 18 mA
Dry contact relays 6 A (resistive), 1/8 HP
Dry contact relays are not fuse protected
CTRL 1 CTRL2
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Internally powered
Fully isolated
600 Ohm max resistive load
Resolution .001% of span
Accuracy ± 1% of reading
pH/ORP Preamp Power ±5 VDC, 5 mA
UL ANSI/UL 61010-1:2004, 2
CAN/CSA C22,2 No.61010-1:2004 2
CE Safety EN 61010-1 2
CE EMC EN 61326 :1998 Annex A*
CTRL 3 CTRL 4
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Edition*
nd
Edition*
nd
Edition (2001)*
2
ALARM
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