2
2.0 SPECIFICATIONS
2.1 Measurement
Performance
pH Range
-2 to 16 pH units
pH Resolution
0.0015 pH units (0.01 pH displayed)
pH Accuracy (Calibrated):
± .01 pH
ORP Range
-1500 to 1500 mV
ORP Resolution
92 µV (1mV displayed)
ORP Accuracy
±1 mV
Temp Comp (optional):
100 or 1000 ohm platinum RTD
Temperature Range
32-212°F (0-100°C)
Temperature Resolution
±0.09°F (0.05°C)
Temperature Accuracy
± 0.9°F (± 0.5°C)
2.2 Electrical:
Input/Output
Input Power
100-240 VAC, 50/60 Hz, 8A
Fuse: 1.0 ampere, 5 x 20 mm
Input Signals
pH/ORP ±1500
mV
Temp Comp (optional)
Pt100 or Pt1000
Interlock (optional)
Isolated, dry contact closure required (i.e., flow, level, etc.)
Outputs
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
CTRL 3
CTRL 4
ALARM
WPH410 Powered Powered Dry
Dry
Dry
WPH420 Pulse
Pulse
Dry
Dry
Dry
WDP410 Powered Powered Powered Powered Powered
WDP420 Pulse
Pulse
Dry
Dry
Dry
WDP440
Pulse Pulse Pulse Pulse Dry
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)
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
Agency Approvals
UL
ANSI/UL 61010-1:2004, 2
nd
Edition*
CAN/CSA
C22,2 No.61010-1:2004 2
nd
Edition*
CE Safety
EN 61010-1 2
nd
Edition (2001)*
CE EMC
EN 61326 :1998 Annex A*
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.
