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5700E ORP manual www.omega.com
e-mail: info@omega.com
Users Guide
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PHCN-5700
pH/ORP Indicator ORP Instructions
ENTER
RELAY 1
RELAY 2
ORP
-1000
-750
+750
-500
+500
-250
+250
0
+1000
® It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.
OMEGAnet
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e-mail: sales@omega.co.uk CAUTION!
Refer to instruction manual for more details.
Remove power to unit before wiring input and output connections.
Follow instructions carefully to avoid personal injury.
ENGLISH
OMEGA PHCN-5700 pH/ORP Indicator - ORP Instructions
1. Power Connections
2. Compatible Electrode/Preamp Wiring
Technical Notes:
To reduce the possibility of noise interference, isolate AC power
lines from signal lines.
Maximum 4-20 mA loop impedance (sec. 3) is affected by the
supply voltage.
Technical Notes:
Use six conductor shielded cable for cable extensions up to 120 m
(400 ft) max.
Cable shield must be maintained through cable splice
= Double Insulated
= DC or AC power
Contents
1. Power Connections
2. Compatible Electrode/Preamp Wiring
3. 4 - 20 mA Current Output Connections
4. Relay Connections
5. Relay Operation
-
+
12-24 V
10 W
-
+
12 - 24 VDC
OR
12 - 24 VAC
PHCN-5700
Terminals
External power
supply
V +
Red Wire
V -
Black wire
T -
White wire
T +
Green wire
mV Input
Brown wire
Iso. Gnd
Blue wire
-
+
pH/ORP
Blue
Black
Red
Brown
White
Green
ORP Electrodes:
OMEGA ORE-2715
OMEGA ORE-2717
Preamp:
OMEGA PH-2720-PA
4-20
mA
Silver (earth ground)
PHCN-5700
Terminals
CAUTION!
Never connect 110 VAC or 220 VAC to rear power
terminals. High voltage AC will damage instrument and
void warranty.
-
+
pH/ORP
4-20
mA
-
+
Fuse**
1/8A
4 - 20 mA
*
PHCN-5700
Terminals
3. 4 - 20 mA Current Output Connections
To isolate output and prevent ground loop problems:
1. Use monitor device with isolated inputs, or
2. Use separate DC supply for PHCN-5700 and monitor device, or
3. Power PHCN-5700 with12 - 24 VAC step down transformer
Technical Notes:
**1/8A fuse recommended (customer supplied)
* 4-20 mA output is internally powered (non-isolated), maximum loop
impedance 350 with a 12 V instrument supply voltage, 950 with a 24 V instrument supply voltage.
6. Menu Functions
7.
Parts and Accessories
8.
Specifications
9.
Quick Reference Menu Parameters
10. Troubleshooting
11. Maintenance
Remove terminal blocks for easy wiring
Total
reset
AUX
output
PLS
output
1
2
Gnd
+
+
-
+
Gnd
Freq. IN
Sen. Pwr.
Freq. IN
Iso. Gnd
Std. Sensor

Patent No. D376,328
Flow
Open Collector
Sensor
12-24 V
10 W
LISTED
77CJ
UL
1 2 3 4 5 6 1 2 3 4
1 2
1 2
Total
reset
AUX
output
PLS
output
1
2
Gnd
+
+
-
+
Gnd
Freq. IN
Sen. Pwr.
Freq. IN
Iso. Gnd
Std. Sensor

Patent No. D376,328
Flow
Open Collector
Sensor
12-24 V
10 W
LISTED
77CJ
UL
1 2 3 4 5 6 1 2 3 4
1 2
1.
2.
3. A. LOW alarm mode
The relay is energized when the ORP drops below the setpoint, and is
de-energized when the ORP rises above the setpoint plus hysteresis
(sec. 6.3D, 6.3E).
B. HIGH alarm mode
The relay is energized when the ORP rises above the setpoint and is
de-engergized when the ORP falls below the setpoint plus
hysteresis (sec. 6.3D, 6.3E).
ORP
ORP
Low setpoint=
Adjustable hysteresis=
Relay energized=
Relay de-energized=
High setpoint=
Adjustable hysteresis=
Relay energized=
Relay de-energized=
C. Proportional PULSE mode
The proportional pulse relay configuration is primarily designed for metering pump control. The operator is prompted to enter a minimum and
maximum ORP setpoint and maximum pulse rate for the assigned relay (sec. 6.3F, 6.3G). Relay pulse width is fixed at 130 ms. Refer to the
operation examples below.
Metering pump chemical addition (dry contact activation type required)
Example 1 (right):
As the process ORP rises above the minimum pulse setpoint (-500 mV) the relay
begins pulsing; triggering the metering pump for chemical addition. As the ORP
continues to rise, pulsing accelerates proportionally until the maximum programmed
pulse rate of 300 pulses/minute and setpoint (+500 mV) are reached, forcing the
process ORP back down to intended levels (e.g. -500 mV).
Example 2 (right):
As the process ORP falls below the minimum pulse setpoint (+500 mV) the relay
begins pulsing; triggering the metering pump for chemical addition. As the ORP
continues to decrease, pulsing accelerates proportionally until the maximum
programmed pulse rate of 300 pulses/minute and setpoint (-500 mV) are
reached, forcing the process ORP back up to intended levels (e.g. +500 mV).
-1000
mV
+1000
mV
Relay 1 or
Relay 2
-500 mV
+500 mV
0 pulses
ORP
300 pulses
-1000
mV
+1000
mV
Relay 1 or
Relay 2
+500 mV
-500 mV
ORP
300 pulses
0 pulses
30
30
5. Relay Operation
4. Relay Connections
Two internal relay contact sets (COM, NO, and NC) may be used for
external device control. Front panel LED annunciators indicate the
activation status of each relay. Each relay can control up to two
devices simultaneously, as shown. Relay operation modes include Low
alarm, High alarm, and Proportional Pulse (sec. 5).
Common device connections include:
Pulse mode - metering pump control
Pulse mode - solenoid valve control
Low or High mode - warning lamps
Low or High mode - bells or sirens
Low or High mode - external heavy-duty relay
Wiring Example Right
Device A IS powered when relay 2 is de-energized (front panel LED
off). Power is discontinued when the relay 2 setpoint is reached
(front panel LED on). Device B IS NOT powered when the relay 2 is
de-energized. Power is applied after the relay 2 setpoint is reached.
+
-
-
Device
A
External AC/DC
power
+
-
+
Device
B
Relay 1
Relay 2
NC
C
NO
NC
C
NO
PHCN-5700
Terminals
NC
C
NO
NC
C
NO
Relay
De-energized
Relay
Energized
Technical Notes:
Maximum relay contact ratings: 5 A @ 30 VDC, 5 A @ 125 VAC,
or 3 A @ 250 VAC
An external heavy-duty relay must be used for devices with surge
currents or operating currents that exceed the above specifications. 6. Menu Functions
To access either CALIBRATE or OPTIONS menus, press and hold the
ENTER key as illustrated below:
Menus:
VIEW menu (sec. 6.1): The VIEW menu is displayed during
standard operation. The operator can navigate freely through the
menu by pressing either UP or DOWN arrow keys.
CALIBRATE Menu (sec. 6.3): The CALIBRATE menu contains all
critical display setup and output parameters. A simple security code
feature prevents unauthorized tampering. The operator is required
to enter a simple access code for menu access. The same code
also unlocks OPTIONS menus.
OPTIONS Menu (sec. 6.4):