User Manual

LINEARITY
 Electronics:±0.05%(±0.01pHunits/±1mVoffullscale)
RESOLUTION
 DigitalDisplay:±0.01pHunits/±1mV
 AnalogMeter:±0.13pHunits/±40mV
SENSITIVITY
 0.05%offullscale(0.01pHunits/1mV)
STABILITY
 ±0.05%offullscale(±0.01pHunits/±1mV)
REPEATABILITY
 ±0.05%offullscale(±0.01pHunits/±1mV)
CALIBRATION CHECK
 Builtin(7&0pH/0&-2000mV)
RECORDER OUTPUT
 Isolated0-10VDC@5mAmax.(linear);standardonall
models
OUTPUT IMPEDANCE
 100Ω±5%
SENSOR INPUT
1 (optional 3 sensor Input available)
NOTE: pH and ORP may NOT be mixed.
CONTROL FUNCTIONS
Models 722II, 723II & 727II, 728II:
Single set point alarm/control continuously adjustable
0-100% of span
Second set point alarm/control (Optional).
Continuously adjustable - 0-100% of span
Hysteresis
Adjustable from 0.3-3 % of full scale
Indicators
“HIGH” (red) and “LOW” (green) set point LEDs - reversible.
Relay Contact Rating
 SPDT10amp@250VAC,30VDC.Relayoperates
increasing or decreasing reading (user selectable).
Solid State Output
 24VDCunregulated,30mAMaximum.
Powers optional PA - Piezo Electric Alarm, RA™ - Remote
Alarm, or customer alarm within above limits.
SecondAlarm/controlModule,withabovespecications,opt.on
Models 722II, 723II & 727II, 728II:
POWER SPECIFICATIONS
115/230 VAC ±15%, 50/60 Hz (User selectable)
overvoltage category II
100 mA Maximum Current
Double Insulated (with circuit board ground for OEM operation)
 Fuse-100mASlowBlow(T.10A)forboth115&230VAC(V~)
User replaceable
Humidity - 20-90% non-condensing
Max. Altitude -
40,000 ft/12,000 meters non-operating
10,000 ft/3000 meters operating
Pollution degree 2
24 VAC or 24 VDC Option available on Special Order
 OvervoltagecategoryII(24VAC)
250 mA Maximum Current
Double Insulated (with circuit board ground for OEM operation)
Fuse - 250mA Slow Blow (T.25A) User replaceable
AMBIENT TEMPERATURE RANGE
32°F to 140°F ( 0°C to 60°C)
DIMENSIONS
6.0” (152mm) H x 4.8” (122mm) W x 3.8” (96mm) D
HOUSING CONSTRUCTION
Fully gasketed heavy-duty ABS for splashproof and corrosion
resistance.
Rated IP65/NEMA 4X
Double Insulated
WEIGHT
720 Series II: average 2 Ibs. (0.9 kg)
C. OPTIONAL FEATURES
-SC Second Alarm/control Module (M/c models only)
-4A 4-20 mA Isolated output (Digital & OEM only)
-PA 70 db Piezo Electric Alarm (digital M/c models only)
-PAT Piezo Alarm & Timer Module (digital M/c models only)
-35BL 3 1/2 digit backlit LCD
-TP Temperature Module Requires -TP sensor
(Digital Models Only)
-TH Alarm/control Interface Harness (requires SC & TP)
 -PC 115VACPowercord(8ft.withUSAplugandstrain
relief) - NOTforusewith230VAC.
 -24VA 24VACisolatedpowersupply(specialorder)
 -24VD 24VDCisolatedpowersupply(specialorder)
 -PTST PanelmountedZERO(7pHor0mV)Testswitch
(special order)
D. ACCESSORIES (ordered separately)
SCO Second Alarm/control Module (M/c models only)
4AO 4-20 mA Isolated output (Digital & OEM only)
3SO 3 Sensor Input Switch Module with
3 foot/1 meter cable*.
3SE 3 Sensor Input Switch with enclosure.
PAO 70 db Piezo Electric Alarm only (723II/728II)
PATO Piezo Alarm & Timer Module (723II/728II)
35BLO 3 1/2 digit backlit LCD w/Bezel
TPO Temperature Module Requires additional ITS1
sensor (Digital Models Only)
THO Alarm/control Interface Harness
(requires SCO & TPO)
 PCO 115VACPowercord(8ft.withUSAplugandstrain
    relief)-NOTforusewith230VAC.
SMP50 Surface Mounting Plate
RA Remote Alarm - RA™ (controller models only)
 VR  Powersupply,24VAC,20VA(115VAC,indooruse)
 024-1 24VAC1”SolenoidValve
720SS pH/ORP Sensor Substitute (NIST Traceable)
 pHC NISTCerticatewithoutSensor
 pHCS NISTCerticatewithSensorinBufferSolutions
 OC  NISTCerticatewithoutSensor
*Customer mounted separately
6
DOUBLE INSULATED