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SD7420CD & SD7420CD-ORP
PRODUCT SPECIFICATION SHEET
DIFFERENTIAL pH AND ORP PROBES WITH DIRECT 4-20mA OUTPUT
Employs differential measurement technique
Complete encapsulation protects internal electronics
Buffered reference cell solution resists contamination
Superior accuracy through elimination of ground loops
No transmitter required: direct 4-20mA output signal
Two year limited warranty
Differential sensors have longer working lifetimes
The differential design employs two glass electrodes, which
record pH or ORP measurements differentially with respect
to a third metal electrode. The reference cell of a differential
sensor is actually a measuring electrode in a concentrated pH
7.0 buffer solution rather than a traditional silver/silver chloride
reference. This type of reference cell resists contamination by
the sample, improving measurement accuracy and extending
sensor lifetime.
RECOMMENDED APPLICATIONS:
• Wastewater Treatment
• Drinking Water Treatment
• Odor Scrubbers
• Food Processing
• Metal Finishing
• Pulp and Paper
• Chemical Processing
Save time and money with quick and easy maintenance
With differential technology, you won’t have to replace the
entire sensor after just a few months. Simply replace the salt
bridge and refill the reference solution to keep your electrode
working longer.
Don’t want to purchase a transmitter or controller?
You don’t have to. With a direct 4-20mA output, these differential
sensors can be hooked up to a PLC or SCADA system with no
transmitter or controller required.
Reliable performance in variable operating conditions
The differential design provides unsurpassed accuracy by
virtually eliminating ground loops. Automatic temperature
compensation ensures measurement accuracy in environments
with rapid temperature changes. Durable Ryton® PPS body
construction for extensive chemical compatibility.
DIRECT FIT COMPATIBILITY:
• Hach
• Hach
• Water Analytics
®
6428PO or 2428R0 (LCP body)
®
6422PO or 2422R0 (Ryton body)
®
P65C-8 or R65C-8 (CPVC Body)
Hach is a registered trademark of Danaher. No endorsement or affiliation is stated or implied.
DESIGNED AND ASSEMBLED IN CALIFORNIA, USA
11751 MARKON DRIVE • GARDEN GROVE, CA 92841 • 714.895.4344 • WWW.SENSOREX.COM
© Sensorex Corporation. All rights reserved. In the interest of improving and updating its equipment, Sensorex reserves the right to alter specifications to equipment at any time.
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SPECIFICATIONS
pH Measurement Range:
ORP Measurement Range:
pH Stability:
Wetted Materials:
Transmission Distance:
Temperature Compensation:
Temperature Range:
Pressure Maximum:
Flow Rate:
Sensor Cable:
Power Requirement:
SD7420CD & SD7420CD-ORP
0 to 14 (4-20mA)
-2000mV to 2000mV (4-20mA)
0.03 pH per 24 hours, non-cumulative
PPS body and salt bridge, PVDF & ceramic
junction, Viton o-rings, titanium solution ground,
pH glass or ORP - platinum band
3000ft (914m)
10K NTC (no separate temperature output)
0-85°C (32-185°F)
100psig @ 40°C (104°F)- for PVC tee/ fitting
100psig @ 60°C (140°F)- for CPVC tee/fitting
100psig @ 85°C (185°F)- for stainless steel tee/
fitting
10ft/sec maximum (3 meters/sec)
5 conductor plus shield, 22AWG, 20ft (6.1m), use
only red and black wires
12 - 30V DC ( > 24V DC recommended)
PRODUCT SPECIFICATION SHEET
Cable 20ft,
1-1/2” NPT
1-1/2” NPT
Protective
pH Glass or
platinum(ORP)
1.85”
(47mm)
pin
Solution
Ground
1.44”
(37mm)
5 conductor
plus shield
1.47”
(37mm)
2.13”
(54mm)
6.32”
(160mm)
Salt Bridge
14mm(9/16”) hex
1.92”
(49mm)
ORDERING INFORMATION
Part Number Description
SD7420CD
SD7420CD-ORP
SDA-7001
SDA-7003
SDA-7010
SDS-7015
© Sensorex Corporation. All rights reserved. In the interest of improving and updating its equipment, Sensorex reserves the right to alter specifications to equipment at any time.
Differential pH sensor with direct 4-20mA output, 20ft cable, tinned leads, 1.5” NPT mounting
Differential ORP sensor with direct 4-20mA output, 20ft cable, tinned leads, 1.5” NPT mounting
Replacement salt bridge for SD7420CD & SD7420CD-ORP, 1 each
Replacement salt bridge for SD7420CD & SD7420CD-ORP, 3 each
Replacement salt bridge for SD7420CD & SD7420CD-ORP, 10 each
Standard cell refill solution, 125mL
DESIGNED AND ASSEMBLED IN CALIFORNIA, USA
11751 MARKON DRIVE • GARDEN GROVE, CA 92841 • 714.895.4344 • WWW.SENSOREX.COM
Document #450007 Revision A: Published 7/27/16
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