(USA and Canada only)
The SNAP-pH/ORP module provides two isolated channels of high-impedence voltage input, either -1.00 to +1.00 volts or -0.50 to +0.50 volts. The module is ideal for differential voltage measurements and is used with pH or oxidation reduction potential (ORP) probes for monitoring bodies of water.
The SNAP-pH/ORP module can be used with SNAP PAC brains and R-series controllers, legacy SNAP Ethernet-based brains, and legacy serial B3000 and B3000-B brains.
-1.00 V to +1.00 V for ORP probes
-0.50 V to +0.50 V for pH probes
40 µV when configured -1.00 V to +1.00 V
20 µV when configured -0.50 V to +0.50 V
Data Freshness (Maximum)
126 ms (63 ms per channel) when configured -1.00 V to +1.00 V
251 ms (125.5 ms per channel) when configured -0.50 V to +0.50 V
-3 dB @ 2.4 Hz
DC Common Mode Rejection
AC Common Mode Rejection
>-120 dB at 60 Hz
Maximum Survivable Input
±100 VDC or peak AC
Maximum Operating Common
250 VDC or peak AC
Accuracy (% full scale)
0.05% when configured -1.00 V to +1.00 V
0.05% when configured -0.50 V to +0.50 V
Gain Temperature Coefficient
Offset Temperature Coefficient
5 VDC (±0.15) at 170 mA
Input Resistance (Differential)
>10 Tera Ohms (each channel)
-20 to 70 °C
-40 to 85 °C
Torque, hold-down screws
Not to exceed 1 in-lb (0.11 N-m)
Torque, connector screws
5.22 in-lb (0.59 N-m)
CE, RoHS, DFARS
This document lists and describes all current Opto 22 SNAP PAC System part numbers, including PAC Project software, SNAP PAC controllers, and SNAP I/O modules of all kinds. SNAP PAC mounting racks and SNAP power supplies are also listed.
The SNAP-pH/ORP module provides two isolated channels of high-impedance voltage input, either -1.00 to +1.00 volts or -0.50 to +0.50 volts. The module is ideal for differential voltage measurements and is used with pH or oxidation reduction potential (ORP) probes for monitoring bodies of water such as holding tanks, swimming pools, and cooling towers.
The U.S. Bureau of Reclamation constructs dams, power plants, and canals, and delivers water to more than 31 million Americans. The Bureau also operates the Leadville Mine Drainage Tunnel (LMDT), which drains off and treats water from the local mining district so it can be safely discharged into the Arkansas River.
At the LMDT, the Opto 22 SNAP PAC System is used to monitor water levels, remove metals, adjust the water’s pH, reduce water turbidity, and otherwise treat the water before releasing it—cleaner even than everyday drinking water. More than 2500 I/O points are monitored, controlled, and alarmed.
This document is a statement of compliance with the EU Directive 2015/863/EU, Restriction of Hazardous Substances (RoHS 3). This document lists Opto 22 products that comply with the substance restrictions of the RoHS 3 directive.
This document is the Manufacturer's Declaration for the listed products as mentioned in the attachment - to which this confirmation refers - that they are in accordance with the mentioned European, international and/or national standards and regulations.
This overview describes the four integrated components of the SNAP PAC system: software, controllers, brains and I/O. This hardware and software system is designed for industrial control, remote monitoring and data acquisition.
A quick overview on securing a SNAP Module to a SNAP rack.
A quick overview on removing a SNAP module.
What's the difference between accuracy and resolution in analog I/O specifications? Try your own specs in the calculator.