Specifications

1
1. Introduction
The 870ITPH Intelligent Transmitter converts pH, ORP, or Ion Selective Electrode
measurements to a 4 to 20 mA and/or digital output signal depending on the model selected and
the configuration implemented.
The analog only output version (Model 870ITPH-A) supports configuration, calibration, and
diagnostic troubleshooting locally at the front panel. The transmitter has one 4 to 20 mA dc
output which can be software configured (connected) to temperature compensated measurement,
uncompensated (absolute) measurement, or temperature.
The digital output version (Model 870ITPH-F) supports configuration, calibration, and
diagnostic troubleshooting locally at the front panel, via a PC-based configurator anywhere on the
signal leads, or from any I/A Series workstation via an Intelligent Transmitter Fieldbus Module.
The digital output version supports either digital only communication or a hybrid 4 to
20 mA dc/digital communication as configured. When operating in either of these modes, the
transmitter continuously outputs three digital measurement values: temperature compensated
measurement, uncompensated (absolute) measurement, and temperature. In the 4 to 20 mA
mode, you may assign the output to any one of the three measurement parameters.
Quick Start
The purpose of this section is to:
♦ Help you to wire your transmitter
♦ Familiarize you with the instrument configuration as received from the factory
♦ Assist you in verifying that your transmitter is in calibration
♦ Explain normal operation in Measure mode.
Wiring
Your 870IT is a 2-wire transmitter. As such, it transmits output over the same two wires through
which it receives power. If your transmitter was specified with analog communications
(870ITPH-A), you must supply its power source. If it was specified with digital communications
(870ITPH-F), power can be provided via the I/A Series Fieldbus Module. Connect this
power/output signal to the power terminals and the signals from your measurement sensor to the
appropriate terminals near the top of the case as shown in Figure 1.
WARNING
!
Wiring installation must comply with any existing local regulations.
WARNING
!
A safety agency certified energy barrier must be used with this apparatus to meet
agency certification requirements. See MI 611-206 (FM/CSA) or MI 611-208
(ATEX) for details.