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Typical conductivity card connections
Figure 41 Two Wire Boiler Probe on XE1
The 2-Wire boiler conductivity probe connects to XE1 or XE4, pins 1 and 2. This sensor is not polarity sensitive.
Figure 43 Four Wire Condensate Probe
On XE2
The 4-Wire condensate conductivity probe connects to XE1 and XE2 or XE3 and XE4 as shown. Wires on XE1 and XE4 are
not polarity sensitive. The temperature input on XE2 and XE3 must be connected as shown. The green is – and the white is +.
6.3.12 Dual pH-ORP-Temp Driver
Two inputs; can both be pH or both be ORP, or one of each.
Any 2-wire pH sensor will work if the mV/pH is ~59.1
Any 2-wire ORP will work if mV is in the range of +/- 1,000mV
The pH, ORP or temperature (Pt100 or Pt1000 only) sensors can be extended a maximum of 10
meters/30 feet from the controller. For longer distances, use a 4-20mA sensor transducer and a 4-
20mA input card.
The temperature input sensor can be an LM335¹ (10mV/°K) sensor or either a 100
Temperature can be used for display, control or compensation.
If an electrical potential exists in the water, it should be removed. If it cannot be removed, a potential
equalization electrode (also called "liquid potential" or "solution ground") connection can be used.
If a potential equalization electrode is used, the default wire jumper(s) on XE3 and XE7 must be
removed before connecting the potential equalization electrode to input XE3:2 and/or XE7:2. If not
using a potential equalization electrode, leave the default jumpers in place on XE3 and XE7.
FOOTNOTE 1: LM335 is our SGT sensor, pn 1051507
Figure 42 Two Wire Boiler Probe
Figure 44 Four Wire Condensate Conductivity Probe
Page 39 of 102
Mounting and Installation
or 1000
RTD.
Figure 45 Dual pH/
ORP Driver
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