![Rosemount SOLU COMP II Instruction Manual Download Page 48](http://html1.mh-extra.com/html/rosemount/solu-comp-ii/solu-comp-ii_instruction-manual_1487426048.webp)
41
MODEL SOLU COMP II
SECTION 8.0
TROUBLESHOOTING
SECTION 8.0
TROUBLESHOOTING
8.1 OVERVIEW
8.2 TROUBLESHOOTING USING FAULT CODES
8.3 TROUBLESHOOTING WHEN NO ERROR MESSAGE IS SHOWING
8.4 SIMULATING INPUTS
8.5 SIMULATING TEMPERATURE
8.6 MEASURING REFERENCE VOLTAGE
8.1 OVERVIEW
The Solu Comp II continuously monitors itself and the sensor for faults. When the analyzer detects a fault, the
word
fault appears in the display alternately with the measurement. If alarm 3 was configured as a fault alarm,
the alarm relay will energize. The outputs do not change during a fault condition. They continue to reflect the
measured pH, ORP, or temperature. Press
"
"
to display the fault codes.
8.2 TROUBLESHOOTING USING FAULT CODES
8.2.1 Absolute Value of Measured Voltage Exceeds 2500 mV
The voltage of a pH cell is usually between 600 mV and -600 mV, and the voltage of an ORP cell is between 2000
and -2000 mV. Readings outside the range -2500 mV to 2500 mV usually indicate a problem with sensor wiring or
analyzer electronics.
A. If the sensor is being installed for the first time, check the wiring connections. See Section 3.3. If a junction box
is being used, be sure to check all connections at the junction box, too.
B. If the preamplifier is in a junction box, verify that the wires supplying the power (±5 Vdc) to the preamplifier are
connected at the analyzer and junction box.
C. Verify that the sensor is completely submerged in the process liquid.
8.2.2 pH Sensitive Glass Membrane is Broken
The Solu Comp II continuously measures the impedance between the sensor solution ground and the inside of the
pH-sensing electrode. If the glass membrane is intact, the impedance is normally between 10 M
Ω
and 1000 M
Ω
.
If the membrane is cracked or broken, the impedance drops below 10 M
Ω
. If the membrane is cracked or broken,
the sensor must be replaced.
8.2.3 RTD for Sensor 1 or Sensor 2 Open or Shorted.
There is an open or short in the sensor RTD or wiring.
A. If sensor is being installed for the first time, check the wiring connections. See Section 3.0.
B. Disconnect the sensor from the analyzer and measure the resistance between the RTD lead wires. See the
sensor manual to identify the RTD leads. If there is an open or short circuit, replace the sensor.
C. If there is no open or short, check the analyzer. See Section 8.4.
Fault Code
Explanation
See Section
S1 or S2 Out of Range
Absolute value of measured voltage exceeds 2500 mV
8.2.1
S1 or S2 Broken Glass
pH sensitive glass membrane is broken
8.2.2
TC1 Open or TC2 Open
RTD for sensor 1 or sensor 2 is open
8.2.3
TC1 Shorted or TC2 Shorted
RTD for sensor 1 or sensor 2 is shorted
8.2.3
S1 or S2 Sense Line Open
RTD sense line for sensor 1 or sensor 2 is open
8.2.4
EEPROM Failure
EEPROM failure
8.2.5