PH/PHX-2 Manual
50
WARNING! Before performing any maintenance, make
sure the Main Power Switch is OFF and incoming power is
locked OFF. NEVER access the inside of the Control Panel
with the Proportioner power supply ON. The Heaters are
components that reach high temperatures; you must wait
until they have cooled before handling and bleed all
material pressure to zero.
To replace a defect Heating Rod, proceed as follows:
1. Ensure Main Power Switch is OFF and incoming power is
locked OFF. Depressurize proportioner and remove the Cover
on Heater.
WARNING! If the Heating Rod to be replaced is the one in contact with
the Thermocouple, it is necessary to remove the Thermocouple first (see
page 49). Do not loosen or tighten Thermocouple Body.
2. Disconnect the suspect Heating Rod from the wire connections and test the
Heating Rod again for proper electrical resistance.
INDIVIDUAL OHMS
MEASUREMENT
TOTAL OHMS MEASURMENT
PER FLUID SIDE
3. Unscrew the Heating Rod and remove from the Heater Block along with its Spring
and inspect; it must be smooth and shiny in appearance. If it is blackened or has
material adhered to it replace the Heating Rod, even if ohm reading is acceptable.
4. Apply Teflon Tape or appropriate Thread Sealant to the Heating Rod thread and
assemble Heating Rod and Spring into the Heater Block. Tighten securely to 110
ft/lbs (150 Nm)
5. If necessary carefully re-install Thermocouple ensuring positive physical contact
with the Heating Rod. Make sure the Spring does not prevent the Thermocouple
from making contact with the Heating Rod. Tighten Nut with open-end wrench.
6. Reconnect wire connections and replace Cover.
7. Ensure Heater is full of material prior to electrical testing.
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