MΩ range (more than 1000 kΩ). If liquid is detected, it will
drop to less than 100 kΩ, sometimes to less than 5 kΩ or
signicantly different from each other, the TTDM will signal a
communications between the TTDM-128 and the SIM channel
or damaged RS-485 cable.
length of sensing cable into as many as 10 smaller sections.
H56874 4/03 www.tycothermal.com +1 (650) 474-7400 25
TTDM-128
User Manual
Modifying Settings for Individual SIM Channels
To change the alphanumeric tag for the selected SIM channel:
► Select the appropriate SIM channel as described previously in this section.
► Use the DOWN arrow key to select ID, then press ENTER.
► Use the L
EFT and RIGHT arrows to select a character position to modify.
Tip: Use the RESET key to “tab” between Letters, Numbers, and blank.
► Use the U
P and DOWN arrows to cycle through all available characters until the desired
character is displayed. There are numerous punctuation, currency, Katakana, and non-
English alphabetical characters available. Going “up” or “down” cycles through all available
characters.
► Press ENTER once the label has been set up as desired.
To change the length units for the selected SIM channel:
► Select the appropriate SIM channel as described previously in this section.
► Use the D
OWN arrow key to select Test Length, then press ENTER.
► Use the DOWN arrow key to select the desired units, then press ENTER.
CHOOSING APPROPRIATE LEAK ALARM AND SERVICE REQUIRED LEVELS.
Leak sensitivity and Service Required levels should be based on the type of liquid being
detected and the environment in which the sensing cable is installed.
▪ Normal (default) for most applications.
▪ High for de-ionized water and high purity acids/aqueous solution.
▪ Low for particular active or exposed applications.
▪ TT500x for systems using hydrocarbon-sensing cable (TT5000, TT5001) to monitor
doublewall pipes and tanks.
▪ Never (only available for Service Required setting) to disable the Service Alarm.
Note: Password is required to change leak and service sensitivity settings.
To change the leak alarm sensitivity:
► Select the appropriate SIM channel as described previously in this section.
► Use the DOWN arrow key to select Leak Alarm <=, then press ENTER.
► Use the D
OWN arrow key to choose a sensitivity level (High, Normal, Low or TT500X).
► Press ENTER.
To change the Service Required setting:
► Select the appropriate SIM channel as described previously in this section.
► Use the DOWN arrow key to select Serv Alert >=, then press ENTER.
► Use the DOWN arrow key to choose a Service Required level (High, Normal, Low, TT500X, or
Never).
► Press ENTER.
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