DSS EX Explosion-Proof Transmitter and Controller Instruction Manual
78
SafeTouch
®
Buttons
The DSS EX is equipped with four sensors that operate as through-glass buttons so that it can be
programmed and operated without removing the cover (and exposing the electronics) in a hazardous
area.
These buttons can be disabled for security by selecting DISABLE on the switch labeled NO-CONTACT
BUTTONS located on the connector board.
To actuate a button, press one finger to the glass directly over the marked button area. Then retract finger
more than three inches from the glass before pressing the next button. When the cover is removed, the
four mechanical buttons located next to the sensors are used. The sensors are disabled when a
mechanical button is pressed and will automatically be re-enabled after 60 seconds of inactivity.
The SafeTouch Buttons are designed to filter normal levels of ambient interference and to protect against
false triggering, however, it is recommended that the SafeTouch Buttons be disabled (slide switch to
LOCK) if there is an infrared interference source in line-of-sight to the display.
The SafeTouch Buttons are configured by default to duplicate the function of the front panel mechanical
pushbuttons associated with the integrated meter. The symbols by each SafeTouch button correspond to
a mechanical button as shown in the above table.
SafeTouch Button Tips:
•
To the extent possible, install the
display facing away from sunlight,
windows, reflective objects and any
sources of infrared interference.
•
Keep the glass window clean.
•
Tighten the cover securely.
•
Use a password to prevent tampering.
Function Keys Operation
During operation, the programmable function keys operate according to the way they have been
programmed in the
Advanced Features – User
menu.
The table above shows the factory default settings for F1, F2, and F3.
F4 Operation
A digital input, F4, is standard on the scanner. This digital input is programmed identically to function keys
F1, F2, and F3. The input is triggered with a contact closure to COM, or with an active low signal. During
operation, F4 operates according to the way is has been programmed in the
Advanced Features – User
menu. See page 71 for details.
Maximum/Minimum Readings
The max & min readings (peak & valley) reached by the PVs or math channels can be displayed by
assigning the display to max/min through the
Display Setup
menu.
A digital input should be programmed to reset the max & min readings.
WARNING
Take caution when cleaning the window
glass as it may result in unintentional
SafeTouch button events. Only clean the
DSS EX when the system is safely shut
down, and inspect the DSS EX for proper
configuration prior to system restart.
