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PART ONE - INTRODUCTION
SECTION 1 - GENERAL INFORMATION
Model P63 pH Analyzer
Rev. 7-1201
14
Relays
TTL Outputs
Transfer Condition
(for analog outputs,
relays, and TTL outputs)
Optional
PID Controller
1.2 Modular Construction
a dedicated non-variable alarm signal of only 4 mA or 20
mA instead of its normal proportional output. When the
analyzer detects that one of the 4-20 mA loops is open, it
displays a “Current Load High” diagnostic message.
The analyzer has three relays. They may be the standard
electromechanical relays, or the optional solid state AC or
solid state DC relays.
The analyzer has three TTL (NAMUR) outputs. They can be
used to represent the established German NAMUR Com-
mittee standards for measurement and control:
•
TTL Output A:
Instrument is “off line” for calibration or
maintenance.
•
TTL Output B:
One or more software or system alarms
are in the “warn” state.
•
TTL Output C:
One or more software or system alarms
are in the “fail” state.
Each enabled TTL output can be set to operate as “fail
safe,” and assigned an “on delay” time.
The states of the analog outputs, relays, and TTL outputs
can be separately transferred to user-preset states. This is
especially useful during calibration or when performing
maintenance. See PART THREE, Section 5.9 for details.
The optional PID controller has a selectable algorithm (ISA
or velocity), all tuning functions including manual reset, and
timers for 0% and 100% controller output. In addition to its
normal automatic operation, the controller can be operated
manually using screens in the MAINT menu.
The modular construction of the analyzer simplifies field
servicing and provides electrical safety. The front
door/keypad assembly uses voltages no greater than 24
VDC, and is completely safe to handle.
Opening the analyzer door accesses terminals inside the
enclosure for electrical connections. Line power must be
connected to specifically designated terminals on TB5/TB6.
WARNING:
REMOVE LINE POWER BEFORE NEARING THIS
AREA TO AVOID ELECTRICAL SHOCK.
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