Section 4 - Calibration; Introduction; Calibration Procedures; Equipment Required For Calibration - ABB Platinum standard Series Product Instruction

INTRODUCTION

WARNING

CALIBRATION PROCEDURES

Equipment Required for Calibration

WBPEEUI110504A0

SECTION 4 - CALIBRATION

Explosionproof/dust-ignitionproof installations and intrinsi-
cally safe installations in Class II or Class III hazardous loca-
tions require that the assembly be kept tight while circuits are
live unless the location is known to be nonhazardous at the
time.
This section identifies the calibration status of the unit and
provides the calibration check procedures. Calibration and
validation procedures using both the Type STT terminal and
the EZ CAL option appear here.
If the standard configuration is ordered, the Type PTSD pres-
sure transmitter will be set close to a zero based full scale
span. A custom calibration can be factory supplied or imple-
mented in the field.
The Type PTSD pressure transmitter operates in either the
analog mode or the digital mode. Calibration procedures differ
depending on the selected mode of operation.
The analog mode of operation allows both a complete bench
calibration and a D/A adjustment. The D/A adjustment com-
pensates for slight inaccuracies in the four to 20-milliampere
current loop (or in receiving devices such as recorders). Use
this procedure only when the system has first been installed or
if something in the four to 20-milliampere current loop has
changed. The digital mode of operation allows only a bench
calibration.
NOTE: This section is meant as a generalized guide and does not
go through the step-by-step procedures required of the Type STT
terminal. Although the menus that appear on the Type STT terminal
display are easy to follow, consult the Type STT Smart Transmitter
Terminal Instruction while performing these procedures.
DC power supply, 24, ±1 VDC (recommended).
•
Digital multimeter (DMM) — 4-½ digit display minimum
•
with an accuracy at least four times greater than that of
the transmitter (Tables 1-5, 1-6, and 1-7).
250-ohm (±0.01-percent) resistor, ½-watt minimum.
•
INTRODUCTION
4 - 1