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6/08 ST 3000 Release 300 and SFC Model STS103 User’s Manual 189
10.4 Calibrating Range with SFC
Background
The ST 3000 Smart Transmitter has two-point calibration. This means
when you calibrate two points in the calibration range all the points in
that range adjust to that calibration.
Procedure
The procedure in Table 58 shows the steps for calibrating a differential
pressure (DP) type transmitter to a range of 0 to 200 inH
2
O for example
purposes. This procedure assumes that the transmitter is removed from
the process and located in a controlled environment.
ATTENTION
You must have a precision pressure source with an accuracy of 0.04% or
better to do a range calibration. Note that we factory calibrate ST 3000
Smart Transmitters with inches of water ranges using inches of water
pressure referenced to a temperature of 39.2 °F (4°C).
Table 58 Calibrating Measurement Range With SFC
Step Press Key Read Display or Action Description
1
Connect power supply and SFC to
signal terminals on transmitter’s terminal
block. Connect a calibration-standard
pressure source to high pressure side of
DP type transmitter.
See Figure 52 for typical SFC,
power supply, and pressure source
hookup for calibration.
2
Turn on power supply and allow
transmitter to stabilize its operation for
approximately 30 minutes.
3
Turn on SFC.
4
DE READ
A
ID
TA ON.G
?TRIPS SECURED?
Does not apply for bench calibration.
5
NON-VOL
ENTER
(Yes)
TA ON.G
SFC WORKING.. .
LIN AG NO.DP T
P T3Ø11
Acknowledge prompt and establish
communications with sample
transmitter PT 3011 to be calibrated.
6
Adjust pressure source to apply
pressure equal to LRV (0%)
7
E
LRV
0%
PTLRV 3Ø111
ØØØ
.
ØØ
"
H2O
_
39F
Present LRV setting. If displayed
value does not match applied
pressure, key in matching LRV
value or adjust pressure
accordingly.
8
RESET
K
COR-
RECT
PTLRV
L
3Ø11
T
1
RRRECO VC?
Prompt asks if LRV is to be
calibrated to applied reference
pressure. If it is to be calibrated, go
to next Step. If it isn’t, press [
CLR]
key and try again.
Continued on next page