Dwyer GFM4 User Manual
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Command
Name
Totalizer
K Factors
Units
Maintenance
Timer
Full-Scale
Flow
Conditions
Read
Memory
Write
Memory
Description
Controls action of the flow totalizer.
Applies a gas correction factor to
the currently selected primary gas
calibration table.
(Note: does not work with % FS
engineering unit)
Sets the units of measure for the
flow signal and totalizer.
Note: The units of the totalizer
output are not per unit time.
Hours since last time unit was
calibrated
Returns the full-scale rated flow in
L/min. (Note: This term is not
multiplied by the current K factor)
Set STD or ACTUAL flow
conditions
Reads the value in the specified
memory location.
Write the specified value to the
specified memory location. Use
carefully, can cause unit to
malfunction.
No.
10
11
12
13
14
15
16
17
Command
T
K
U
C
E
FC
MR
MW
Argument 1
Z (reset to zero)
F (start totalizer at
flow & FS)
L (limit volume in
current E.U.)
D (stop the
totalizer)
E (run the
totalizer)
R (read the
totalizer)
S (setting status)
D(disable, sets
K=1)
I (internal K factor
table index)
U (user specified
factor)
S (status)
%(% full-scale)*
L/min
(liters per min.)
L/h
(liters per hr.)
mL/min
(mililiters per min)
mL/h
(mililiters per hr.)
CFH (cubic feet
per hour)
CFM (cubic feet
per min.)
LBPH (pounds per
min.)
UD (user defined)
S
current flow EU.
R (read timer)
C (set timer to
zero)
T - STD
A - ACTUAL
S - Status
0000 to 999
(table index)
0000 to 999
(table index)
Argument 3
S - seconds
M - minutes
H - hours
(time base)
Argument 4
Y - use density
N - do not use
density
Response
TZ
TF
TL
TD
TE
TS:M, Start, Limit
KD
KI
KU
K
U%
UL/min
UL/h
UmL/min
UmL/h
UCFH
UCFM
ULBPH
ULBPM
UUD
U
CC
FC STD
FC ACTUAL
FC STD
MWXXX
XXX = Table Index
Argument 2
(gas flow %FS)
(gas volume)
from internal
table [0-31]
correction factor)
(conversion factor
from SLPM)
UART Error Codes:
1 - Back Door is Not Enabled
2 - Wrong Number of Arguments
3 - Hardware for Requested Function is Not Installed (Not Available)
4 - Wrong Number of the Characters in the Argument
5 - Attempt to Alter Write Protected Area in the EEPROM
6 - Proper Command or Argument is not found
7 - Wrong Value of the Argument
8 - Wrong Command
9 - Reserved
10 - Argument Out of Range
11 - Auto ZERO in Progress
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