TM_ELF-D_R1F
9
ELF - E
LECTRONIC
L
OW
F
LOW
A
IRFLOW
/T
EMPERATURE
M
EASUREMENT
ELF
DUAL ANALOG OUTPUT
/D
SERIES
EBTRON
, Inc. 1663 Hwy. 701 S., Loris SC 29569
•
Toll Free: 800.2
EBTRON
(232.8766)
•
Fax: 843.756.1838
•
Internet:
EBTRON
.com
ELF/D Analog Output Connections
The ELF/D provides analog outputs corresponding to airflow or equivalent velocity pressure and temperature. Analog
outputs available from the ELF/D00 and /D03 versions are 0-10/2-10 VDC; or 0-5/1-5 VDC from the /D01 and /D04
versions. The /D02 version provides an equivalent Staefa output. Outputs are capable of driving 20mA loads. The
analog outputs are not isolated from the input power. The 24VAC input ground is shared with the analog signal ground
(black wire - GND). If isolated outputs are desired, the ELF must be powered by a dedicated isolation transformer.
Connect the analog airflow output (white wire), temperature output (green wire) and the signal common (black wire) to
the BAS monitor/control interface using shielded twisted pair cable as shown in Figure 5.
Converting the ELF/D Analog Output from 2-10VDC or 1-5VDC to an equivalent 4-20mA output
(Not for Staefa output model with /D02 suffix)
Analog output voltage can be converted to equivalent analog output current by setting the ELF analog output switch
SW2 to 2-10VDC for the ELF/D00 and /D03 versions (or 1-5VDC for the /D01 and /D04 versions), and placing the
proper value of resistor R1 across the ELF analog output signal lines at the BAS control interface as shown in Figure 5.
For example, on an ELF/D00 (0-10VDC), set SW2 set for 2-10VDC (ON), and use an R1 value of 500 ohms at the BAS
control input interface to produce a corresponding control signal of 4-20mA. Similarly, for an ELF-xxxx/D01 or /D04
version (0-5VDC), set SW2 for 1-5VDC output, and R1 value of 250 ohms to produce a 4-20 mA control signal.
Figure 5. ELF/D Power and Signal Wiring Interconnections
TEM
P
FLO
W
G
ND
24
V
JUNCTION BOX
EBTRON ELF
24 VAC POWER INPUT
(SEE NOTE *1)
24 VAC COM / SIGNAL COM
ANALOG AIRFLOW OUT
RED
BLACK
WHITE
24 VAC
TRANSFORMER
(SEE NOTE *1)
RED
BL
AC
K
WHIT
E
4-CONDUCTOR
SHIELDED CABLE (3 FEET)
INCLUDED WITH ELF
(SEE NOTE *2)
*
NOTES:
*1: THE 24 VAC COMMON AND ELF ANALOG OUTPUT SIGNAL COMMON ARE SHARED.
THEREFORE, ON MULTIPLE ELF INSTALLATIONS ENSURE THAT ALL TRANSMITTERS ARE
WIRED TO THE SAME TERMINALS ON THE 24 VAC POWER SOURCE.
*2: CONNECT CABLE DRAINS TO EARTH GROUND AT ONE END OF EACH CABLE ONLY.
*3: FOR ELF STANDARD AND MODELS WITH /D01, /D03 and /D04 SUFFIX (NOT FOR /D02) UNIVERSAL INPUT
CONTROLLER APPLICATIONS WITH PULL-UP RESISTORS, RESISTOR R1 MUST BE CONNECTED ACROSS THE
CONTROLLER’S ANALOG INPUTS AS SHOWN. SELECT R1 VALUE AS FOLLOWS:
FOR STANDARD ELF AND /D03 VERSIONS, SET SW2 ON (FOR 2-10VDC OUTPUT), AND SELECT R1=500 OHMS.
FOR ELF /D01 AND /D04 VERSIONS, SET SW2 ON (FOR 1-5VDC OUTPUT) AND SELECT R1=250 OHMS.
*
2
*
2
*
2
*
1
ANALOG TEMPERATURE OUT
GREEN
GREEN
(BLACK)
(WHITE)
OR
(GREEN)
+10 VDC
25 K-OHM
200 K-OHM
R1
(SEE NOTE *3)
¼ W MIN
TYPICAL
“UNIVERSAL INPUT “
CONTROLLER CIRCUIT
ALTERNATE WIRING FOR
UNIVERSAL INPUT CONTROLLER
APPLICATION (SEE NOTE *3)
NOT FOR USE WITH ELF MODEL
/D02 WITH STAEFA OUTPUT
SELECT R1 VALUE
AND CONFIGURE
SW2 AS DETAILED
IN NOTE *3.
*
2
TYPICAL
ANALOG INPUT
BAS
2 CONDUCTOR
TWISTED PAIR
SHIELDED CABLE
SUPPLIED BY OTHERS
(BLACK) ANALOG COMMON
(WHITE) AIRFLOW OUT
(GREEN) TEMPERATURE OUT
*
2