Specifications

3. A
1
/
4
˝ female NPT
1
/
2
˝ male NPT pressure connection is fur-
nished to allow you the choice of vertical (from below the
gage) or horizontal piping. The unused port is plugged. When
changing the pressure connection from the vertical to the hor-
izontal position, use a minimal amount of thread sealant. Too
much could block the internal pressure passage. CAUTION:
When installing fittings or pipe always use a second wrench
on the
7
/
8
˝ connection block. DO NOT allow torque to be
transmitted from the block to the case.
ELECTRICAL CONNECTIONS
CAUTION: Do not exceed specified supply voltage ratings.
Permanent damage not covered by warranty will result.
This unit is not designed for 120 or 240 volt AC line opera-
tion.
Electrical connections to the Series 7116B Spirahelic
®
Pressure
Indicating Transmitter are made on the backside of the enclosure
unit. Feed stripped and tinned leads to the terminal block screws
marked 1 and 2. Refer to figure B for locations of the terminal
block, span and zero adjustments.
Wire Length - The maximum length of wire connecting transmit-
ter and receiver is a function of wire size and receiver resistance.
Wiring should not contribute to more than 10% of receiver resis-
tance to total loop resistance. For extremely long runs (over 1000
feet), choose receivers with higher resistances to minimize size and
cost of connecting leads. When the wiring length is under 100 feet,
lead wire as small as 22 AWG can be used.
2-Wire Operation - An external power supply delivering 10-35
VDC with minimum current capability of 40 mA DC (per transmit-
ter) must be used to power the control loop. See Fig. C for con-
nection of the power supply, transmitter, and receiver. The range
of the appropriate receiver load resistance (RL) for the DC power
supply voltage available is expressed by the formula and graph in
Fig. D. Shielded two wire cable is recommended for control loop
wiring. If grounding is required use negative side of control loop
after receiver. See Fig. C.
Pneumatic Calibration Test
Use a dead weight tester or certified test gage having accuracy of
1/4% or better for ANSI Grade A gages, 0.1% or better for ANSI
Grade 2A gages. The test gage range should be comparable to
the range of the Series 7116B Spirahelic
®
Pressure Indicating
Transmitter gage being checked. Connect lines from the two
instruments to a tee and the third line from the tee to a controllable
source of pressure. Apply pressure slowly so that the pressure
equalizes throughout the system, compare readings. If the gage
being tested is found to need calibration return it to the address on
page 3.
ZERO ADJUST
TERMINAL BLOCK
SPAN ADJUS
T
MAXIMUM VALUE (1250 OHMS)
OPERATING
REGION
RECEIVER RESISTANCE (OHMS)
0
5
10
15
20 25 30
35
40
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
50
7116B SERIES
INDICATING
PRESSURE
TRANSMITTER
RECEIVER
POWER
SUPPLY
10-35 VDC
mA
+
+
__
_
+
Fig. C
2-WIRE CONNECTION
Fig. D
POWER SUPPLY VOLTAGE - VDC (2-WIRE CONNECTION)
Fig. B
E-105 9/11/03 8:13 AM Page 2