704-5010-131 Datasheet, PDF (6/12 Pages) Magnetrol International, Inc. – Horizon™ Model 704 Guided Wave Radar Level Transmitter

TWIN ROD PROBE
Recommended for
7XB Twin Rod-Rigid
General purpose, foam, minor film coating
Not recommended for
Materials/Wetted parts
Media bridging between rods
or building up on spacers
316L stainless steel, TFE, Viton^® GFLT
Process seal
Optional
Hastelloy C, Monel
Viton^® GFLT O-ring Œ
Spacers
TFE
Diameter
Process connection thread
Two, ∅ .50" (13 mm) rod;
.875" (22 mm) C_L to C_L
2" NPT, 2" BSP
Flange ANSI (DIN)
2" to 4" (DN50 to 100)
Length
Transition zone 
Deadband
Top
Bottom
Top
24 to 192 inches (60 to 488 cm)
1" (25 mm) @ ε_r > 10, 8" (200 mm) @ ε_r < 10
(+4" (100 mm) inactive)
6" (150 mm) @ ε_r = 2.5
1" (25 mm) @ ε_r = 80
4"(+4" inactive section)
Process temperature Ž
Maximum
+400° F @ 200 psig (+200° C @ 13 bar)
Minimum/cryogenic
-40° F @ 750 psig (-40° C @ 50 bar)
Process pressure
Maximum
750 psig @ +70° F (50 bar @ +20° C)
Minimum/vacuum service
Yes, not hermetic
Dielectric range
≥ 2.5
Maximum viscosity (cP)
1500
Mounting effects 
Active rod > 1" from any obstruction
Coating/Buildup 
Film: 3% max. error of coated length with conductive media
Bridging not recommended
Foam
Yes
Corrosives
Yes
Hygienic
No
Overfill
No
Approvals
FM
Yes
CSA
Yes
ATEX
Yes
OTHER
No
ΠRefer to Selection Chart on page 7 for optional O-rings.
 Transition Zone is dielectric dependent: ε_r = dielectric permittivity.
Unit will function but accuracy will decrease in Transition Zone.
NOTE: Output may go to Fault mode when medium is within top 7 inches of probe and ε_r <20.
Ž Refer to Ambient Temperature vs. Process Temperature graph on page 8.
 Minimum stillwell diameter for Twin Rod probe is 3 inch (80 mm).
 Bridging is defined as continuous accumulation of material between the probe elements.
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