August 2020
Reference Manual
L231040 Rev AD
10
The following below is the Hart Topology.
Section 4: Specifications
4.0 Transmitter Electrical Specifications
Supply Voltage:
16 to 36 VDC
Resolution:
0.039 in (1mm)
Repeatability:
.005% of full scale or .010”
whichever is greater
Non-Linearity:
.01% of full scale or .030”,
whichever is greater
Level Sensor Accuracy:
.01% of full scale or .020”,
whichever is greater
Analog Output Resolution:
.025% of full scale, (1) 4/20 mA
Primary level
Output:
One 4-20 mA output
Calibration:
Zero and span field adjustable
with pushbuttons
Dampening:
1 to 26 seconds (field
adjustable) via push-buttons
Operating Temperature:
(Electronics)
-58 to 185 °F (-50 to 85 °C)
Housing:
Explosion Proof, Dual
Compartment, 1/2” npt, Epoxy
Coated Aluminum (Standard)
Explosion Proof, Dual
Compartment, 1/2” npt,
Stainless Steel (Model LTM-351
only)
Hazardous Location Approvals:
FM – Exp Cl I, Div. I Grp. BCD, Cl
II, Grp. EFG, Cl III
CSA – Exp Cl I, Div. I Grp. BCD,
Cl II, Grp. EFG, Cl III
IECEx – Exp Ex d IIC T5
Humidity Limits:
SAMA PMC 31.1-5.2
Vibration Limits:
SAMA PMC 31.1-5.3
RFI Limits:
SAMA PMC 31.1-20 to 1000
MHz up to 30V/m
4.1 Transmitter Sensor Tube
Material:
316ss standard, optional
Hastelloy, Monel, Kynar-coated
Operating Temperature:
-50 to 302 °F (-50 to 150 °C)
Maximum Pressure:
2000 psig @ 300 °F
Range:
16 inches up to 30 feet
Section 5: Menu Structure and Features
5.0 Pushbutton Operation
The menu structure and pushbutton operation of the LTM
series transmitters is simple and user-friendly. The
electronics module has 3 pushbuttons (from left to right):
This button is used to increment values and change “Yes” to
“No” and “No” to “Yes”.
This button is used to decrement values and change “Yes” to
“No” and “No” to “Yes”.
This is the enter button used to execute functions and
enter/exit into or out of submenus.
Please visit www.hartcomm2.org to learn more about
HART Protocol.
