Fluid Components International MT86_MT86HT Manual General Information - Manual (Page 2)

FLUID COMPONENTS INTL CHAPTER 1 - GENERAL INFORMATION
Models HT86, HT86HT 1 - 2 Doc. No. 003162 Rev. F
Flow Transmitter
The flow transmitter measures the voltage differential ( D V) produced by the temperature differential ( D T) between
the active and reference RTDs for each individual sensing point. The flow transmitter amplifies the D V signal and
converts it into a signal that is temperature compensated and linearized. The linearized signals from the sensing
points are then averaged together and converted into the final output signal (4-20 mA, 0-5 Vdc, 0-10 Vdc, etc.) as
specified by the customer.
The flow transmitter has a diagnostic alarm. If a problem exists with a sensing point, a Light-Emitting-Diode (LED)
on the control board will flash to notify the customer.
Technical Specifications
• Process connection
2 inch male NPT or 2 inch 150 lb. raised-face
carbon steel flange.
• Number of sensing points
Up to and including 8 sensing points.
• Insertion length
The duct dimensions at the measurement site
determine the insertion U-Length.
• Material of construction
All wetted parts are 316 stainless steel with nickel-
braze, per MIL-B-7883 using AMS 4777
• Local enclosure (flow element
terminal strip enclosure)
NEMA 4 enclosure with 1 inch female NPT
connection ports.
• Operating pressure
Standard MT86 is 0-50 PSIG or higher on
application.
• Operating temperature
Standard flow element: -50 to 350°F (-46 to
177°C).
High temperature (HT) element: -50 to 850°F
(-46 to 454°C).
Flow transmitter: 0 to +150°F (-18 to 66°C) with
LCD or -50 to 150°F (-46 to 66°C) without LCD.
• Flow range
0.25 to 150 fps in gas under standard conditions
(14.7 PSIA @ 70°F).
• Flow element assemblies
May have 1, 2, 3 or 4 separate flow element
assemblies. Must contain a minimum of 2 sensing
points per flow element.
• Remote enclosure (flow transmitter
control circuit enclosure)
NEMA 4 enclosure with 1 inch female NPT
connection ports.
• Input power
Standard 100-130 Vac or 200-270 Vac, 50/60 Hz,
50 watt maximum. Optional 24 Vdc, 50 watt max.
• Output signal
4-20 mA current loop capable of driving a 1000
ohm load. Optional:
10-50 mA, 400 ohm load max.
0-5 Vdc, 2 mA current max.
1-5 Vdc, 2 mA current max.
0-10 Vdc, 2 mA current max.
• Interconnecting cable
24 AWG (min.) 8-conductor shielded cable with
PVC insulation (100 feet maximum). Longer
distances are possible using a heavier gauge wire
for the heater circuit (see Table 2-1).
• Turn down ratio
2:1 to 100:1 within flow element range customer
specified.
• Accuracy
± 3% of full scale at the temperature of calibration;
±5% of full scale with temperature compensation
over a range spanning 200°F. Manufacturer
determines the accuracy for specific duct
configurations upon submittal of a fully completed
Multipoint Mass Flowmeter Application Data
Sheet.
• Repeatability
± 1% of full scale.
• Approvals
F.M., C.S.A., and CENELEC approvals are
available for all MT Series Multipoint Mass
Flowmeters.