Universal
Non-Isolated 2-Wire Transmitters
Thermal Head Mounted
Series TH-11U |
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User selectable for all thermocouple
types, mV, and Pt-100 RTD.
The Mescon TH-11U is a low cost, non-isolated
temperature transmitter designed to fit in a
standard thermal head. A new design features a
unique circuitry that enables the use of a single
transmitter for the measurements of either Pt-100
RTD, Thermocouple input or mV. When set to
Thermocouple mode, the TH-11U accepts all known
Thermocouple types. The advantages
of using the TH-11U transmitter are:
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Reduced inventory
levels for
both in-plant users and distributors.
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Ease of
maintenance through
product standardization .
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Better
measurement stability through improved
circuitry and enhanced RFI-EMI rejection
.
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The TH-11U is constructed of an upper and
lower section. The lower section contains the
signal conditioning electronics, while the upper
half contains the "personality" components that
define the input sensor type and the
measurement range. The two halves snap into
each other for a perfect fit, yet enable easy
disassembly for the purpose of input and range
changes. |
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Specifications : |
| Output Span: |
4-20mA, limiting @
<28mA |
| Input: |
RTD - Pt-100, 2 or 3
wire connection 20°C minimum, 500°C maximum.
TC - all known types. 10mV min. span. |
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Input Span: |
RTD - 20°C min. 500°C max.
(36°F min. 900°F max.) |
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Burnout Detection: |
Upscale - standard. |
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Supply Voltage: |
8-38 VDC polarity protected. |
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Maximum Load: |
Rmax = (Vsupply - 8V)/20mA |
| Ambient
Temp.: |
-20°C to
+70°C |
| Humidity: |
0 - 95% RH,
Non-condensing |
| Linearity: |
RTD: better than
±0.05% of span
referred to sensor temperature.
TC/mV: better than ±0.03% of span
referred to mV input level. |
Stability:
(for both zero and span.) |
Pt-100 (100°C
span)0.03% of span/°C
TC/mV (25mV input): 0.04% of span/ °C |
| CJ Compensation: |
For TC - 0.05°C/°C of
ambient temp |
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All
specifications are subject to change
without notice. |
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Calibration
and adjustments:
It is assumed that the unit undergoing calibration
has been properly ranged at the factory or the
workshop.
1. Pt-100 RTD: Connect the Pt-100 sensor simulator
to the TH11 input terminals according to the wiring
diagram. Turn the power on OR
T/C: Connect the Thermocouple sensor simulator
to the TH-11 input terminals according to the wiring
diagram. Turn the power on. For optimum
performance allow 15 minutes for temperature
gradients to equalize.
2. Set the input to and adjust the ZERO pot until
the current indicator reads 4.00 mA.
3. Set the input to and adjust the SPAN pot until the
current indicator reads 20.00 mA.
4. Repeat steps 2 and 3 until no further adjustment
is needed.
Note: If the unit cannot be calibrated to the
desired range, it should be returned to the
workshop for proper ranging.
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