Daytronic 10A18-4C Bedienungsanleitung
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10A18-4C
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
The Model 10A18-4C is a high-bandwidth conditioner card designed for temperature
measurement using 100-Ω platinum
Resistance Temperature Detectors (RTD's) of
either DIN (European) or American design.* It produces an output voltage that is lin-
early related to actual temperature instead of resistance—with selectable accuracy
(depending on the operating measurement range) of up to ±0.2° C (see Fig. 1). Since
the 10A18-4C provides its own per-channel temperature curve fitting,
no further sys-
tem-level linearization is required
.
Precision constant-current excitation is provided for four independent sensor chan-
nels, which may be intermixed as required. RTD inputs are normally set for four-wire
cabling, with nominal excitation of one milliampere and input impedance exceeding
10 MΩ, to eliminate common self-heating and cable-loading errors. However, for an
RTD channel with a shared “+SIGNAL” and “+CURRENT” line, three-wire mode is avail-
able, if desired, via an internal jumper setting (as explained in Section 3.a, below).
ADDITIONAL 10A18-4C SPECIFICATIONS
RTD Types: Platinum; DIN (European) or American standard with “ice-point” of 100
ohms
(ONLY)
Linear Range and Accuracy: -200.0° C to +600.0° C full-scale for each RTD standard
(DIN and American); accuracy of linearization will depend on the selected RTD stan-
dard and the selected operating range (see Fig. 1, which shows
worst-case error
that could occur for a 10A18-4C card operating at an ambient temperature of 25° ±
10° C, six months after calibration
)**; automatically selected—on an individual chan-
nel basis—when the channel is configured; System 10 channel “type” codes
assigned to 10A18-4C data channels are given in Table 2, Section 3.b, below
Excitation (per channel): Nominal 1 mA
Amplifier (per channel): Low-drift, linearized by current feedback
Normal-Mode Range: ±350 mV operating; ±5 V without instrument damage
(cont’d)
*For the 10A18-4C, “American” standard conforms to NIST “Reference Function.”
** With proper calibration, each operating range can be expressed, if desired, in
degrees Fahren-
heit
(see Section 3.b). Note that the expected linearity deviation for most temperature mea-
surements within the 10A18-4C’s full -200° C to +600° C range are
substantially less than the
maximum error values given in Fig. 1. More detailed information is available on request from
the Daytronic factory, if error reduction below the limits shown in Fig. 1 is desired. Note also
that, while measurement accuracy is independent of the system using the 10A18-4C card, final
measurement resolution will, in general, depend on the system. In System 10, the resolution is
limited by the readout to a maximum resolution of approximately one part in 30,000 (e.g.,
±0.01° C for measurements up to 300° C).
GENERAL DESCRIPTION AND SPECIFICATIONS 10A18-4C.1
SYSTEM 10
ANALOG INPUT CARDS
1.E.2.10A18-4C
MODEL 10A18-4C
QUAD 100-Ω PLATINUM LINEAR RTD
C
ONDITIONER CARD
Common-Mode Range (expressed as lead-wire resistance rejection,
100 Ω maximum):
0.004%/Ω (4-wire)
Input Impedance (Differential): Greater than 10 MΩ
Offset: Initial: ±5 µV; vs. Temperature: ±0.2 µV/°C; vs. Time: ±1 µV/month
Gain Accuracy: ±0.02% of full scale
Gain Stability: vs. Temperature: ±25 ppm/°C; vs. Time: ±20 ppm/month
Filter (per channel): 3-pole modified Butterworth; 3 dB down at 10 Hz; 60 dB down at
190 Hz
Step-Response Settling Time (Full-Scale Output):
To 1% of final value: 65 msec
To 0.1% of final value: 85 msec
To 0.02% of final value: 100 msec
10A18-4C.2 GENERAL DESCRIPTION AND SPECIFICATIONS
Max. Error for
–200.0° C to
+600.0° C:
±1.0° C
Max. Error for
–180.0° C to
+520.0° C:
±0.4° C
–200° C –100° C 0° C +100° C +200° C +300° C +400° C +500° C +600° C
+0.2° C
+0.4° C
+0.6° C
+0.8° C
+1.0° C
–1.0° C
–0.8° C
–0.6° C
–0.4° C
–0.2° C
–200.0° C to +600.0° C
Max. Error for
–40.00° C to
+300.00° C:
±0.2° C
Range
Accuracy
–180.0° C to +520.0° C
–40.00° C to +300.00° C
–200° C –100° C 0° C +100° C +200° C +300° C +400° C +500° C +600° C
+0.2° C
+0.4° C
+0.6° C
+0.8° C
+1.0° C
–1.0° C
–0.8° C
–0.6° C
–0.4° C
–0.2° C
–200.0° C to +600.0° C
Max. Error for
–40.00° C to
+300.00° C:
±0.2° C
Range
Accuracy
–70.0° C to +450.0° C
–40.00° C to +300.00° C
Max. Error for
–70.0° C to
+450.0° C:
±0.4° C
Max. Error for
–200.0° C to
+600.0° C:
±0.6° C
Fig. 1 Range-Dependent Accuracy of the Model 10A18-4C
Fig. 1(a) For DIN Standard Platinum RTD’s (
αα
= 0.00385)
Fig. 1(b) For American Standard Platinum RTD’s (
αα
= 0.00392)
10A18-4C QUAD PLATINUM LINEAR RTD CARD
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | 10A18-4C |
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