Daytronic 10A18-4C Bedienungsanleitung

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1GENERALDESCRIPTIONANDSPECIFICATIONS

The Model 10A18-4C is a high-bandwidth conditioner card designed for temperature

measurement using 100-Ωplatinum

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).

ADDITIONAL10A18-4C 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 RTDstandard

(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 resolutionwill, 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).

GENERALDESCRIPTIONANDSPECIFICATIONS10A18-4C.1

SYSTEM10

ANALOGINPUTCARDS

1.E.2.10A18-4C

MODEL10A18-4C

QUAD100-ΩPLATINUMLINEARRTD

C

ONDITIONERCARD

Produktspezifikationen