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Sensor Characteristics - Honeywell CENTRA LINE MERLIN NX Series Installation & Commissioning Instructions

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MERLIN NX ROOM CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS
APPENDIX: SENSOR CHARACTERISTICS
Sensor Input Accuracy
The controller's internal sensor inputs support NTC10kΩ and NTC20kΩ sensors. The following table lists the typical minimum
accuracies of the hardware and software for these temperature sensors.
Table 14. Accuracies of internal NTC10kΩ and NTC20kΩ sensor inputs of the Excel Web II
range
-50 ... -20 °C (-58 ... -4 °F)
-20 ... 0 °C (-4 ... +32 °F)
0 ... 30 °C (32 ... 86 °F)
30 ... 70 °C (86 ... 158 °F)
70 ... 100 °C (158 ... 212 °F)
100 ... 130 °C (212 ... 266 °F)
130 ... 150 °C (266 ... 302 °F)
150 ... 400 °C (302 ... 752 °F)
(1
NTC10kΩ specified for -30 ... +100 °C, only.
NOTE: This is the accuracy of the internal sensor input (hardware + software [linearization]), only. This table does not include
the characteristics of the sensors, themselves (see section "Sensor Characteristics" below). If a different sensor or
sensor accuracy is required, one may instead use the inputs of, e.g., a connected Panel I/O module.
Recognition of Sensor Failure of Sensor Inputs
The thresholds at which sensor failures – i.e., sensor breaks (SB) and short-circuits (SC) – are recognized depends upon the
given sensor type. In the event of a recognized sensor failure, the sensor inputs assume the safety values configured in CARE.
Table 15 lists the measurement ranges and the corresponding thresholds for the recognition of sensor failure for the various
different sensor types:
Table 15. Thresholds for short-circuit (SC) and sensor-break (SB) recognition
I/O configuration
2...10 V
NTC10kΩ
NTC20kΩ
PT1000
Ni1000TK5000
NOTE: In the case of temperatures lying outside the aforementioned ranges, the lowest/highest value within the range,
instead, will be communicated. Thus a temperature of -51 °C will be communicated as "-50 °C."

Sensor Characteristics

The characteristics (resistance in relation to temperature) of the sensors and the resultant voltage are listed on the following
pages. The stated values do not include failures due to: sensor failures; wiring resistance or wiring failures; misreadings due to a
meter connected to measure resistance or voltage at the input.
EN1Z-1035GE51 R0420
measurement error (excluding sensor characteristics)
(1
NTC10kΩ
≤ 5.0 K
≤ 1.0 K
≤ 0.5 K
≤ 0.5 K
≤ 1.0 K
--
--
--
measurement range
2...10 V / 4...20 mA (without pull-up)
-50 ... +100 °C
-50 ... +150 °C
-30 ... + 400 °C
-70 ... +130 °C
28
NTC20kΩ
≤ 5.0 K
≤ 1.0 K
≤ 0.3 K
≤ 0.5 K
≤ 1.0 K
≤ 3.0 K
≤ 5.5 K
--
recognition thresholds
SC: < 1.5 V / 3 mA; SB: no recognition
SC: < 20 Ω; SB: < -70 °C
SC: < 20 Ω; SB: < -70 °C
SC: < 775 Ω; SB: < -50 °C
SC: < 850 Ω; SB: < -30 °C

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