Sensor Input Accuracy; Recognition Of Sensor Failure Of Sensor Inputs; Sensor Characteristics; Appendix 2 - Honeywell CENTRA LINE EAGLEHAWK NX Installation & Commissioning Instructions

EAGLEHAWK NX CONTROLLER – INSTALLATION & COMMISSIONING INSTRUCTIONS

APPENDIX 2

Sensor Input Accuracy

The internal sensor inputs of the EAGLEHAWK NX controller support both NTC10kΩ and NTC20kΩ sensors (see also section
"Universal Inputs" on page 26). The following table lists the typical minimum accuracies of the hardware and software for
temperature sensors.
Table 33. Accuracies of internal NTC20kΩ sensor inputs of the EAGLEHAWK NX
-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 COACH
NX. Table 34 lists the measurement ranges and the corresponding thresholds for the recognition of sensor failure for the various
different sensor types:
Table 34. Thresholds for short-circuit (SC) and sensor-break (SB) recognition
I/O configuration
2...10 V
NTC10kΩ
NTC20kΩ
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.
range
measurement range
2...10 V / 4...20 mA (without pull-up)
-30 ... +100 °C
-50 ... +150 °C
measurement error (excl. sensor characteristics)
(1
NTC10kΩ sensors
≤ 5.0 K
≤ 1.0 K
≤ 0.5 K
≤ 0.5 K
≤ 1.0 K
--
--
--
SC: < 1.5 V / 3 mA; SB: no recognition
SC: < 20 Ω; SB: < -70 °C
SC: < 20 Ω; SB: < -70 °C
53
NTC20kΩ sensors
≤ 5.0 K
≤ 1.0 K
≤ 0.3 K
≤ 0.5 K
≤ 1.0 K
≤ 3.0 K
≤ 5.5 K
--
recognition thresholds
EN1Z-1039GE51 R1218