Appendix; Sensor Input Accuracy; Recognition Of Sensor Failure Of Sensor Inputs; Sensor Characteristics - Honeywell CENTRA LINE MERLIN N Series Manual

APPENDIX

Sensor Input Accuracy

The controller's internal sensor inputs support both
NTC10K Ω and NTC20k Ω sensors. The following table lists
the typical minimum accuracies of the hardware and
software for these temperature sensors.
Table 17. Accuracies of internal NTC10k Ω and NTC20k
Ω sensor inputs of the controller
Measurement error (excluding
Range
-50 °C to -20 °C
≤ 5.0 K ≤ 5.0 K
(-58 °F to -4 °F)
-20 °C to 0 °C
≤ 1.0 K ≤ 1.0 K
(-4 °F to +32 °F)
0 °C to 30 °C
≤ 0.5 K ≤ 0.3 K
(32 °F to 86 °F)
30 °C to 70 °C
≤ 0.5 K ≤ 0.5 K
(86 °F to 158 °F)
70 °C to 100 °C
≤ 1.0 K ≤ 1.0 K
(158 °F to 212 °F)
100 °C to 130 °C
(212 °F to 266 °F) --
130 °C to 150 °C
(266 °F to 302 °F) --
150 °C to 400 °C
--
(302 °F to 752 °F)
(a
NTC10kΩ specified for -30 °C to +100 °C (-22 °F to 212 °F)
only.
(b
Johnson A99 specified for -40 °C to +120 °C (-40 °F to +248
°F) only.
(c
NI1000TK5000 specified for -30 °C to+130 °C (-22 °F to +266
°F) 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, such as
a connected Panel I/O module.
MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS

sensor characteristics)

≤ 1.2 K ≤ 1.2 K ≤ 1.2 K
≤ 0.7 K ≤ 0.7 K ≤ 0.7 K
≤ 0.5 K ≤ 0.5 K ≤ 0.5 K
≤ 0.7 K ≤ 0.7 K ≤ 0.7 K
≤ 1.2 K ≤ 1.2 K ≤ 1.2 K
≤ 3.0 K ≤ 1.2 K ≤ 1.2 K ≤ 1.2 K
≤ 5.5 K ≤ 1.2 K ≤ 1.2 K --
-- -- --
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 assume the safety
values configured in CARE.
internal NTC10k Ω and NTC20k Ω sensor inputs of the
controller," on page 29
the corresponding thresholds for the recognition of sensor
failure for the various different sensor types:
Table 18. Thresholds for short-circuit (SC) and sensor-
I/O configuration Measurement range Recognition thresholds
2 to 10 V
Ω
NTC10k (Type II)
Ω
NTC20k
PT1000
Ni1000TK5000
PT100
PT3000
10K3A1
Nickel Class B DIN
43760
sensors
--
JOHNSON A99
NOTE:
In the case of temperatures lying outside the afore-
mentioned ranges, the lowest/highest value within
the range, instead, will be communicated. Thus, a
temperature of -51 °F will be communicated as "-50
°F."
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.
29
Table 17, "Accuracies of
lists the measurement ranges and
break (SB) recognition
2to10 V / 4to20 mA SC: < 1.5 V / 3 mA;
(without pull-up) SB: no recognition
-30 °C to +100 °C SC: < 20
(-22 °F to +212 °F)
SB: < -94 °F (-70 °C)
-50 °C to +150 °C SC: < 20
(-58 °F to +302 °F)
SB: < -94 °F (-70 °C)
-50 °C to + 400 °C
SC: < 775
(-58 °F to +752 °F) SB: < -58 °F (-50 °C)
-30 °C to +130 °C SC: < 850
(-22 °F to +266 °F)
SB: < -58 °F (-30 °C)
-50 °C to +400 °C
-
(-58 °F to +752 °F)
-50 °C to +150 °C
-
(-58 °F to +302 °F)
-40 °C to +125 °C
-
(-40 °F to +257 °F)
-60 °C to +169 °C
-
(-76 °F to +752 °F)
-40 °C to +120 °C
-
(-40 °F to +248 °F)
EN1Z-1076GE51 R1021
Ω
;
Ω
;
Ω
;
Ω
;