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26
Prelim Draft - Brand Neutral
BACnet IP/MSTP VAV Controller - INSTALLATION
INSTRUCTION
NOTE:
NOTE:
NOTE:
This is the accuracy of the internal sensor input
(ha software [linearization]), only. This
table does not include the characteristics of the
sensors, themselves (see section “Sensor Char-
acteristics below). If a different sensor or sensor
accuracy is required, one may instead use the
inputs of, such as a connected Panel I/O mod-
ule.
NOTE:
In the case of temperatures lying outside the
aforementioned ranges, the lowest/highest value
within the range, instead, will be commu- nicated.
Thus, a temperature of -51 °F will be communicated
as “-50 °F.”
APPENDIX
Sensor Input Accuracy
The controller's internal sensor inputs support both
NTC10K
Ω
and NTC20 k
Ω
sensors. The following table lists the
typical minimum accuracies of the hardware and software for
these temperature sensors.
Table 15.
Accuracies of internal NTC10k
Ω
and NTC20k
Ω
sensor inputs of the controller
Range
Measurement error (excluding
sensor characteristics)
N
TC10k
Ω
(a
N
TC20k
Joh
n
so
n
A
99
(b
PT3000
N
I1000T
K5000
(b
-58 to -4 °F
(-50 to -20 °C)
≤ 5.0 K
≤ 5.0 K
≤ 1.2 K ≤ 1.2 K
≤ 1.2 K
-4 to +32 °F (-
20 to 0 °C)
≤ 1.0 K
≤ 1.0 K
≤ 0.7 K ≤ 0.7 K
≤ 0.7 K
32 to 86 °F (0
to 30 °C)
≤ 0.5 K
≤ 0.3 K
≤ 0.5 K ≤ 0.5 K
≤ 0.5 K
86 to 158 °F
(30 to 70 °C)
≤ 0.5 K
≤ 0.5 K
≤ 0.7 K ≤ 0.7 K
≤ 0.7 K
158 to 212 °F
(70 to 100 °C)
≤ 1.0 K
≤ 1.0 K
≤ 1.2 K ≤ 1.2 K
≤ 1.2 K
212 to 266 °F
(100 to 130 °C)
--
≤ 3.0 K
≤ 1.2 K ≤ 1.2 K
≤ 1.2 K
266 to 302 °F
(130 to 150 °C)
--
≤ 5.5 K
≤ 1.2 K ≤ 1.2 K
--
302 to 752 °F
(150 to 400 °C)
--
--
--
--
--
(a
NTC10k
Ω
specified for -22 to 212 °F (-30 to +100 °C)
only.
(b
Johnson A99 specified for -40 to +248 °F (-40 to +120
°C) only.
(c
NI1000TK5000 specified for -22 to +266 °F (-30…+130
°C) only.
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.
lists the measurement
ranges and the corresponding thresholds for the recognition
of sensor failure for the various different sensor types:
Table 16. Thresholds for short-circuit (SC) and sensor- break (SB)
recognition
I/O
configuration
Measurement
range
Recognition
thresholds
2to10 V
2to10 V / 4to20 mA
(without pull- up)
SC: < 1.5 V / 3 mA;
SB: no recognition
NTC10k
Ω
(Type II) -22 to +212 °F (-30
to +100 °C)
SC: < 20
Ω
;
SB: < -94 °F (-70 °C)
NTC20k
Ω
-58 to +302 °F (-50
to +150 °C)
SC: < 20
Ω
;
SB: < -94 °F (-70 °C)
PT1000
-58 to +752 °F (-50
to + 400 °C)
SC: < 775
Ω
;
SB: < -58 °F (-50 °C)
Ni1000TK5000
-22 to +266 °F (-30
to +130 °C)
SC: < 850
Ω
;
SB: < -58 °F (-30 °C)
PT100
-58 to +752 °F (-50
to +400 °C)
Inputs required
PT3000
-58 to +302 °F (-50
to +150 °C)
Inputs required
10K3A1
-40 to +257 °F (-40
to +125 °C)
Inputs required
Nickel Class B
DIN 43760
sensors
-76 to +752 °F (-60
to +169 °C)
Inputs required
JOHNSON A99
-40 to +248 °F (-40
to +120 °C)
Inputs required
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.
